传感器物理研发实验室的调试指南

原文

A practitioner's guide based on experience setting up and operating sensor development and characterisation labs at CERN, LBNL, DESY, and the University of Bergen.

Author: Magne Lauritzen

Contact: [email protected]

The majority of this guide applies to any lab doing experimental physics, electronics development, or instrumentation work. Sensor-specific sections are clearly marked.

The guide covers equipment, infrastructure, and services. It does not cover lab procedures such as safety training, procurement workflows, or inventory management. Those deserve their own treatment.

On brand recommendations: Specific brands and models are cited throughout based on direct experience. These are genuine recommendations, not sponsorships. Alternatives exist in most categories. When in doubt, search for comparisons on EEVblog forums or Reddit r/ECE. Prices and availability change; verify before purchasing.

On links: Links were correct at time of writing. If one is broken, a web search for the product or term will find it quickly.

This is a significant capital project

A proper R&D lab cannot be accommodated in a standard office environment. It requires purpose-built or significantly adapted space with dedicated electrical, gas/vacuum, ventilation, and network infrastructure. Identifying and securing suitable space is a prerequisite! Do not buy equipment before you have a space.

The facility is structured as three distinct areas:

Main lab space : Experimental workstations, measurement instruments, environmental test infrastructure, and services
Mechanical workshop : Cable assembly, enclosure fabrication, 3D printing, and laser cutting. Must be physically separate from the lab.
PCB / PCBA area : Soldering workstations, PCB milling, and inspection. Can share the main lab space if the layout permits.

Space	Min. floor area	Key infrastructure
Main lab	30 m²	Dedicated circuits, UPS, gas/vacuum/water services, managed LAN, ESD flooring, heavy-duty benches, A/C with thermal headroom.
Mechanical workshop	20 m²	Dust isolation from lab, extraction ventilation, separate entrance preferred
PCB / PCBA area	10 m² (can share main lab)	Fume extraction at every station, ESD throughout, good lighting. Space requirement depends on number of workstations required.
Chemistry lab (optional)	20 m²	Fume hoods, chemical storage, dedicated waste disposal, separate ventilation

Not everything needs to be purchased on day one. A rough priority order:

Phase 1 (before any work begins): Infrastructure (power, network, UPS, ventilation), basic bench equipment (PSUs, DMMs, oscilloscopes), ESD protection, safety equipment
Phase 2 (once projects are defined): Signal conditioning instruments, DAQ systems, environmental chamber, PCB prototyping equipment
Phase 3 (project-specific): RF equipment, optical/photonic gear, chemistry equipment, high-end instruments

1. General Lab Infrastructure

Infrastructure is the foundation of everything else. If you skimp here, you will have persistent productivity losses that compound daily. These items should be in place before any equipment is installed. Most cannot be easily retrofitted, as I have experienced first-hand. The quality of your infrastructure sets the boundaries of what your lab can do.

Services

Run these to all areas of the lab from day one:

Dry, cleaned pressurised air (requires oil-free compressor, desiccant dryer, particulate filter, activated carbon filter)
Nitrogen (for purging, drying, and humidity-sensitive work)
Vacuum line
Coolant water supply and return line
Several additional lines (3+) for future gases

Gas and liquid services are as important as electrical power. Use standard fittings that allow for fitting of equipment, port, or extensions.

Power

Dedicated circuits for high-draw equipment (environmental chambers, high-power PSUs)
Uninterruptible Power Supply (UPS) for the entire lab. Transient events on the mains can destroy sensitive sensors and corrupt long-running measurements.

Network

Managed lab-wide LAN for instrument interconnectivity. Most modern lab instruments support LXI/VXI-11 over Ethernet or GPIB. A managed switch with VLANs keeps lab traffic isolated.

Workstations

Dedicated Linux desktops at each workstation. Screen on a retractable arm, keyboard and mouse hidable when not in use, miniature PC mounted behind the screen. The goal is to preserve bench space, the scarcest resource in any lab.

Environment

Good ventilation and dust management. A full cleanroom is overkill for most R&D, but air filters on the ventilation inlets are a minimum requirement.
Air conditioning with sufficient thermal headroom. A fully equipped lab generates substantial heat. I had persistent problems with overheating in a previous lab that was undersized for A/C. Nice and cozy during winter, but an oven during summer.
ESD-safe flooring throughout, not just individual bench mats.
Humidity-controlled storage cabinet: A cupboard kept slightly overpressured with dry air or nitrogen.

