A valve position measuring device of a safety valve of a voltage stabilizer based on a fiber-optic pooper sensor

Abstract

The present application belongs to the technical field of optical fiber sensing, and particularly relates to a valve position measuring device of a stabilizer safety valve based on an optical fiber Pappoe sensing, which comprises a stabilizer safety valve stem, a reflecting mirror, an optical fiber probe, a demodulator and an upper computer; the stabilizer safety valve stem is placed at a certain angle with the reflecting mirror and the optical fiber probe respectively, the optical fiber probe is connected to the demodulator, and the demodulator is connected to the upper computer. The present application adopts a non-contact measuring method, is not easy to cause abrasion to the sensing probe, and realizes high-precision measurement of the valve position of the safety valve; the optical sensor is used, has the advantage of anti-electromagnetic interference compared with the currently used valve position sensor, and the sensing probe can be miniaturized.

Description

Technical Field

[0001] This invention belongs to the field of fiber optic sensing technology, specifically relating to a valve position measuring device for a voltage regulator safety valve based on fiber optic PFOS sensing. Background Technology

[0002] Fiber optic sensing technology is a novel sensing technology developed in the 1970s. When light propagates in an optical fiber, external factors such as temperature, strain, pressure, magnetic fields, and sound waves can cause direct or indirect changes in parameters such as the amplitude, frequency, wavelength, and phase of the light wave. Therefore, the optical signal carries information about the external environment. In recent years, fiber optic sensing technology has flourished, and fiber optic sensors, with their advantages of being passive, small in size, resistant to electromagnetic interference, and resistant to high temperatures and pressures, have been applied in many fields.

[0003] In nuclear power plants, pressurizer safety valves serve as a safety safeguard for the primary loop system, ensuring the timely release of pressure within the pipelines during accident conditions and guaranteeing the safety of the system's piping and equipment. Therefore, they are crucial for the stable and safe operation of the nuclear power plant. The pressurizer safety valve position signal indicates whether the safety valve is open or closed, and is a vital signal directly reflecting the valve's position status.

[0004] Existing valve position measurement methods mainly employ a contact-type measurement method based on the differential inductance principle, where changes in valve stem position are directly transmitted to the measuring rod. Firstly, this method involves the measuring rod contacting the valve stem, which can easily cause wear. Secondly, the measuring rod may become stuck during use, affecting the valve position measurement function. Furthermore, valve position measurement methods based on the differential inductance principle are susceptible to electromagnetic interference.

[0005] Therefore, there is a need to provide a valve position measuring device for a voltage regulator safety valve based on fiber optic PFOS sensing to solve the problems existing in the prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a valve position measuring device for a voltage regulator safety valve based on fiber optic PFOS sensing, which solves the problems of easy wear, jamming, and electromagnetic interference of the valve position measuring rod in existing voltage regulator safety valves.

[0007] Technical solution to achieve the purpose of this invention:

[0008] A valve position measuring device for a voltage regulator safety valve based on fiber optic PFOS sensing, the measuring device comprising a voltage regulator safety valve stem, a reflector, a fiber optic probe, a demodulator, and a host computer;

[0009] The valve stem of the voltage regulator safety valve is placed at a certain angle to the reflector and the fiber optic probe, respectively. The fiber optic probe is connected to the demodulator, and the demodulator is connected to the host computer.

[0010] The valve stem end face of the voltage regulator safety valve is at a 45° angle to the fiber optic probe.

[0011] The valve stem end face of the voltage regulator safety valve is coated with a reflective film.

[0012] The valve stem end face of the voltage regulator safety valve is coated with aluminum, silver, and gold materials.

[0013] The valve stem end face of the voltage regulator safety valve is at a 45° angle to the reflector.

[0014] The reflector on the valve stem end face of the voltage regulator safety valve is made of silicon carbide, optical glass, aluminum, and beryllium.

[0015] The end face of the fiber optic probe is kept flat by cutting or grinding.

[0016] The light emitted by the demodulator propagates through the fiber optic probe to the valve stem end face of the voltage regulator safety valve, and is then reflected onto a reflector at a 45° angle to the valve stem end face. After reflection by the reflector, the light returns to the fiber optic probe along the same path. The reflected light from the fiber optic probe end face interferes with the reflected light from the voltage regulator safety valve valve stem and the reflector. The demodulator detects the interference light, and the host computer analyzes and processes the detected interference light to obtain the optical path difference information between the two reflected beams, thereby obtaining the valve position information.

[0017] The beneficial technical effects of this invention are as follows:

[0018] (1) The present invention adopts a non-contact measurement method, which is less likely to cause wear to the sensing probe;

[0019] (2) This invention enables high-precision measurement of the valve position of a safety valve;

[0020] (3) The present invention uses an optical sensor, which has the advantage of resisting electromagnetic interference compared with the valve position sensor currently in use;

[0021] (4) The sensing probe of the present invention can be miniaturized. Attached Figure Description

[0022] Figure 1 A schematic diagram of a valve position measuring device for a voltage regulator safety valve based on fiber optic PFOS sensing provided by the present invention.

