首页> 外国专利> Laser anemometer with counting unit - has laser beam, photocell and counting unit to determine number of maxima and minima in modulated signal

Laser anemometer with counting unit - has laser beam, photocell and counting unit to determine number of maxima and minima in modulated signal

机译：带有计数单元的激光风速计-具有激光束，光电管和计数单元，可确定调制信号中的最大值和最小值

页面导航

摘要
著录项
相似文献

摘要

A laser aneomometer is used to determine the velocity of particles in a fluid. It produces interference fringes in the flow by means of the laser beam and it has a photoelectric cell to determine the Doppler frequency of the particles flowing in the fringe region. It also has a unit which counts the number of maxima and minima of the modulated signal detected by the photocell. The counting unit has an amplifier (15) with feedback (16) connected to the terminal (14) of the photocell. The output (17) of the amplifier (15) is connected to two diodes (18,19) and a capacitor (20) circuit. A comparator (21) connected to the amplifier (15) and the diode-capacitor circuit (18,19,20) produces a signal at its output (23) when the voltage difference between its two inputs (17,22) is greater than a present threshold.

机译：激光风速计用于确定流体中颗粒的速度。它通过激光束在流动中产生干涉条纹，并且具有光电电池，用于确定在条纹区域中流动的粒子的多普勒频率。它还具有一个单元，该单元对光电管检测到的调制信号的最大值和最小值进行计数。计数单元具有放大器（15），放大器（15）的反馈（16）连接到光电管的端子（14）。放大器（15）的输出（17）连接到两个二极管（18，19）和电容器（20）电路。当放大器的两个输入端（17,22）之间的电压差大于10％时，连接到放大器（15）和二极管-电容器电路（18,19,20）的比较器（21）在其输出端（23）产生信号。当前阈值。

著录项

公开/公告号FR2325937B1

专利类型
公开/公告日1979-02-16

原文格式PDF
申请/专利权人 ANVAR;
展开▼

申请/专利号FR19750030273
发明设计人
展开▼

申请日1975-09-26
分类号G01P5/20;
国家 FR
入库时间 2022-08-22 19:37:16

相似文献

专利
外文文献
中文文献