Fiber bragg grating temperature sensor high-low temperature test chamber batch calibration system

Abstract

The invention relates to a batch calibration system for a high-low temperature test box of a fiber grating temperature sensor, and belongs to the technical field of optical fiber sensing. The anti-static disc is of a horizontally-placed disc-shaped structure, and a columnar groove is formed in the center of the upper surface of the anti-static disc. The aluminum alloy uniform-temperature plate is of a disc-shaped structure; the aluminum alloy uniform temperature plate is fixedly placed in the columnar groove of the anti-static disc; the n fiber grating temperature sensors are fixed on the aluminum alloy uniform temperature plate through a polyimide single-side sensitive adhesive tape, and the adhesive tape is in a trapezoidal stretching state. The platinum resistor is arranged in the middle of the aluminum alloy uniform temperature plate to realize standard temperature measurement and data output; an inner cavity of the anti-static disc is filled with thermal insulation materials; the anti-static upper cover covers the anti-static disc; the anti-static disc is placed in a high-low temperature test box; the high-low temperature test box is connected with a demodulator and a computer to form a calibration system; according to the invention, the stability of the temperature of the sensor is ensured, and batch calibration of the temperature sensor is realized by placing a plurality of anti-static discs in the high-low temperature test box.

Description

Technical Field

[0001] This invention belongs to the field of fiber optic sensing technology and relates to a batch calibration system for a high and low temperature test chamber for fiber optic grating temperature sensors. Background Technology

[0002] Because fiber Bragg grating temperature sensors are serial structures, multiple sensors are connected and transmit signals through a single optical fiber. Temperature calibration requires simultaneous temperature calibration of multiple sensors on a single optical fiber under stress conditions, and batch calibration is required. However, metrology institutes and manufacturing units currently do not have a method for batch temperature calibration under stress conditions. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a batch calibration system for fiber optic temperature sensors in a high and low temperature test chamber. This system ensures the stability of the sensor temperature and solves the problem of batch calibration of temperature sensors by placing multiple anti-static trays in the high and low temperature test chamber.

[0004] The solution of the present invention is:

[0005] A batch calibration system for a fiber Bragg grating temperature sensor high and low temperature test chamber includes an anti-static tray, an aluminum alloy temperature distribution plate, an anti-static top cover, n fiber Bragg grating temperature sensors, polyimide single-sided sensitive tape, platinum resistance thermometer, thermal insulation material, a high and low temperature test chamber, a demodulator, and a computer.

[0006] The system comprises: an antistatic tray with a horizontally placed circular structure and a columnar groove at the center of its upper surface; an aluminum alloy heat spreader with a circular structure; the aluminum alloy heat spreader is fixedly placed in the columnar groove of the antistatic tray; n fiber optic temperature sensors are fixed to the aluminum alloy heat spreader using polyimide single-sided sensitive tape, with the tape in a trapezoidal stretched state; a platinum resistance thermometer is installed in the middle of the aluminum alloy heat spreader to achieve standard temperature measurement output data; the inner cavity of the antistatic tray is filled with heat insulation material; an antistatic cover is placed on the antistatic tray; the antistatic tray is placed inside a high and low temperature test chamber; and the high and low temperature test chamber is connected to a demodulator and a computer to form a calibration system.

[0007] In the above-mentioned batch calibration system for high and low temperature test chambers of fiber optic grating temperature sensors, the outer diameter of the antistatic disk is 335-345mm; the diameter of the columnar groove is 315-325mm; the height of the antistatic disk is 48-52mm; the depth of the columnar groove is 9-11mm; and the antistatic disk is made of antistatic material.

[0008] In the above-mentioned batch calibration system for high and low temperature test chambers of fiber optic grating temperature sensors, the aluminum alloy heat spreader has a disc-shaped structure; the diameter of the aluminum alloy heat spreader is 195-205mm; the thickness is 1.5-2mm; and insulation material is used to fill the gap between the aluminum alloy heat spreader and the anti-static disk to prevent air disturbance.

[0009] In the aforementioned batch calibration system for a fiber optic grating temperature sensor high and low temperature test chamber, the inner diameter of the antistatic cover is 335-345mm; the outer diameter is 345-355mm; the height of the antistatic cover is 28-32mm; and the thickness is 9-11mm.

