发明名称 |
Method and device for the measurement of physical quantities of light scattering mobile particles using a laser doppler anemometer |
摘要 |
The particle characteristics measurement has light for at least one pair of coherent beams superimposed at a given measuring point within the measuring volume, after passage of at least one of the beams through a phase modulator, with detection of light dispersed from particles within the measuring volume and analysis of the dispersed light w.r.t. its Doppler shift. The phase modulator is controlled by a pair of sinusoidal control signals of different frequency and amplitude. The receiver (4) for the dispersed light is coupled to a bandpass filter (5) with a filter frequency which is a common multiple of both the control signal frequencies. The filter has a bandwidth corresponding to the max. expected Doppler shift, the control signal amplitudes selected to provide for suppression of one sideband. |
申请公布号 |
EP0768531(A1) |
申请公布日期 |
1997.04.16 |
申请号 |
EP19960104279 |
申请日期 |
1996.03.18 |
申请人 |
JENOPTIK AKTIENGESELLSCHAFT |
发明人 |
DAMMANN, EHRHARD;BAUER, JUERGEN |
分类号 |
G01P3/36;G01P5/00;G01P5/26;G01P15/093;G01P21/02;G01S17/58 |
主分类号 |
G01P3/36 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|