The principle of measuring glass thickness using laser heterodyne method.

To achieve the detection of the laser heterodyne signal in the laser heterodyne glass thickness measurement system, the measurement principle of the system is introduced. By analyzing the performance characteristics of several photoelectric detection circuits, a photoelectric detection circuit suitable for the system is designed, along with the corresponding unit module circuits.

To achieve the detection of laser heterodyne signals in laser heterodyne glass thickness gauges, the principles of laser heterodyne measurement are introduced. By analyzing the performance characteristics of several photoelectric detection circuits, a photoelectric detection circuit suitable for the system is designed, and a laser heterodyne detection unit module is provided.

In recent years, laser heterodyne technology has been widely applied in fields such as laser communication, radar, distance measurement, speed, and vibration sensing. In glass thickness measurement, laser heterodyne measurement technology has gradually replaced traditional methods due to its high resolution, high precision, good linearity, fast dynamic response, and online non-contact measurement capabilities. The light heterodyne signal in a heterodyne glass thickness gauge is an optoelectronic signal, containing a significant amount of background light noise and other harmonic components. Therefore, the laser emitted by the laser is reflected to the Doppler oscillator through optical mirrors K, L, and a semi-transparent mirror, where the oscillator's vibration generates a Doppler effect, changing the frequency of the laser. The laser is then reflected back to the surface of the glass being measured through the semi-transparent mirror L.

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