How to use a boxcar averager in conjunction with lock-in amplifier

1. How does a boxcar averager work?
2. Why do we use lock-in amplifier?
3. What is the purpose for dual phase lock-in amplifier?

How does a boxcar averager work?

Traditional boxcar averagers implement a static measurement mode by generating a voltage that is proportional to the measurement result of the averager on some physical output connector. This method is static as the control parameters of the boxcar (gating time, gating delay, and gating length) do not change over time.

Why do we use lock-in amplifier?

Lock-in amplifiers are used to detect and measure very small AC signalsall the way down to a few nanovolts. Accurate measurements may be made even when the small signal is obscured by noise sources many thousands of times larger.

What is the purpose for dual phase lock-in amplifier?

A complete digital dual-phase lock-in amplifier system based on DSP and LabVIEW was designed. It can extract the weak sinusoidal signals submerged by noise. This design has the advantages of high accuracy, low cost and portability, and its update and transplantation are easy.