Spectrometer of the electro-opto-acoustic type with capacitor-type detection
US4094608A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1976 |
| Grant date | Jun 13, 1978 |
| Priority date | — |
| Expiry date | Oct 14, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/1702
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A spectrometer generally of the electro-opto-acoustic type, using a capacitor type detection instead of acoustic detection. A holder with a sample carrier having a dielectric and with a conducting backing plate on one surface of the sample carrier and a transparent conducting coating and an electrical potential on the opposite surface, with the potential applied after sample accumulation. A source for directing a beam of radiation onto the sample for cyclically heating the sample and varying the spacing between the metal backing plate and conducting coating, and an ac detector circuit connected to the backing plate providing an ac signal varying with the spacing and hence with the composition of the sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.