Pyroelectric Detector


Also found in: Dictionary, Thesaurus, Acronyms.

Pyroelectric Detector

 

an electromagnetic radiation detector whose operation is based on the pyroelectric effect, that is, the temperature dependence of the spontaneous polarization of pyroelectrics. Pyroelectric detectors are classified as thermal radiation detectors. A pyroelectric detector may be considered as a voltage generator whose internal resistance is capacitive. Therefore, the detector is suitable only for recording radiation fluxes of variable intensity.

The sensing element of a pyroelectric detector is a thin sheet of a pyroelectric, such as triglycine sulfite, barium titanate, or lead titanate, with electrodes applied to the surfaces perpendicular to the polar axis. The electrode facing the radiation source has an absorptive coating whose optical properties determine the region of spectral sensitivity of the detector (in the wavelength range from tenths of a micron to several millimeters). The maximum sensitivity of a pyroelectric detector is constant over a broad frequency range, which makes it possible to use the detector at radiation modulation frequencies up to tens of megahertz (other thermal detectors can be used at modulation frequencies up to tens of hertz).

Pyroelectric detectors are used in the study of fast-changing thermal processes, in equipment for spectral research, in remote temperature sensors, and in thermal imaging devices.

REFERENCE

Kremenchugskii, L. S. Segneloelektricheskie priemniki izlucheniia. Kiev, 1971.

I. A. LEVINA

References in periodicals archive ?
When a pyroelectric detector was calibrated, an optical chopper was installed in front of the detector.
We calibrated three different types of NIR detectors with the NIR cryogenic radiometer-based monochromator system: InGaAs photodiodes, a Ge photodiode, and a pyroelectric detector. For each calibration, the responsivity uniformity of the detector active area was measured (at a typical wavelength of 1200 nm) by scanning the detector using the x-y translation stage in the detector box.
This results in a reduction in the uncertainty of the flatness of pyroelectric detector responsivity in the NIR.
The pyroelectric detector (Oriel Corp.) has an active area 5 mm in diameter.
To measure the uniformity and stability of [CO.sub.2] laser output, INO researchers used a 256-pixel array of pyroelectric detectors positioned in a straight line.
The intensity distributions observed by the pyroelectric detectors are extremely useful in laser design, particularly in the development and validation of spatial filters that can be used to provide specific intensity distributions.
Potential applications include random access memories, pyroelectric detectors, acoustic transducers and microwave devices.