[0023] In the diagram: 1-Valve stem of voltage regulator safety valve; 2-Reflector; 3-Fiber optic probe; 4-Demodulator; 5-Host computer. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described in the present invention without creative effort are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, the present invention provides a valve position measuring device for a voltage regulator safety valve based on fiber optic Fiber Optic Sensing. The measuring device includes a voltage regulator safety valve stem 1, a reflector 2, a fiber optic probe 3, a demodulator 4, and a host computer 5.

[0026] The valve stem 1 is coated with a reflective film. The valve stem 1 is at a 45° angle to the reflector 2 and the fiber optic probe 3 respectively. The fiber optic probe 3 is connected to the demodulator 4, and the demodulator 4 is connected to the host computer 5.

[0027] The end face of the valve stem 1 of the voltage regulator safety valve is coated with a reflective film, and the end face of the valve stem 1 of the voltage regulator safety valve is at a 45° angle to the fiber optic probe 3.

[0028] The light emitted by demodulator 4 propagates through fiber optic probe 3 to the end face of voltage regulator safety valve stem 1, and is then reflected onto reflector 2, which is at a 45° angle to the end face of voltage regulator safety valve stem 1. After being reflected by reflector 2, the light returns to fiber optic probe 3 along the same path. The reflected light from the end face of fiber optic probe 3 interferes with the reflected light from voltage regulator safety valve stem 1 and reflector 2. The demodulator 4 detects the interference light, and the host computer 5 analyzes and processes the detected interference light to obtain information such as the optical path difference between the two reflected beams, thereby obtaining the valve position information.

[0029] The valve stem 1 end face of the voltage regulator safety valve is coated with a reflective film.

[0030] The valve stem 1 end face of the voltage regulator safety valve is coated with aluminum, silver and gold materials.

[0031] The reflector 2 is made of silicon carbide, optical glass, aluminum, and beryllium.

[0032] The three end faces of the fiber optic probe are kept flat by cutting or grinding.

[0033] Existing valve position measurement methods mainly employ a contact-based method based on the differential inductance principle, where changes in valve stem position are directly transmitted to the measuring rod. Firstly, this method involves the measuring rod contacting the valve stem, which easily causes wear. Secondly, the measuring rod may become stuck during use, affecting the valve position measurement function. Furthermore, valve position measurement methods based on the differential inductance principle are susceptible to electromagnetic interference. This invention effectively solves these problems.

[0034] This invention employs a non-contact measurement method, which is less likely to cause wear and tear on the sensing probe;

[0035] This invention enables high-precision measurement of the valve position of a safety valve;

[0036] This invention uses an optical sensor, which has the advantage of being resistant to electromagnetic interference compared to currently used valve position sensors;

[0037] The sensing probe of this invention can be miniaturized.

[0038] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A valve position measuring device for a pressure regulator safety valve based on a fiber-optic PoPper sensor, characterized in that: The measuring device comprises a stabilizer safety valve stem (1), a mirror (2), a fiber probe (3), a demodulator (4) and an upper computer (5); The stabilizer safety valve stem (1) is placed at a certain angle with the mirror (2) and the fiber probe (3), the fiber probe (3) is connected to the demodulator (4), and the demodulator (4) is connected to the upper computer (5); The light emitted by the demodulator (4) is transmitted to the end face of the stabilizer safety valve stem (1) through the fiber probe (3), and then reflected to the mirror (2) which is at a 45° angle with the end face of the stabilizer safety valve stem (1), after the light is reflected by the mirror (2), it returns to the fiber probe (3) by the original route, the reflected light at the end face of the fiber probe (3) and the reflected light passing through the stabilizer safety valve stem (1) and the mirror (2) interfere with each other, the interference light is detected by the demodulator (4), the detected interference light is analyzed and processed by the upper computer (5), the optical path difference information of the two reflected lights is obtained, and then the valve position information is obtained.

2. The valve position measuring device of a stable voltage regulator safety valve based on fiber-optic PoPper sensing according to claim 1, characterized in that: The end face of the stabilizer safety valve stem (1) is at a 45° angle with the fiber probe (3).

3. The valve position measuring device of a stable voltage regulator safety valve based on fiber-optic PoPper sensing according to claim 2, characterized in that: The end face of the stabilizer safety valve stem (1) is coated with a reflective film.

4. The valve position measuring device of a stable voltage regulator safety valve based on fiber-optic PoPper sensing according to claim 3, characterized in that: The end face of the stabilizer safety valve stem (1) is coated with an aluminum, silver or gold film.

5. The valve position measuring device of a fiber-optic PoPper-sensor-based stabilizer safety valve according to claim 4, characterized in that: The mirror at the end face of the stabilizer safety valve stem (1) is made of silicon carbide, optical glass, aluminum or beryllium.

6. The valve position measuring device of a fiber-optic PoPper-sensor-based stabilizer safety valve according to claim 5, characterized in that: The end face of the fiber probe (3) is kept flat by cutting or grinding.

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