首页>
外国专利>
Laser transit-time anemometer detecting very small particles - uses photoreceiver(s) to detect reduction in power caused by light dispersion when particle passes focus point of laser diode
Laser transit-time anemometer detecting very small particles - uses photoreceiver(s) to detect reduction in power caused by light dispersion when particle passes focus point of laser diode
Quasi-dot-shaped registration of flow characteristic values in optically transparent media is achieved by measuring the transit time of individual particles optically detectable in the stream. At least two beam paths (4,5) are used to produce neighbouring focus points (7,8) at a known distance apart. The focusable light source (1) is pref. provided by a laser diode. If a particle passes through a point of focus it disperses light, reducing the power of the associated beam path. This is detected by at least one photoreceiver (10) intercepting the beam paths. This serves as a start or stop signal for the transit time measurer (13). ADVANTAGE - Allows light intensity at points of focus for detection of small particles to be reduced.
展开▼