Organisation

Inventory and asset management system. An Excel sheet is fine to start. The key requirement is that it is easy to update. Train every users in this system. Label every equipment clearly. Create a mandatory check-out procedure so that there is never a question about who's using what equipment, where it is, and what experiment or project it is supporting.
Storage room for unused equipment. Unused equipment must be out of sight and not take up scarce bench space. Keep work areas tidy.
Unified cable and equipment labelling system. Lack of this will kill productivity faster than almost anything else. Label everything. Get a label printer and add labels with basic info on equipment: Manufacturer, model name, core specifications, intended use. On expensive equipment, you can also specify if it requires training, who is responsible for the device, and what it costs.
User manuals. Keep printed, physical copies of user manuals for all devices in your lab. Make sure everyone knows where to find them.

Cables and connectors

Keep a stock of:

BNC, SMA, LEMO coax in various lengths — label all cables with propagation delay
Coax adapters, T-splitters, 50 Ω terminators and attenuators
Flexible power cables in various lengths and colours with banana plug connectors

CO₂ fire extinguishers — Use CO₂, not water or foam, for electronics fires. You may need specialized fire extinguishers in the chemical lab (if you have one)
Safety cabinets — Required wherever solvents (IPA, acetone, ethanol) are stored in quantity. These are fire-rated enclosures, not ordinary cupboards.
First aid station — Stocked and clearly signed.
Radioactive sources — If working with radioactive calibration sources, these require a dedicated safe, a designated safety officer, written procedures, and in most jurisdictions a formal radiation protection program. Do not improvise this.

3. General Workbench Equipment

A well-equipped bench is the foundation of productive work. Skimping here creates daily friction.

Power supplies (PSU)

I use Aim-TTI exclusively for bench PSUs. The programming interface is consistent across their range, LAN/GPIB support is excellent, and they cover every power requirement in a typical lab. Specific models:

General purpose: QL564P — reliable workhorse. Even the smallest lab should have at least two
Low noise: QL564TP(G) — essential for powering sensitive front-ends and analog circuitry where PSU noise couples into measurements
High power: QPX1200SP — for Peltier coolers, heaters, electromagnets
Intermediate voltage: PLH250-P(G) — more general-purpose than a Keithley SMU and higher power; SMUs are precision instruments, not power supplies (see Section 3)

Digital multimeter (DMM)

One per bench. The Keithley 2100 is a solid choice with good software support.

Oscilloscope

One per bench. See chapter 4 on signal acquisition. Each bench will need one general-purpose oscilloscope with passive probes (<250MHz).

4. Microscopy & Inspection

In addition to the stereo microscope in the PCB area, the main lab benefits from dedicated inspection capability.

Documentation microscope — A high-resolution camera-equipped microscope connected to a dedicated PC, used for recording measurement setups and component inspection. Keep this separate from the soldering microscope so both can be in use simultaneously.
Profilometer — For 3D surface scanning of miniature components. The Keyence VR series is excellent but expensive. Evaluate cost vs. need carefully.

5. Signal Conditioning & Low-Level Measurements

This section covers instruments for working with weak, noisy, or otherwise demanding signals. Most sensor development work depends heavily on these.

DAQ systems — NI USB-6003 for basic work. NI CompactDAQ for modular setups. NI PXIe for high-performance or timing-critical applications.
Streaming oscilloscope — For continuous high-bandwidth recording. I can only recommend Picoscope. Excellent software, good value, and the streaming capability is very useful when recording continuous high-bandwidth analog signals.
Standard oscilloscopes — One per workstation, mounted on a retractable arm. The Rigol DHO900-series (250 MHz) gives excellent value. Also get a few portable units for flexibility. These are workhorses of any physics or electronics lab.
Current probes — For measuring current waveforms without breaking the circuit.
High-end oscilloscope — At least one 2 GHz instrument with active probes for signal integrity work. It is impossible to recommend a specific model, it depends entirely on the needs of your lab. This will be a big investment, make it wisely.
Logic analyzer — Saleae makes the best logic analyzers on the market. The software is excellent.
Precision timing / TDC — If doing time-of-flight or pulse-based sensing, you need a dedicated Time-to-Digital Converter (TDC). I have experience with the Cronologic xTDC4 and can recommend it.
Pulse/delay generator — The Stanford Research DG645 is the standard instrument for generating precise trigger and delay sequences.