[0010] In the above-mentioned batch calibration system for a fiber optic grating temperature sensor high and low temperature test chamber, the polyimide single-sided sensitive tape is not coated with adhesive in the middle, and the two sides of the polyimide single-sided sensitive tape are coated with 2mm wide adhesive; silicone rubber is used to fix the edges of the polyimide single-sided sensitive tape to the surface of the aluminum alloy temperature distribution plate; n is a positive integer not less than 10.

[0011] In the aforementioned batch calibration system for a fiber optic temperature sensor high and low temperature test chamber, heat preservation is achieved by covering the opening of the anti-static tray with an anti-static cover.

[0012] In the aforementioned batch calibration system for a high and low temperature test chamber of a fiber optic grating temperature sensor, when fixing the fiber optic grating temperature sensor, the connecting optical fiber of the fiber optic grating temperature sensor is coiled and fixed on the outside of the aluminum alloy temperature distribution plate.

[0013] In the aforementioned batch calibration system for a fiber Bragg grating temperature sensor high and low temperature test chamber, the platinum resistance thermometer is an industrial-grade platinum resistance thermometer.

[0014] In the aforementioned batch calibration system for a fiber optic grating temperature sensor high and low temperature test chamber, after the sensor is fixed to an aluminum alloy temperature plate using polyimide single-sided sensitive tape, vibration testing cannot be performed. It is left to stand for 7 days to fully cure.

[0015] In the above-mentioned batch calibration system for a fiber Bragg grating temperature sensor high and low temperature test chamber, the insulation material is degreased cotton; by filling the remaining space of the antistatic tray with the insulation material, the stability of the calibration environment temperature is ensured, and the temperature control accuracy reaches 0.01℃ within 30 minutes.

[0016] The beneficial effects of this invention compared to the prior art are:

[0017] (1) By using secondary insulation and filling the remaining space of the antistatic tray with heat insulation material (such as degreased cotton), the present invention ensures the stability of the calibration environment temperature and the temperature control accuracy can reach 0.01℃ within 30 minutes.

[0018] (2) The present invention achieves centralized acquisition and fixation of the temperature of no less than 10 sensors by using a temperature distribution plate;

[0019] (3) The present invention solves the problem of batch calibration of temperature sensors by placing multiple anti-static trays in a high and low temperature test chamber. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the antistatic tray of the present invention;

[0021] Figure 2 This is a schematic diagram of the heat spreader of the present invention;

[0022] Figure 3 This is a schematic diagram of the heat spreader plate of the present invention placed in an antistatic tray;

[0023] Figure 4 This is a schematic diagram of the fiber optic grating temperature sensor of the present invention;

[0024] Figure 5 This is a schematic diagram of the polyimide single-sided hypoallergenic tape of the present invention;

[0025] Figure 6 This is a schematic diagram of the temperature sensor fixed with polyimide single-sided sensitive tape according to the present invention;

[0026] Figure 7 This is a schematic diagram of the installation and fixing of the temperature sensor on the heat exchanger plate of the present invention;

[0027] Figure 8 This is a schematic diagram of the heat insulation material placed inside the antistatic tray of the present invention;

[0028] Figure 9 This is a schematic diagram of the antistatic tray installation cover of the present invention;

[0029] Figure 10 This is a schematic diagram of the test system of the present invention. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments.

[0031] This invention provides a batch calibration system for fiber Bragg grating temperature sensors in a high and low temperature test chamber. It achieves centralized temperature acquisition from 20 sensors using a temperature distribution plate; batch calibration of the temperature sensors is achieved by placing multiple temperature distribution plates within the high and low temperature test chamber; and stable control of the calibration environment within the test chamber is achieved through a secondary insulation method. This system enables accurate calibration of the fiber Bragg grating temperature sensors.

[0032] Since fiber Bragg grating temperature sensors are serial structures, multiple sensors are connected and transmit signals through a single optical fiber. During temperature calibration, multiple sensors on a single optical fiber need to be calibrated simultaneously under stress conditions, and batch calibration can be achieved.

