A digital lock-in amplifier phase synchronization method and system

Abstract

The application discloses a method and system for phase synchronization of a digital lock-in amplifier. The method includes: the phase adjustment module obtains an adjustment enable signal, and enters an adjustment mode based on the adjustment enable signal; Measure the result, and adjust the first phase signal to the second phase signal; the sinusoidal signal generator generates the first sinusoidal signal based on the second phase signal; A sinusoidal signal is multiplied; the low-pass filter filters out the high frequency in the result of multiplying the signal output by the delay unit output by the multiplier and the first sinusoidal signal, and outputs the second measurement result; after a preset period of time, the phase adjustment module, A second measurement of the output of the low pass filter is recorded and the phase adjustment value is updated. The present application can effectively realize the phase synchronization of the digital lock-in amplifier and reduce resource consumption.

Description

technical field

[0001] The present application relates to the technical field of digital lock-in amplifiers, in particular to a phase synchronization method and system for digital lock-in amplifiers. Background technique

[0002] Lock-in Amplifier (LIA) is a technology widely used in measuring weak signals in larger noises, and has the advantage of strong anti-interference ability. In the magnetic confinement nuclear fusion plasma experiment, the laser dispersion interferometer requires high-precision phase-locked amplification. With the rapid development of digital technology, digital lock-in amplifiers have comprehensive advantages over analog lock-in amplifiers. When the digital lock-in amplifier is working, it is necessary to ensure the phase synchronization between the input signal and the reference carrier signal, otherwise the strength of the output signal will be weakened, and the measurement accuracy will be greatly reduced.

[0003] At present, there are roughly ...

Examples

Embodiment Construction

[0046] like figure 1 As shown, it is a method flowchart of Embodiment 1 of a digital lock-in amplifier phase synchronization method disclosed in the present application, and the method may include the following steps:

[0047] S101. The phase adjustment module acquires an adjustment enable signal, and enters an adjustment mode based on the adjustment enable signal;

[0048] When the phase between the signal to be measured and the reference signal of the digital lock-in amplifier needs to be synchronized, the phase adjustment module receives the adjustment enable signal, and the phase adjustment module enters an adjustment mode.

[0049] S102. The phase adjustment module acquires the first measurement result output by the current low-pass filter, and adjusts the first phase signal to a second phase signal;

[0050] When the phase adjustment module enters the adjustment mode, record the output value of the current low-pass filter, that is, obtain the measurement result of the c...

technical field

[0001] The present application relates to the technical field of digital lock-in amplifiers, in particular to a phase synchronization method and system for digital lock-in amplifiers. Background technique

[0002] Lock-in Amplifier (LIA) is a technology widely used in measuring weak signals in larger noises, and has the advantage of strong anti-interference ability. In the magnetic confinement nuclear fusion plasma experiment, the laser dispersion interferometer requires high-precision phase-locked amplification. With the rapid development of digital technology, digital lock-in amplifiers have comprehensive advantages over analog lock-in amplifiers. When the digital lock-in amplifier is working, it is necessary to ensure the phase synchronization between the input signal and the reference carrier signal, otherwise the strength of the output signal will be weakened, and the measurement accuracy will be greatly reduced.

[0003] At present, there are roughly ...

Examples

Embodiment Construction

[0046] like figure 1 As shown, it is a method flowchart of Embodiment 1 of a digital lock-in amplifier phase synchronization method disclosed in the present application, and the method may include the following steps:

[0047] S101. The phase adjustment module acquires an adjustment enable signal, and enters an adjustment mode based on the adjustment enable signal;

[0048] When the phase between the signal to be measured and the reference signal of the digital lock-in amplifier needs to be synchronized, the phase adjustment module receives the adjustment enable signal, and the phase adjustment module enters an adjustment mode.

[0049] S102. The phase adjustment module acquires the first measurement result output by the current low-pass filter, and adjusts the first phase signal to a second phase signal;

[0050] When the phase adjustment module enters the adjustment mode, record the output value of the current low-pass filter, that is, obtain the measurement result of the c...

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