Digital phase lock amplifying experimental device

Abstract

The invention provides a digital phase lock amplifying experimental device. The experimental device comprises a power supply module, a digital module, a generator module, an analog module and a front panel module. The power supply module is sequentially connected with the digital module, the analog module, the front panel module and the generator module. The digital module is respectively connected with the analog module, the front panel module and the generator module. With no direct current amplifier equipped inside an output channel, the digital lock phase amplifier is enabled to suffer no interference generated by instability of the direct current amplifier working performances with the time change and the temperature drift of the direct current amplifier due to the temperature change and further alleviate the error due to the instability of a reference signal. A digital signal processing unit can achieve a phase lock function in a shortest time or even with no time delay. The digital phase lock amplifying experimental device is especially advantageous in terms of frequency scanning measurement. By adopting the high-performance quadrature demodulation technology of the digital lock phase amplifier, the detection precision of weak signals can be significantly improved. The cost performance of the digital lock phase amplifier is obviously increased. The digital phase lock amplifying experimental device is thus more influential in the measuring technical field.

Description

technical field [0001] The invention relates to an experimental device, in particular to a digital phase-locked amplification experimental device. Background technique [0002] A lock-in amplifier is a high-performance general-purpose measurement instrument that can accurately measure weak signals buried in noise. With the rapid development of science and technology, in many fields such as electronics, information science, optics, magnetism, mechanics, low temperature physics, acoustics, biology, etc., it is increasingly necessary to measure weak signals buried in noise. [0003] The basic idea of ​​phase-locked technology to measure weak signals mainly has two points. The first point is to use the reference signal to modulate the slow-changing or DC signal to realize frequency migration; the second point is to extract the weak signal to be measured by using signal correlation and low-pass filtering according to the nature of the signal to be measured and the noise are not ...

AI Technical Summary

Problems solved by technology

Since there are analog devices such as DC amplifiers in the analog part, the instability of the operating characteristics of the analog lock-in amplifier over time and the interference caused by temperature drift will affect some indicators of the lock-in amplifier accordingly.

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