[0033] A batch calibration system for fiber optic grating temperature sensors in a high and low temperature test chamber includes an anti-static tray, an aluminum alloy vapor chamber, an anti-static cover, n fiber optic grating temperature sensors, polyimide single-sided sensitive adhesive tape, a platinum resistance thermometer, thermal insulation material, a high and low temperature test chamber, a demodulator, and a computer. The anti-static tray is a horizontally placed circular structure with a columnar groove at the center of its upper surface. The aluminum alloy vapor chamber is also circular and is fixedly placed within the columnar groove of the anti-static tray. The n fiber optic grating temperature sensors are fixed to the aluminum alloy vapor chamber using polyimide single-sided sensitive adhesive tape, which is stretched in a trapezoidal shape. The platinum resistance thermometer is installed in the center of the aluminum alloy vapor chamber to provide standard temperature measurement output data. The inner cavity of the anti-static tray is filled with thermal insulation material. The anti-static cover is placed on top of the anti-static tray. The anti-static tray is placed inside the high and low temperature test chamber. The high and low temperature test chamber is connected to the demodulator and computer to form the calibration system.

[0034] Construct an anti-static tray. The anti-static tray is a horizontally placed, disc-shaped structure with a columnar groove at the center of its upper surface. The outer diameter of the anti-static tray is 335-345 mm; the diameter of the columnar groove is 315-325 mm; the height of the anti-static tray is 48-52 mm; the depth of the columnar groove is 9-11 mm; the anti-static tray is made of anti-static material. See [link / details] Figure 1 .

[0035] Fabricate an aluminum alloy heat spreader. Place the aluminum alloy heat spreader into the cylindrical groove of the anti-static tray and fix it in place. The aluminum alloy heat spreader has a disc-shaped structure; its diameter is 195-205mm; and its thickness is 1.5-2mm. Fill the gap between the aluminum alloy heat spreader and the anti-static tray with insulation material to prevent air turbulence. Figure 2 , Figure 3 As shown.

[0036] The antistatic cover is designed according to the dimensions of the antistatic tray. The inner diameter of the antistatic cover is 335-345mm; the outer diameter is 345-355mm; the height of the antistatic cover is 28-32mm; and the thickness is 9-11mm.

[0037] Based on the external dimensions of the fiber Bragg grating temperature sensor, a polyimide single-sided sensitive tape is designed; the sensor is fixed to an aluminum alloy heat spreader using the polyimide single-sided sensitive tape, with the tape in a trapezoidal stretched state; this achieves the fixation of n fiber Bragg grating temperature sensors.

[0038] The tape is not coated with adhesive in the middle, but has 2mm wide adhesive coating on both sides. The sensors are fixed to the surface of the temperature distribution plate using polyimide single-sided sensitive tape, with the tape in a trapezoidal stretched state. Silicone rubber is used to fix the edges of the polyimide single-sided sensitive tape to the structural surface, which can hold up to 20 fiber Bragg grating temperature sensors. Allow to stand for 24 hours; vibration testing is not allowed during this period. It will be fully cured after 7 days. See [link / details]. Figure 4 , Figure 5 , Figure 6 , Figure 7 .

[0039] A platinum resistance thermometer is installed in the middle of the aluminum alloy vapor chamber to provide standard temperature measurement output data, such as... Figure 7 As shown.

[0040] Fill the inner cavity of the antistatic tray with heat-insulating material (such as degreased cotton), see Figure 8 .

[0041] Place the anti-static cover over the anti-static tray, see Figure 9 .

[0042] Place the anti-static tray inside the high and low temperature test chamber; connect the demodulator and computer to form a test system, see [link / details]. Figure 10 This enables batch calibration of n fiber Bragg grating temperature sensors.

[0043] The polyimide single-sided hypoallergenic tape has no adhesive coating in the middle, and the two sides of the polyimide single-sided hypoallergenic tape are coated with 2mm wide adhesive; the edges of the polyimide single-sided hypoallergenic tape are fixed to the surface of the aluminum alloy heat spreader using silicone rubber; n is a positive integer not less than 10.

[0044] Insulation is achieved by covering the opening of the antistatic tray with an antistatic cover.

[0045] When fixing the fiber Bragg grating temperature sensor, the connecting optical fiber of the fiber Bragg grating temperature sensor is coiled and fixed on the outside of the aluminum alloy heat spreader.

[0046] The platinum resistance thermometer uses industrial-grade platinum resistance.

[0047] In this invention, the heat insulation material is degreased cotton; by filling the remaining space of the antistatic tray with heat insulation material, the stability of the calibrated ambient temperature is ensured, and the temperature control accuracy reaches 0.01℃ within 30 minutes.

[0048] A secondary insulation design was implemented to ensure the temperature control is less than 0.05℃; the thickness of the heat spreader was designed to accommodate multiple sensors using a single platinum resistance thermometer as the standard source; the outer diameter of the heat spreader was designed to allow for fiber optic cabling on its outer side; and the sensors were fixed to ensure zero mechanical stress in the sensitive direction during operation.

