Active Element: Spectral Range 1-14 μm, Responsivity 1-10 A/W

Q: What is the difference between cooled and uncooled active elements?

Cooled elements (MCT, InSb) operate at cryogenic temperatures (77-200K) for higher sensitivity in mid-wave and long-wave IR. Uncooled elements (VOx microbolometers) operate at room temperature with lower sensitivity but simpler cooling requirements.

Q: How does active element material affect infrared detector performance?

Material determines spectral response range, quantum efficiency, response time, and operating temperature. MCT offers tunable spectral response, InSb provides high sensitivity in MWIR, while VOx microbolometers enable room-temperature LWIR imaging.

Q: What are common failure modes of infrared detector active elements?

Degradation from thermal cycling, delamination of thin films, contamination-induced dark current increase, electrostatic discharge damage, and material degradation at high operating temperatures.

Component Specifications

Definition

The active element is the core sensing component in an infrared detector that directly interacts with infrared radiation. It functions by absorbing infrared photons, which generate measurable electrical signals through photoconductive, photovoltaic, or thermoelectric mechanisms. This component determines key detector parameters including spectral response, sensitivity, response time, and noise characteristics.

Working Principle

Operates based on quantum or thermal detection principles. In quantum detectors (photodiodes, photoconductors), infrared photons excite charge carriers in semiconductor materials, changing electrical conductivity or generating voltage. In thermal detectors (microbolometers, thermopiles), absorbed radiation heats the element, altering its electrical resistance (bolometer) or generating thermoelectric voltage (thermopile).

Materials

Semiconductor materials: Mercury cadmium telluride (MCT), Indium antimonide (InSb), Lead selenide (PbSe), Silicon, Germanium. Thermal materials: Vanadium oxide (VOx), Amorphous silicon (a-Si), Bismuth telluride (Bi2Te3). Substrates: Silicon, Germanium, Zinc selenide.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Active Area	0.01-100 mm²
Responsivity	1-10 A/W
Response Time	1 ns-10 ms
Spectral Range	1-14 μm
Detectivity (D*)	10^8-10^11 Jones
Operating Temperature	77-300 K (cooled), 200-350 K (uncooled)
Noise Equivalent Power	10^-10-10^-12 W/√Hz

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 18526-1, ISO 18434-1, DIN 54190-1, DIN 54190-2

Parent Products

This component is used in the following industrial products

Infrared Detector

A sensor component that detects infrared radiation and converts it into an electrical signal.

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Engineering Analysis

Risks & Mitigation

Thermal shock during cooling cycles
Electrostatic discharge damage
Optical contamination reducing sensitivity
Material degradation at high temperatures
Delamination of thin-film structures

FMEA Triads

Trigger: Thermal stress during rapid temperature cycling
Failure: Cracking of semiconductor material or delamination of thin films
Mitigation: Implement controlled cooling/heating rates, use stress-relieved packaging designs, apply protective coatings

Trigger: Electrostatic discharge during handling or operation
Failure: Permanent damage to sensitive semiconductor junctions
Mitigation: Implement ESD protection circuits, use proper grounding procedures, apply conductive coatings

Trigger: Contamination from outgassing or environmental particles
Failure: Increased dark current and reduced signal-to-noise ratio
Mitigation: Hermetic sealing, getter materials, cleanroom assembly, regular maintenance cleaning

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% responsivity variation, ±2% spectral response shift, <10% non-uniformity across array

Test Method

Blackbody calibration, spectral response measurement, noise equivalent temperature difference (NETD) testing, modulation transfer function (MTF) analysis

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Frequently Asked Questions

What is the difference between cooled and uncooled active elements?