Aim of the experiment

• Construction the optical beam line with the light source and pyroelectric detector
• Measuring signal in noisy environment using lock-in amplifier
• Analysis of signal-to-noise ratio

Learning and deepening of the following knowledge

• Working principles of lock-in amplifier
• Operating of simple optical elements
• Source of noise in measurements
• Signal modulation for a signal extraction from the noise
• Pyroelectric detectors  

Application

• An integral component in modern physics lab
• Precision AC voltage measurements
• Optical spectroscopy