External cavity diode laser sensor
US4452533A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1981 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | Jul 22, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K5/70
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor for sensing conditions such as acoustic waves, temperature changes, acceleration current and magnetic fields. The sensor employs a diode laser having its cavity contained between end facets defined by partially reflective mirrors, supplemented by an external cavity formed between one of the end facets of the laser and a translatable external reflector. The reflector is position-responsive to a condition to be sensed. A change in the reflector's positions causes laser output light to be fed back through the mirror into the laser cavity with varying phase such that an increase or decrease in laser emission is created. A change of detector voltage or change in laser current provides an indication of environmental condition being sensed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.