Method and apparatus for monitoring the temperature and velocity of plasma sprayed particles
US5180921A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1991 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Nov 18, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2005/607
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and an apparatus for monitoring simultaneously the temperature and the velocity of sprayed particles. The system is comprised of a sensor head attached to the spray gun, an optical fibre transmitting the collected radiation to detection apparatus, and a protective detection cabinet having the detection apparatus that incorporates two detectors. A two-slit or multiple-slit mask is located in the sensor head at the end of the optical fibre. For the temperature measurements, the particle emitted radiation collected by the sensor head is transmitted to two photodetectors, filtered by interference filters at two adjacent wavelengths. The particle temperature may be computed from the ratio of the detector outputs. To measure the velocity, the two-slit system collects radiation emitted by the in-flight particles travelling in the sensor field of view, which generates a double peak light pulse transmitted through the optical fibre. The time delay between these two peaks may be evaluated automatically and the particle velocity computed knowing the distance between the two slit images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.