7. Environmental Control & Test Infrastructure

Without controlled test conditions, sensor characterisation data is unreliable. This section is often deferred and later regretted.

Environmental chamber — For temperature and humidity cycling. Essential for characterising sensor performance over environmental envelopes and for compensation/stabilization work. Also invaluable when working with sensors that only function well at low temperatures.
Temperature monitoring — Standalone calibrated temperature loggers both in the lab space and inside the thermal chamber. Do not rely solely on the chamber's internal sensor.
Vibration isolation table — For any measurement sensitive to mechanical noise (optical, acoustic, precision mechanical). An optical breadboard on damped feet is a cost-effective alternative to a full optical table.
Faraday cage — For EMI-sensitive measurements. Can be built in-house with copper mesh or aluminium sheet.
Blackout enclosure — For light-sensitive sensors and detectors.
Semi-anechoic enclosure — If working with microphones or acoustic sensors.
Laminar flow hood — A minimum dust-controlled workspace for handling sensitive components. A full cleanroom is rarely justified for R&D. A laminar flow hood is usually sufficient. If you expect to need an entire cleanroom, you'll need more help than this little guide.

8. Calibration & Reference Standards

Not necessary on day one, but quickly becomes important when you need traceable, publishable results.

Without metrological traceability via NIST or equivalent national metrology institutes, your results cannot be compared to anyone else's. If that is not important for you, skip the items in this section, but be aware of the consequences. Calibrated measurements are not important in early R&D, but can later become crucial.

Calibrated reference sensors and sources — For each sensing modality in use. Must be NIST-traceable or equivalent.
Precision voltage reference — The Fluke 732C or equivalent. Used to calibrate DMMs and verify SMU accuracy.
Calibration gases — If doing chemical or gas sensing.
Calibrated RF reference loads and standards — For VNA calibration verification.
Oscilloscope calibration — This can be outsourced to a calibration service rather than done in-house.

This section is relevant if the lab will undertake RF, radar, or wireless sensing work. Some items (spectrum analyzer, signal generator) are useful in any electronics lab.

Vector Network Analyzer (VNA) — Measures S-parameters of RF components and antennas. The NanoVNA is a capable and extremely affordable starting point (< €100). For serious work, upgrade to a Keysight or Rohde & Schwarz instrument.
SOLT calibration kit — A VNA is only as good as its calibration. Match the cal kit to the connector type (SMA, N-type, etc.) on your VNA.
Phase-stable test cables — Standard coax changes its electrical length as it flexes due to thermal and mechanical effects, corrupting calibration. Phase-stable cables (e.g. Huber+Suhner Sucoflex) are essential for VNA measurements.
Spectrum analyzer — For signal monitoring and EMC pre-compliance. Both a scanning and a real-time spectrum analyzer (RTSA) are useful if budget allows. If doing EMC pre-compliance, worth getting a kit of EM field and magnetic field probes.
Software-Defined Radio (SDR) — The HackRF One is excellent for rapid prototyping and signal exploration. It cannot replace a dedicated spectrum analyzer but is far more flexible for development work.
RF arbitrary waveform generator — For generating custom RF stimuli during sensor characterisation.
Semi-anechoic test enclosure — For RF sensor characterisation in a controlled electromagnetic environment. See anechoic chamber.
Directional and horn antennas — Check Tekbox and Aaronia for cost-effective options.
RF power meter + calibrated step attenuators — For accurate signal level measurements.
Coax torque wrench — SMA connectors should be tightened to a specified torque (typically 0.9 Nm). Hand-tightening leads to inconsistent connections and connector damage over time.
Quality coaxial cables and adapters — SMA, N-type connectors in various lengths. Label all cables with their propagation delay.

10. Optical & Photonic Equipment

Wait until optical or photonic work is planned, with the exception of the thermal camera, which is useful in any electronics lab.

Optics is a specialised domain. If the lab will do serious optical work, involve someone with that background in the planning. This short guide cannot cover all aspects of optics, whih is a very broad field.

Thermal camera — Very useful for identifying hot spots on PCBs, verifying thermal management, and debugging power electronics. Worth having regardless of whether optics is a focus area. Fluke is the market leader on this.
Optical power meter and sensor heads — For characterising light sources and detectors.
Tunable laser or monochromator — For spectral characterisation of optical sensors.
Optical breadboard and mounting hardware — Thorlabs-compatible hardware is the de facto standard. Their website is also an excellent resource for optical component selection.
Lenses, beam splitters, light sources — Build up as needed.
Fibre optic components — Couplers, collimators, FC/PC connectors.

