How does MCT detector work?
The MCT detector is a semiconductor and the electrons present in it absorb IR light and move from valence band to conduction band. These electrons in the conduction band generate an electrical current proportional to the IR intensity.
What is a 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.
What is an MCT HgCdTe detector?
J15 Series Mercury Cadmium Telluride Detectors. HgCdTe is a ternary semiconductor compound which exhibits a wavelength cutoff proportional to the alloy composition. The actual detector is composed of a thin layer (10 to 20 µm) of HgCdTe with metalized contact pads defining the active area.
Why are thermal detectors not used in FT IR spectroscopy?
Cooling to liquid nitrogen temperature is needed to avoid excitation of electrons by thermal motion. These detectors do not cover the complete IR range because there is a minimum energy needed to excite an electron, corresponding to a long wavelength limit.
What is detected by FTIR?
Fourier Transform Infrared Spectroscopy (FTIR) identifies chemical bonds in a molecule by producing an infrared absorption spectrum. The spectra produce a profile of the sample, a distinctive molecular fingerprint that can be used to screen and scan samples for many different components.
What is a detector of infrared radiation?
An infrared detector is a detector that reacts to infrared (IR) radiation. 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. Incident IR photons can cause electronic excitations.
What are infrared detectors made of?
Infrared detection uses a variety of materials to create a reaction that responds to electromagnetic radiation. The sensor will combine a layer of mercury cadmium telluride, a layer of lead sulfide, with a layer of indium antimonide substrate in silicon. The metals create a semiconductor within the device.
Is HgTe a semiconductor?
Mercury telluride (HgTe) is a IIb–VIb semiconductor crystallizing in the zinc-blende structure. HgTe forms alloys with many other IIb–VIb compounds.
What are two types of instruments that can detect infrared radiation?
An infrared detector is a detector that reacts to infrared (IR) radiation. The two main types of detectors are thermal and photonic (photodetectors).