[0049] This invention ensures the stability of the calibrated ambient temperature by using secondary insulation and filling the remaining space of the antistatic tray with heat insulation materials (such as degreased cotton), and the temperature control accuracy can reach 0.01℃ within 30 minutes.

[0050] This invention solves the problem of batch calibration of temperature sensors by placing multiple anti-static trays in a high and low temperature test chamber.

[0051] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A batch calibration system for a fiber Bragg grating temperature sensor high and low temperature test chamber, characterized in that: Includes anti-static tray, aluminum alloy heat spreader, anti-static cover, n fiber optic temperature sensors, polyimide single-sided sensitive tape, platinum resistance thermometer, thermal insulation material, high and low temperature test chamber, demodulator, and computer; The system comprises: an antistatic tray with a horizontally placed circular structure and a columnar groove at the center of its upper surface; an aluminum alloy heat spreader with a circular structure; the aluminum alloy heat spreader is fixedly placed in the columnar groove of the antistatic tray; n fiber optic temperature sensors are fixed to the aluminum alloy heat spreader using polyimide single-sided sensitive tape, with the tape in a trapezoidal stretched state; a platinum resistance thermometer is installed in the middle of the aluminum alloy heat spreader to achieve standard temperature measurement output data; the inner cavity of the antistatic tray is filled with heat insulation material; an antistatic cover is placed on the antistatic tray; the antistatic tray is placed inside a high and low temperature test chamber; and the high and low temperature test chamber is connected to a demodulator and a computer to form a calibration system.

2. The batch calibration system for a fiber optic grating temperature sensor high and low temperature test chamber according to claim 1, characterized in that: The outer diameter of the antistatic tray is 335-345mm; the diameter of the columnar groove is 315-325mm; the height of the antistatic tray is 48-52mm; the depth of the columnar groove is 9-11mm; and the antistatic tray is made of antistatic material.

3. The batch calibration system for a fiber optic grating temperature sensor high and low temperature test chamber according to claim 1, characterized in that: The aluminum alloy heat spreader has a disc-shaped structure; the diameter of the aluminum alloy heat spreader is 195-205mm; and the thickness is 1.5-2mm. Use insulation material to fill the gap between the aluminum alloy heat spreader and the antistatic tray to prevent air disturbance.

4. The batch calibration system for a high and low temperature test chamber for a fiber optic grating temperature sensor according to claim 1, characterized in that: The inner diameter of the antistatic cover is 335-345mm; the outer diameter is 345-355mm; the height of the antistatic cover is 28-32mm; and the thickness is 9-11mm.

5. The batch calibration system for a fiber optic grating temperature sensor high and low temperature test chamber according to claim 1, characterized in that: The polyimide single-sided sensitive tape has no adhesive coating in the middle, and the two sides of the polyimide single-sided sensitive tape are coated with 2mm wide adhesive; the edges of the polyimide single-sided sensitive tape are fixed to the surface of the aluminum alloy heat spreader using silicone rubber; n is a positive integer not less than 10.

6. The batch calibration system for a fiber optic grating temperature sensor high and low temperature test chamber according to claim 1, characterized in that: Insulation is achieved by covering the opening of the antistatic tray with an antistatic cover.

7. The batch calibration system for a high and low temperature test chamber for a fiber optic grating temperature sensor according to claim 1, characterized in that: When fixing the fiber Bragg grating temperature sensor, the connecting optical fiber of the fiber Bragg grating temperature sensor is coiled and fixed on the outside of the aluminum alloy heat spreader.

8. The batch calibration system for a fiber optic grating temperature sensor high and low temperature test chamber according to claim 1, characterized in that: The platinum resistance thermometer used is an industrial-grade platinum resistance thermometer.

9. The batch calibration system for a fiber optic grating temperature sensor high and low temperature test chamber according to claim 1, characterized in that: After fixing the sensor to the aluminum alloy heat spreader using polyimide single-sided sensitive tape, vibration testing is not allowed. It will be fully cured after standing for 7 days.

10. The batch calibration system for a fiber optic grating temperature sensor high and low temperature test chamber according to claim 1, characterized in that: The insulation material is degreased cotton; by filling the remaining space of the antistatic tray with the insulation material, the stability of the calibrated ambient temperature is ensured, and the temperature control accuracy reaches 0.01℃ within 30 minutes.

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