How do HgCdTe detectors work?
In HgCdTe, detection occurs when an infrared photon of sufficient energy kicks an electron from the valence band to the conduction band. Such an electron is collected by a suitable external readout integrated circuits (ROIC) and transformed into an electric signal.
What is MCT detector?
The MCT (Mercury-Cadmium-Telluride) IR (infrared) Detector Module is a thermoelectrically cooled detector element and preamplifier package optimized for acquiring spectral data with the LaserTune Quantum Cascade Laser (QCL) source.
How does DTGS detector work?
In a DTGS detector a change in the intensity of IR radiation striking the detector will cause a proportional change in temperature. Change in temperature in turn will cause change in the dielectric constant of DTGS and hence its capacitance. This change in capacitance is measured as the detector response in voltage.
What are the types of IR detectors?
The two main types of detectors are thermal and photonic (photodetectors). The thermal effects of the incident IR radiation can be followed through many temperature dependent phenomena. Bolometers and microbolometers are based on changes in resistance. Thermocouples and thermopiles use the thermoelectric effect.
What is infrared detector used for?
Infrared sensors are used in motion detection, night vision, astronomy, art restoration, gas detection, and a variety of other applications. Infrared light is a vital part of our lives, whether we realize it or not. Many sensors pick up IR in the form of infrared radiation. Infrared radiation can be felt as heat.
Which detectors are used in infrared IR spectroscopy?
The lead sulphide detector is used for the near-infrared region of the spectrum. For mid- and far-infrared radiation the mercury cadmium telluride detector is used.
Which detector is used in FTIR?
Photoconductive Detectors
| DETECTOR | TYPE | APPLICATION RANGE (\(cm^-^1\)) |
|---|---|---|
| MCT – B (Wide Band) | Photoconductive | 12500-400 |
| MCT – A (Narrow Band) | Photoconductive | 12500-650 |
| DTGS | Pyroelectric | Mid to far – IR depending on window material |
| Lithium Tantalate | Pyroelectric | Mid to far – IR depending on window material |
What is the use of bolometer?
bolometer, instrument for measuring radiation by means of the rise in temperature of a blackened metal strip in one of the arms of a resistance bridge.
What are the FTIR discs made of?
silicon carbide element
IR sources FTIR spectrometers are mostly used for measurements in the mid and near IR regions. For the mid-IR region, 2−25 μm (5,000–400 cm−1), the most common source is a silicon carbide element heated to about 1,200 K (Globar).
Which detectors are used in infrared spectrophotometer?
Infrared Spectrometry – Detectors The detectors can be classified into three categories, thermal detectors, pyroelectric detectors and photoconducting detectors.
Which one is an example of infrared detector?
Detecting the presence of humans trapped under collapsed buildings is one example of the use of an infrared sensor. Infrared sensors can detect infrared radiations from a body. These radiation-sensitive devices can also measure the heat being emitted by an object. IR waves are a part of the electromagnetic spectrum.
What is the history of HgCdTe infrared detectors?
HgCdTe infrared detectors have been intensively developed over the past forty years since the first synthesis of this com-pound semiconductor in 1958. Today, HgCdTe is the most widely used infrared detector material. This paper reviews key de-velopments in the crystal growth and device history of this important technology.
Is HgCdTe a good material for IR detector?
Fundamental HgCdTe properties HgCdTe ternary alloy is a nearly ideal IR detector material system.
What does HgCdTe stand for?
InfraRed Associates, Inc. offers a complete line of photoconductive Mercury Cadmium Telluride (HgCdTe) LN2 and TE cooled detectors. The wavelength response can be varied by adjusting the alloy composition of this ternary compound.
What is HgCdTe used for in photodetectors?
The bulk HgCdTe crystals were initially used for many types of IR photodetectors. At present they are still used for some IR applications such as n-type single element photoconductors, SPRITE detectors and linear arrays. Bulk growth produced thin rods,