11. Chemistry & Electrochemistry

Relevant if chemical, gas, or biosensing work is planned. Requires dedicated lab space with appropriate ventilation and waste disposal. Involve a chemist in the planning.

Fume hoods — Mandatory for any work with volatile chemicals.
Potentiostat / galvanostat — For electrochemical sensor characterisation.
pH meter and calibrated buffers
Basic wet chemistry glassware and PPE
Microbalance — For preparing solutions and coatings with precision.
Micropipettes

10. Acoustic & Vibration Sensing

Only relevant if acoustic or vibration sensing is planned.

Calibrated measurement microphone — For acoustic sensor characterisation and room acoustics measurement.
Acoustic signal generator / speaker array
Reference accelerometers — Calibrated, for vibration and MEMS sensor testing.
Shaker table / piezo actuator — For applying controlled vibration stimuli.

The mechanical workshop handles cable and wiring assembly, enclosure fabrication, and 3D printing / laser cutting. It must be physically separate from the main lab to prevent dust, oils, and resin fumes from contaminating measurements and equipment. This area deserves its own detailed planning. What follows is a starting point.

1. Cable & Wiring Assembly

Crimping tools — The Engineer PA-09 and PA-21 cover JST, Dupont, and Molex connector types.
Connector housing and crimp stock — Molex, JST-PH, JST-XH in common pitches.
Wire stripper
Label printer — Brother PT-E550W or similar, with heat-shrink label capability. Consistent labelling is crucial.
Wire stock — 20 to 30 AWG silicone and PTFE insulated, multi-strand and single-strand. Silicone insulation is more flexible and heat-tolerant; PTFE has lower capacitance and is better for RF.
Heat shrink — Full size and colour assortment.
Coaxial cable stock — Compatible with SMA, SMB, and BNC. At minimum, RG316 for flexible SMA work.
RF connector assembly tools — For SMA, SMB, and BNC termination.

2. Mechanical & Enclosure Work

Bench drill press — With a selection of bits for metal and plastic.
Hand tools — Good set of screwdrivers, hex keys, nut drivers, pliers, side cutters, torque screwdriver. Do not cheap out on hand tools.
Tap and die set — M1.6 through M6 at minimum.
Sheet metal nibbler and hand punches — For panel cutouts.
Files and deburring tools
Calipers — Mitutoyo digital calipers are the standard. Do not use cheap calipers for anything that matters.
Bench vices
Small bandsaw
Dremel with accessory kit

Resin 3D printer — The Formlabs Form 3 produces excellent results for enclosures and fixtures requiring fine detail. Must be in a ventilated enclosure. Full PPE required: nitrile gloves, eye protection, IPA wash station, UV curing station. Resin fumes and uncured resin are hazardous.
FDM 3D printer — I have good experience with Prusa. Reliable, well-supported, large community. Good for rapid structural prototypes.
Machine screw inserts — Full range M1.6 to M5 for 3D printed enclosures. Install with a temperature-controlled soldering iron, not a standard iron.
Laser cutter — Requires proper extraction ventilation. Excellent for panel work, gaskets, and enclosure fabrication.
Hot plate with closed-loop temperature control — For curing coatings and annealing sensor materials. Keep separate from soldering workstations.
Analytical balance (0.1 mg resolution) — For preparing solutions and coatings.
Fastener stock — PCB standoffs and machine screws M1.6 to M5 in stainless, full length range. Machine nuts M1.6 to M5. You will run out of these constantly.
Miscellaneous — Zip ties, velcro cable ties, spiral wrap, hot glue gun.

The PCB and PCBA area covers design, prototyping, assembly, and inspection of circuit boards. It can share the main lab space if the layout permits, provided fume extraction is adequate at every station.

For background on PCB manufacturing and assembly processes, the IPC standards (particularly IPC-A-610 for acceptability of electronic assemblies) are the industry reference.

All soldering equipment from Weller. High quality and consistent range. This is a strong personal recommendation.

