Fiber Bragg Grating Wavelength Demodulation System and Demodulation Method for Preventing Piezoelectric Actuator Creep
A technology of piezoelectric actuator and wavelength demodulation, which is applied in the direction of instruments, conversion of sensor output, transmission of sensing components by optical devices, etc., can solve problems such as demodulation errors
Active Publication Date: 2020-08-28
XI AN JIAOTONG UNIV
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[0004] In order to solve the above-mentioned problems of static wavelength demodulation failure and static operating point drift causing demodulation errors, the purpose of the present invention is to provide an edge-filtering fiber grating wavelength demodulation system and method with piezoelectric actuator creep compensation function
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[0068] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0069] like figure 1 As shown, the light emitted by the broadband light source 1 passes through the optical isolator 2, the tunable F-P filter 3 and the optical coupler 4 in turn and is divided into two paths: one path passes through the F-P etalon 7, and this path is defined as a feedback path; the other path passes through After the circulator 5 is reflected by the fiber grating 6, this channel is defined as a measurement channel. The transmitted light of the F-P etalon 5 and the reflected light of the fiber grating 6 pass through the photoelectric conversion and signal conditioning circuit 8, and then the two-way voltage signals are collected by the data acquisition card 9 and sent to the host computer 10, and the host computer 10 simultaneously transmits data to the data acquisition card 9. Send control commands. One of the analog output voltages of the...
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The invention discloses a fiber grating wavelength demodulation system and method for preventing creep of a piezoelectric actuator. In the fiber grating wavelength demodulation system for preventing the creep of the piezoelectric actuator, a light emitted by a broadband light source is divided into two paths after passing through an optical isolator, a tunable F-P filter and an optical coupler, wherein one path passes through an F-P etalon, and the other path passes through a circulator and is reflected by the fiber grating; the optical signals of the above two channels are collected by a dataacquisition card and sent to an upper computer after passing through a photoelectric conversion and signal conditioning circuit; and one analog output voltage of the data acquisition card passes through a proportional circuit and then passes through a summing circuit with the other analog output voltage to drive the tunable F-P filter. The upper computer program monitors the input voltage of thedata acquisition card on the one hand, and calculates the wavelength demodulation sensitivity and control characteristic value by using the monitored data on the other hand, and controls the output voltage of the data acquisition card, so as to eliminate the influence of the creep of the piezoelectric actuator in the tunable F-P filter, and complete the fiber grating wavelength demodulation.
Description
technical field [0001] The invention belongs to the wavelength demodulation technology of fiber gratings, in particular to a fiber grating wavelength demodulation system and demodulation method for preventing piezoelectric actuators from creeping. Background technique [0002] Fiber Bragg grating (FBG) realizes the sensing and measurement of physical quantities by converting information such as strain and temperature into its reflection wavelength offset. Therefore, in the measurement system with FBG as the sensing unit, wavelength demodulation is the core link. At present, in commercialized wavelength demodulators, a wavelength demodulation method based on wavelength scanning is widely used. An outstanding advantage of this method is that it is convenient to realize the wavelength demodulation of large capacity and distributed FBG. However, when performing high-speed wavelength demodulation, the cost of the measurement system based on this method will become very high. I...
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IPC IPC(8): G01D5/353
CPCG01D5/35338
Inventor 张小栋牛杭邸发贵
Owner XI AN JIAOTONG UNIV