锁相放大器在激光外差信号检测中的应用  

Use of the Lock-in Amplifier Laser Heterodyne Signal Detection

作　　者：兰羽[1] 

机构地区：[1]陕西工业职业技术学院,陕西咸阳712000

出　　处：《机械与电子》2012年第11期43-45,共3页Machinery & Electronics

基　　金：陕西工业职业技术学院院级2010科研项目(ZK10-24)

摘　　要：目前,激光外差技术在激光测振、测速和测距等精密测量中已有广泛的应用,但在这些应用中待检测的光信号都非常微弱且含有大量噪声。为了提取该信号采用锁相放大器作为系统检测电路,在分析锁相放大器原理的基础上,设计了锁相放大器各模块电路并仿真。经实验测试,在给锁相放大器加幅度为0.01～0.5mV的信号时,在电路输出端可以得到信号。At present, the laser heterodyne technology has been widely used in precision meas- urement of the laser vibrometer, velocity, ranging in these applications to be detected optical signal is very weak and contains a lot of noise in order to extract the signal using the lock- in amplifier as a detection circuit. On the basis of the principle of a- nalysis of lock - in amplifier, the design of lock - in amplifier circuit and the simulation of each mod- ule. Experimental test, the lock - in amplifier to in- crease the range of 0.01-0.5 mV signal,the cir- cuit output can be obtained signal.

关 键 词：激光外差探测 锁相放大器 电路设计 MULTISIM仿真 

分 类 号：TN92[电子电信—通信与信息系统]