Radiation detector circuits which inhibit depoling of the detector
US4336452A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1980 |
| Grant date | Jun 22, 1982 |
| Priority date | — |
| Expiry date | Apr 3, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/191
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a pyroelectric detector circuit arrangement in which a pair of capacitive detector elements (C.sub.1 and C.sub.2) formed of polarized pyroelectric material are electrically connected in series with the directions of polarization of the elements being such that the normally produced signal voltages are in opposition, means are provided for inhibiting the depoling of the elements under conditions of cooling or excessive temperature cycling. These depoling inhibiting means comprise a pair of ultra-low leakage diode elements (D.sub.1 and D.sub.2) in series opposition connection and arranged in parallel connection with the capacitive detector elements. Connections are present between the common points in the diode series and the capacitive detector element series. The diode elements are arranged with respect to the directions of polarization of the detector elements so that under conditions of large decreases in temperature of the detector elements the voltages generated across the detector elements are effective to forward bias the diode elements into conduction and thereby inhibit depoling of the detector elements. The diode elements, under normal conditions of irradiation of the d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.