A liquid level detection system based on strained optical fiber sensor
An optical fiber sensor and liquid level detection technology, applied in the field of liquid level detection systems and detectors, can solve the problems of slow response speed, high difficulty, low detection accuracy, etc., and achieve the effects of weight reduction, low cost and simple installation process
Active Publication Date: 2022-07-29
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology
Due to the harsh application environment of the carrier and the complex and diverse states during the flight, it is difficult to arrange liquid level detection equipment inside the tank, and there are problems such as low detection accuracy and slow response speed
In summary, there is no mature carrier liquid level detection method
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[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0034] The present invention is a liquid level detection system based on a strain optical fiber sensor, which comprises a strain sensing optical fiber, an OFDR demodulation device and an ultrasonic excitation device. The strain sensing optical fiber is connected with the output end of the OFDR demodulation device through optical fiber; the strain sensing optical fiber is fixed on the outer wall of the container to be tested to form an array optical fiber sensing network, and the trigger signal is generated by the ultrasonic excitation device, and then based on the optical fiber sensing network and OFDR demodulation device to determine the liquid level of the solution in the container to be tested. The method is used to quickly and accurately detect the liquid level state of the aerospace thruster, so as to ensure the stable and reliable...
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Abstract
The present invention is a liquid level detection system based on a strain optical fiber sensor, which comprises a strain sensing optical fiber, an OFDR demodulation device and an ultrasonic excitation device. The strain sensing optical fiber is connected with the output end of the OFDR demodulation device through optical fiber; the strain sensing optical fiber is fixed on the outer wall of the container to be tested to form an array optical fiber sensing network, and the trigger signal is generated by the ultrasonic excitation device, and then based on the optical fiber sensing network and OFDR demodulation device to determine the liquid level of the solution in the container to be tested. The method is used to quickly and accurately detect the liquid level state of the aerospace thruster, so as to ensure the stable and reliable operation of the spacecraft. The invention can acquire three-dimensional liquid level information, and the acquired data has high precision, small volume and light weight, and has the capability of continuous sensing in harsh environments. At the same time, compared with the measurement method of the electrical liquid level gauge, the weight of the sensor is reduced, and the heavy loss caused by the spark of the equipment to detonate the flammable liquid is eliminated.
Description
technical field [0001] The invention relates to a detector, in particular to a liquid level detection system of a large-scale low-temperature liquid storage tank, belonging to the technical field of non-contact detection. Background technique [0002] At present, the methods used to detect the liquid level of cryogenic tanks are mainly divided into two categories, one is contact measurement, such as static pressure submersible liquid level gauge and spherical float liquid level gauge, etc.; the other is non-contact measurement, such as Ultrasonic level gauge and radar level gauge, etc. The liquid level detection method used in the propellant tank of the carrier is mainly a tension wire capacitance level gauge, that is, a high-strength tension wire is arranged in the structural void inside the carrier tank body, and a capacitance sensor is mounted on the tension wire for measurement. Due to the harsh application environment of the carrier and the complex and diverse states d...
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IPC IPC(8): G01F23/22
CPCG01F23/22
Inventor 杨勇韩一君梅影唐才杰李瑞艳王雪锋
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES