Infrared detector

Infrared detector

An infrared detector is a photodetector that reacts to infrared (IR) radiation. The two main types of detectors are thermal and photonic.

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. Golay cells follow thermal expansion. In IR spectrometers the pyroelectric detectors are the most widespread.

The response time and sensitivity of photonic detectors can be much higher, but usually these have to be cooled to cut thermal noise. The materials in these are semiconductors with narrow band gaps. Incident IR photons can cause electronic excitations. In photoconductive detectors, the resistivity of the detector element is monitored. Photovoltaic detectors contain a p-n junction on which photoelectric current appears upon illumination.A few detector materials:


Vanadium pentoxide is frequently used as a detector material in uncooled microbolometer arrays.

External links

* [ Characteristics and Use of Infrared Detectors] Hamamatsu Photonics
* [ Technological Advances Lead to Greater Variety of Infrared Detectors] Hamamatsu Photonics

conclusionTHERMOCOUPLE-Di similar stripes of metals,BOLOMETER- Metal or semiconductor,THERMISTOR-Metallic oxide(not used in open environment),GOLAY CELL - Black metal plates (commercially used)

Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • infrared detector — infrared detector, a device sensitive to infrared radiation, used in such varying applications as guided missile tracking and navigation and high altitude aerial mapping …   Useful english dictionary

  • infrared detector — infraraudonosios spinduliuotės detektorius statusas T sritis radioelektronika atitikmenys: angl. infrared detector; IR detector vok. Infrarot Detektor, m rus. детектор инфракрасного излучения, m pranc. détecteur d infrarouges, m …   Radioelektronikos terminų žodynas

  • infrared detector — A detector of a narrow band of infrared rays, such as those emitted from a power plant of an aircraft or aerodynamic heating of aircraft skin, thus enabling a missile to home on its target. With modern IR (infrared) sensors, it is possible to… …   Aviation dictionary

  • SPRITE infrared detector — The SPRITE infrared detector is named after the process of signal integration carried out by Signal Processing In The Element . The technique was invented at the Royal Signals and Radar Establishment at Malvern by a team of scientists including… …   Wikipedia

  • Infrared vision — can be defined as the capability of biological or artificial systems to detect infrared radiation. The terms thermal vision and thermal imaging [ thermal imaging Encarta® World English Dictionary [North American Edition] © (P)2007 Microsoft… …   Wikipedia

  • Infrared astronomy — is the branch of astronomy and astrophysics which deals with objects visible in infrared (IR) radiation. Visible radiation ranges from 400 nm (blue) to 700 nm (red). Longer wavelengths than 700 nm but still shorter than microwaves are called… …   Wikipedia

  • Infrared and thermal testing — is one of many Nondestructive testing techniques designated by the American Society of Nondestructive Testing (ASNT) [Jackson, C.N. and C.N. Sherlock, 1998, Nondestructive Testing Handbook: Leak Testing, page 519, Library of Congress Cataloging… …   Wikipedia

  • Infrared — In fra*red , Infra red In fra red , a. [Infra + red.] 1. (Physics) Lying outside the visible spectrum at its red end; said of rays having a longer wavelength (and thus less refrangible) than the extreme red rays, specifically those… …   The Collaborative International Dictionary of English

  • Infrared Space Observatory — Infobox Space Telescope name = Infrared Space Observatory background = caption = organization = European Space Agency (ESA) major contractors = Aerospatiale (currently Thales) alt names = nssdc id = 1995 062A location = In decaying orbit orbit… …   Wikipedia

  • Detector óptico e infrarrojo cercano de brotes de rayos gamma — Para otros usos de este término, véase Grond. El instrumento GROND montado en el telescopio de 2,20 m del observatorio de La Silla (esquina inferior izquierda, el cilindro azul). El Detector óptico e infrarrojo cercano de brotes de rayos gamma… …   Wikipedia Español

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”