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Polymer film optical fiber F-P cavity-based underwater shock pressure sensor and dynamic calibration experiment system thereof

A technology of pressure sensor and polymer film, which is applied in the direction of fluid pressure measurement, measuring fluid pressure, instruments, etc. using optical methods, can solve problems such as failure to work normally, resistance to electromagnetic interference, etc., and achieve reliability improvement and dynamic matching error small effect

Inactive Publication Date: 2012-06-27
WUHAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is mainly aimed at the shortcomings of underwater electric explosion and underwater strong laser light explosion plasma expansion, and the traditional electromechanical sensors cannot work normally due to their inability to resist electromagnetic interference. Underwater shock wave pressure test system and corresponding dynamic calibration experiment system used in strong electromagnetic interference medium, namely: polymer film optical fiber F-P cavity underwater shock wave pressure sensor and its dynamic calibration experiment system

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  • Polymer film optical fiber F-P cavity-based underwater shock pressure sensor and dynamic calibration experiment system thereof
  • Polymer film optical fiber F-P cavity-based underwater shock pressure sensor and dynamic calibration experiment system thereof
  • Polymer film optical fiber F-P cavity-based underwater shock pressure sensor and dynamic calibration experiment system thereof

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Embodiment Construction

[0021] 1 Fabrication of underwater shock wave pressure sensor (probe) with polymer film optical fiber F-P cavity

[0022] figure 1Schematic diagram of the structure of the developed polymer film optical fiber F-P cavity shock pressure probe. The sensor is deposited sequentially on the end 3 of the cut conductive fiber, the Ag film with a thickness of 4nm to 8nm (preferably 5nm) constitutes the first reflective film 4 of the F-P cavity, and a parylene film with a thickness of 5um to 50um (preferably 30um) The formed F-P cavity body 5, the second reflective film 6 of the F-P cavity composed of a 20nm-30nm (preferably 20nm) thick Ag film, and a 3um thick parylene film constitute the entire F-P cavity protective film 7. The sensitive F-P cavity and the guiding fiber are integrated to form a monolithic structure.

[0023] Make:

[0024] ① Form an optical metal reflective film with low reflectivity at the end of the cut optical fiber. At the same time, the metal reflective film s...

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Abstract

The invention discloses a polymer film optical fiber F-P cavity-based underwater shock pressure sensor and a dynamic calibration experiment system of the sensor. The system adopts polymer film optical fiber F-P cavities to detect an underwater shock pressure, performs high-speed linear demodulation on an underwater shock sensor array which is formed by the polymer film ultra-short fiber F-P cavities by the three-wavelength light source excitation and random deterministic phase interval passive homodyne demodulation techniques, so as to achieve the effect of measuring an underwater shock pressure field. Besides, the method for dynamically calibrate the super-mini underwater shock pressure sensor having a plane structure is implemented by electromagnetic shock wave source excitation. The sensor is in parallel with the conventional sensing devices such as piezoelectric ceramics and piezoelectric polymer underwater shock pressure sensors or underwater ultrasonic sensors, and has not only a direct significance in measurement of shock pressures in strong electromagnetic interference environments but also an important significance in researches on underwater / ground shock pressure measurement and underwater ultrasonic sensor arrays.

Description

technical field [0001] The invention relates to the technical field of underwater shock wave pressure sensors, in particular to the technical field of underwater shock wave pressure sensors based on optical fiber sensing technology and their dynamic calibration experiments. Background technique [0002] For underwater shock wave pressure sensors, there are mainly piezoelectric ceramics (PZT or LiNbO 3 ) and piezoelectric polymer (PVDF). The former has higher sensitivity, but its own acoustic impedance does not match the acoustic impedance of the water medium, and the sensitivity frequency response characteristic curve is not flat, so it cannot achieve high-precision reproduction of the measured shock wave signal. In the latter, the acoustic impedance of itself is closer to that of the water medium, and the sensitivity frequency response characteristic curve is relatively flat, but the sensitivity is low. The two also have a common and most fatal shortcoming, which is that ...

Claims

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Application Information

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IPC IPC(8): G01L11/02G01L27/00
Inventor 王俊杰姜德生杨明红丁腾蛟王元化朱克银张佩
Owner WUHAN UNIV OF TECH
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