Chirped fiber grating sensor and processing method

A chirped fiber grating and sensor technology, applied in instruments, measuring devices, fluid velocity measurement, etc., can solve problems such as the impact of shock wave velocity measurement, and achieve the effect of simple design and high efficiency

Inactive Publication Date: 2013-02-27
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) It is only suitable for the measurement of detonation wave / shock wave velocity in linear waveguide; (2) It is not suitable for the measurement of detonation wave / shock wave velocity in metal materials and some liquid materials; (3) microwave The size of the "spot" is about 10 mm, which has a great influence on the measurement of the detonation wave / shock wave velocity in the material; (4) It cannot be measured in a specific environment with strong electromagnetic interference

Method used

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  • Chirped fiber grating sensor and processing method

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Effect test

Embodiment 1

[0046] Embodiment one: if figure 1 As shown, the chirped fiber grating sensor includes a signal acquisition optical path, which is used to acquire the continuous velocity of shock wave or detonation wave in the measurement environment; a photoelectric converter, used to receive the optical signal of the signal acquisition optical path and convert it into an electrical signal; data acquisition The card is used to collect and store the high-speed continuous electrical signal output by the signal acquisition optical path, and transmit it to the processor for processing; the processor is used to receive the voltage signal output by the data acquisition card and calculate the shock wave or explosion in the measurement environment. The continuous velocity of the boom.

Embodiment 2

[0047] Embodiment 2. On the basis of Embodiment 1, the signal collection optical path includes a wide-spectrum light source, a chirped fiber grating, and an optical circulator; a wide-spectrum light source is used to provide a wide-spectrum continuous optical signal; a chirped fiber grating is used to Under the action of shock wave or detonation wave, the optical signal output by the optical circulator is reflected and returned to the optical circulator; the optical circulator is used to receive the optical signal output by the wide-spectrum light source and send it to the chirped fiber grating, and The optical signal returned by the chirped fiber grating is sent to the photoelectric converter.

Embodiment 3

[0048] Embodiment 3: On the basis of Embodiment 1 or 2, the length of the chirped fiber grating ranges from 10 mm to 100 mm, and the line width ranges from 5 nm to 40 nm.

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Abstract

The invention relates to the technical field of fiber sensor measurement, in particular to a chirped fiber grating sensor and a signal processing method for continuously measuring the speed of impact waves or detonation waves in order to solve the problems of a microwave interference method for measuring the impact waves or detonation waves by the aid of the characteristics that the detonation waves or impact waves act on a chirped fiber grating, the length of the fiber grating is decreased, and accordingly the light amplitude of return signals is decreased. The signal processing method includes the steps: acquiring the speed of continuous impact waves or detonation waves in a measuring environment by a signal acquisition light path; converting the speed into continuous light signals to be outputted and converting the light signals into electric signals by a photoelectric converter; processing data of voltage signals outputted by the photoelectric converter by a processor; and calculating the speed of the acquired continuous impact waves or detonation waves in the measuring environment. The chirped fiber grating sensor and the signal processing method are applied to the technical field of fiber sensor measurement.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensor measurement, in particular to a chirped optical fiber grating sensor and a processing method for measuring the velocity of continuous shock waves or detonation waves. Background technique [0002] As one of the characteristic parameters of explosives, detonation wave velocity is of great significance to the calibration of fluid dynamics calculation programs, chemical dynamic combustion models, research on rocket propellants, research on the combustion-detonation process of explosives, and research on the detonation characteristics of different explosive interfaces. . In addition, the shock wave velocity, as one of the key parameters of the dynamic high pressure of the material, plays an important role in the study of the propagation law of the shock wave and the dynamic high pressure characteristics of the material. [0003] Literature <Microwave interferometer for shock wave, det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/26
Inventor 邓向阳刘寿先彭其先李泽仁蒙建华
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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