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Phase measurement method using sawtooth wave phase modulation

A technology of phase measurement and sawtooth wave, which is applied in the field of phase measurement using sawtooth wave phase modulation, can solve the problem of heavy workload and achieve the effect of convenient modulation and demodulation process

Pending Publication Date: 2020-06-30
SOUTH WEST INST OF TECHN PHYSICS
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Problems solved by technology

The usual method of phase modulation is to make the phase change periodically in a sinusoidal form, and then extract the DC signal (or double frequency signal) and single frequency signal in the modulated signal. These two signals are orthogonal to each other, and the phase information is calculated from it, which belongs to Indirect measurement, heavy workload

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  • Phase measurement method using sawtooth wave phase modulation
  • Phase measurement method using sawtooth wave phase modulation
  • Phase measurement method using sawtooth wave phase modulation

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Embodiment Construction

[0026] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] The present invention uses the phase measurement method of sawtooth wave phase modulation to comprise the following process:

[0028] First, set the phase to be measured as The signal carrying this phase is:

[0029]

[0030] Among them, A(t) and B(t) are the amplitude and offset respectively, and they may change with time. In the following, A and B can be avoided by phase modulation, and the phase information can be directly extracted.

[0031] Next, the phase modulation is performed by periodic sawtooth wave, the modulation period is T, and the modulation amplitude is Then the phase change in a complete cycle is:

[0032]

[0033] The modulated signal becomes within one cycle (the modulation cycle...

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Abstract

The invention discloses a phase measurement method using sawtooth wave phase modulation, which comprises the following steps of: firstly, setting a phase to be measured as a signal carrying the phase,then, carrying out phase modulation through periodic sawtooth waves, and carrying out Fourier transform on the modulated signal in a period to obtain a phase value. The sawtooth waves are adopted forphase modulation, modulation and demodulation processes are convenient, specific phase information can represent physical quantities such as the length, the optical path and the refractive index, change information of the corresponding physical quantities is obtained by measuring phase changes, and the method can be widely applied to various measurement fields related to phases.

Description

technical field [0001] The invention belongs to the technical field of phase measurement and relates to a phase measurement method using sawtooth wave phase modulation. Background technique [0002] Phase measurement has the advantage of high resolution, and can measure tiny phase changes below one-thousandth or one-thousandth of a wavelength. At present, there are many phase measurement methods, mainly including: heterodyne method, phase shift method, and phase modulation method. The heterodyne method is to generate two electrical signals, electromagnetic waves or light waves with a certain slight frequency difference, and the two generate beat frequency, and the phase of the beat frequency signal is the phase information to be measured. The phase shifting method is to use the phase shifting device to generate several fixed phase shifts according to a certain step size (such as π / 4), and calculate the phase value through the signals under different phase shifts. This metho...

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Application Information

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IPC IPC(8): G01J9/04
CPCG01J9/04
Inventor 梁松林牛瑞华
Owner SOUTH WEST INST OF TECHN PHYSICS
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