By using a double phase lockinamplifier to measure the AC strain, the measurement error can be decreased to 0.4% of the total measurement range.
如果使用双相位锁相放大器测量交变的被测量，误差将减小到全量程的0.4%以内。
2
This paper describes a method of suppressing correlation jamming at the frequency of reference signal which cannot be suppressed by lock-inamplifier and Boxcar integrator.
锁定放大器和取样积分器都不能抑制与参考信号同频率的干扰。 本文提出了一种能抑制这种干扰的方法。
3
The optical signal was amplified by a lock-inamplifier.