Solder station — Weller WX2N dual-port station.
Soldering iron — Weller WXP65 with a range of tips: chisel, conical, hoof.
Soldering tweezers — Weller WXMT + RTW 1 tip. Essential for 0402 and smaller passives.
Hot air rework station — Weller WHAP200 plus stand, for BGA rework and QFN removal.
Desoldering gun — The Hakko FR-301 has a strong reputation.
Fume extractor — HEPA + activated carbon filter at every station. Solder flux fumes are hazardous with prolonged exposure.
Stereo microscope — The Leica S6E and Olympus SZ61 are the standard instruments. Expensive, but do not scrimp here or expect eyestrain and missed defects. For extra flexibility, mount the microscope on a retractable swing arm.
PCB holder — Most PCB holders are terrible. I have tried many and can only recommend the Kaisi K-1208 and equivalents.
Consumables — Brass wool tip cleaner, desoldering braid (multiple widths), solder wire (0.2–1 mm), flux dispenser and flux pen, ethanol dispenser, lint-free tissues, cotton swabs, ESD-safe tweezers in multiple tip shapes.

Rapid in-house PCB prototyping dramatically accelerates iteration cycles compared to waiting for fab orders.

PCB miller — The LPKF ProtoMat series is the professional standard for in-house PCB milling. Expensive but reliable. Evaluate cost against your expected iteration frequency.
Perfboards and breadboards — For quick circuit validation before committing to a PCB layout. Adafruit and SparkFun both carry good selections.

3. PCB Cleaning, Inspection & Post-processing

Ultrasonic cleaner — With isopropyl alcohol or a dedicated PCB cleaning solution such as Zestron. Essential for removing flux residue from fine-pitch assemblies.
IPA wash bottle and stiff brush — For manual flux removal.
UV inspection lamp — For residual flux and conformal coating inspection.
Digital USB microscope — On a stand, separate from the stereo scope, for documentation and recording. Celestron makes reliable options.
Conformal coating and applicator — For protecting assemblies in humid or harsh environments.

Electrostatic discharge is invisible and frequently misunderstood. A single ESD event can cause immediate failure or latent damage that causes intermittent faults weeks later. Treat ESD protection as non-negotiable and train staff in the correct procedures.

ESD-safe flooring or anti-static mat — Covering the whole PCB area floor, not just individual bench mats.
ESD-safe component storage — Tubes, trays, and static-shielding bags.
ESD wristbands — One per person, worn at all times when handling bare PCBs or components.
ESD warning tape — Mark ESD-sensitive zones clearly.
Ionising air blower — At each workstation. Neutralises static charge on surfaces and components that cannot be grounded directly.

A well-stocked component library is mandatory. The time saved by having common parts on hand far outweighs the minor cost. If in doubt, always get more components. These kits can be purchased from Digi-Key or Mouser.

Resistors — 0402 to 0805 SMD in E96 series, 1% tolerance, full range 1 Ω–10 MΩ; through-hole 1/4W in E24
Capacitors — 0402 to 0805 SMD ceramic (C0G/NP0 for precision, X7R for general use); electrolytic through-hole for power decoupling
Inductors — 0402 to 0805 SMD power and RF inductors; toroidal through-hole for power work
Diodes — 1N4148, BAT54, Schottky, Zener (common voltages), LED in standard colours
Transistors — 2N7002, BSS138, BC847/BC857, 2N2222, 2N3906; a selection of MOSFETs for switching and linear use
Op-amps — LM324, TL071, OPA2134, AD8066, LT1028. Always have common op-amps in stock.
Voltage regulators — LM317, LM7805 family, AMS1117, LT1763, TPS series LDOs. Cover 1V–24V, 100 mW–10 W.
Logic ICs — 74HC series basics: gates, flip-flops, buffers, mux/demux, shift registers
Connectors — SMA, SMB, BNC, LEMO, JST-PH/XH, Molex KK, pin headers, power terminals
Crystals and oscillators — 8/12/16/25/32 MHz, plus 32.768 kHz for RTC applications
Storage — Akro-Mils drawers for through-hole; Licefa or Raaco SMD books for tape/reel storage. Label everything with value and package.

Keep permanent stock of:

Kapton tape in multiple widths
Double-sided thermal tape and thermal paste
Copper tape
Isopropyl alcohol (in bulk)
Deionised water (in bulk)
Acetone and ethanol (in bulk)
Cotton swabs and lint-free wipes

Only needed if doing PCBA at volume. For prototype quantities, hand soldering is sufficient.

The references in this section can be extremely large. For example, the EEVBlog is a collection of videos and blogs spanning more than a decade. They serve as further reading and good references for where to find specific information.