Howtosignalprocessing
- How does a lock-in amplifier work?
- What is the purpose for dual phase lock-in amplifier?
- What is dynamic reserve?
How does a lock-in amplifier work?
Lock-in amplifiers use a technique known as phase-sensitive detection to single out the component of the signal at a specific reference frequency and phase. Noise signals, at frequencies other than the reference frequency, are rejected and do not affect the measurement.
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.
What is dynamic reserve?
"Dynamic reserve" is a term used in lock-in amplifiers to define their ability to recover the signal from a determined noise level. Its regular definition is the ratio of the largest tolerable noise signal to the full-scale signal. Dynamic reserve is usually expressed in a logarithmic scale (dB).
