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A Method for Acquiring Polarization-Dependent Measurement Data

A measurement data and polarization-related technology, which is applied in the field of obtaining polarization-related measurement data, can solve the problems of impractical optical fiber sensing systems, complicated mathematical analysis, and affecting the measurement results of polarization-related data.

Active Publication Date: 2017-06-27
朱用昌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The time-varying characteristics caused by the aging of the light source with time, the temperature characteristics of the photodetector, the optical coupling between the light source and the optical fiber, the optical fiber and the photodetector, the light (beam) and the optical fiber collimator, etc. Sensing system is not practical
[0007] Since each component in the optical fiber sensing system has time-varying characteristics, it greatly affects the measurement results of polarization-related data
The prior art does not realize the time-varying characteristics of the optical system. In order to improve the accuracy of the measurement data, although the photoelastic effect or the Pockels (Pockels) electro-optic effect is also used as an optical phase modulator to improve the measurement accuracy of the polarimeter, but There are still relatively large errors in the measured data, and because the sine wave is used as the basic modulation waveform, the already complex mathematical analysis becomes more complicated

Method used

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  • A Method for Acquiring Polarization-Dependent Measurement Data
  • A Method for Acquiring Polarization-Dependent Measurement Data
  • A Method for Acquiring Polarization-Dependent Measurement Data

Examples

Experimental program
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Embodiment 1

[0106] Embodiment one: if Figure 4As shown, a method for obtaining polarization-related measurement data, the method needs to provide an optical fiber sensing system, the optical fiber sensing system includes a light source, a modulation module, an isolated optical fiber, a sensing module, and a modulation voltage generator , the light source, the modulation module, the isolated optical fiber, and the sensing module are connected in sequence, and the output voltage of the modulation voltage generator is applied to the modulation module; the modulation module includes a polarizer, a phase modulation The sensing module includes a sensing element and a polarizer, and transmits the light emitted by the light source to the polarizer and the phase modulation element in sequence, and then passes it into the isolated optical fiber, and transmits the light emitted by the The light from the isolated optical fiber is sequentially transmitted to the sensing element, the polarizer, and th...

Embodiment 2

[0140] Embodiment 2: The physical quantity to be measured is current or magnetic field strength. The method is similar to the method in Embodiment 1, except that: Step 3 is: the modulated light is transmitted to the sensor through the incident optical fiber of the isolation optical fiber. In the element, at this time, the sensing element has the Faraday (Faraday) magneto-optical effect, wherein the passing light wave is loaded with information of current or magnetic field strength, and then the modulated light is transmitted to the analyzer, and then the The modulated light is transmitted to the outgoing fiber of the isolation fiber; step 5 is to calculate the measurement data proportional to the current or magnetic field strength through the intrinsic function group; other steps are the same.

Embodiment 3

[0141] Embodiment 3: The physical quantity to be measured is pressure or stress, and its method is similar to the method in Embodiment 1, except that: step 3 is: the modulated light is transmitted to the sensing element through the incident optical fiber of the isolation optical fiber In this case, because the sensing element has a photoelastic effect, the passing light wave is loaded with pressure or stress information, and then the modulated light is transmitted to the analyzer, and then the modulated light is transmitted to the In the outgoing fiber of the above-mentioned isolation fiber; step 5 is to calculate the measurement data proportional to the pressure or stress through the intrinsic function group; other steps are the same.

[0142] The optical fiber mentioned here, such as isolation optical fiber, refers to a single-mode optical fiber for general communication, and its birefringence has time-varying characteristics. Some fiber optic sensors, such as fiber optic in...

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PUM

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Abstract

The invention provides an optical fiber sensing system which comprises the components of a light source, a modulating module, an isolated optical fiber, a sensing module and a modulating voltage generator. The light source, the modulating module, the isolated optical fiber and the sensing module are successively connected. The output voltage of the modulating voltage generator is applied on the modulating module. The invention further provides a method for acquiring polarization-related measurement data. The optical fiber sensing system makes an optical fiber polarimeter effectively eliminate the influence of various outer time-varying characteristics such as mechanical vibration and ambient temperature, so that higher accuracy of the data which are acquired in measurement is realized.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a method for acquiring measurement data related to polarization. Background technique [0002] Polarization-dependent measurement is an important branch of optical measurement. As a part of the electromagnetic wave, the electric field component of light is a vector field during the propagation of space fluctuations, which is often described by its polarization state, which is described by the polarization orientation and phase difference of the vector. When the phase difference is zero, the polarization state is called linear polarization; when the phase difference is not zero, the polarization is called elliptical polarization or circular polarization. [0003] When the light propagates in the sensing unit, it interacts with the physical quantity to be measured, changing the polarization state of the optical field, so that the information of the measured physical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/30
Inventor 朱用昌
Owner 朱用昌