A method for preparing a temperature sensing probe of a microprobe and its uses

Abstract

The present invention relates to a method for preparing a temperature-sensing probe of a microprobe and its use. The method uses a micro-thermistor as the core temperature-measuring component. By first injecting thermal grease at one end of the probe tube, then placing the micro-thermistor, and finally filling it with epoxy resin, a temperature-sensing probe of the microprobe is obtained. This method has a simple process. The obtained temperature-sensing probe of the microprobe has a small thermal time constant and good sealing performance when applied to deep-sea environmental temperature measurement. It has obvious negative temperature coefficient characteristics, good insulation characteristics, and fast response speed in the temperature range of -5°C to +35°C, and can withstand the extreme conditions of high pressure, high salt, and high humidity in the seawater environment, and is suitable for rapid temperature measurement in the deep-sea environment.

Description

Technical Field

[0001] The present invention relates to a preparation method and use of a temperature sensing probe of a microprobe, in particular, the temperature sensing probe of the microprobe is applied to the deep sea field, has an obvious negative temperature coefficient characteristic in the temperature range of -5°C to +35°C, and the thermal time constant is less than 300 ms. It is a temperature sensing probe of a micro temperature probe suitable for rapid temperature measurement in the deep sea. Background Art

[0002] Due to the ever-changing temperature of the ocean environment, the boundaries of water masses overlap with each other, and there are small temperature differences between different water layers. Therefore, when the temperature sensor moves in the sea water following the ocean environment monitoring equipment, the indicated value of the temperature sensor is not the actual temperature at the current position, but the lagged display after the temperature at a certain moment at the current position is compensated by the internal circuit of the sensor. The time interval between these two moments reflects the speed of temperature response of the component, which requires the temperature sensor to have a fast response speed. In deep sea applications, in order to obtain a fast temperature measurement speed, generally, the purpose can be achieved by reducing the physical size of the thermistor. Since the ocean seawater temperature measurement needs to be placed in the seawater environment, the seawater has a high salinity and humidity, and there are different hydrostatic pressures at different depths. This requires insulating and sealing the thermistor and developing a temperature probe head to avoid the erosion of high pressure, high salt, and high humidity of the seawater. At the same time, in view of the technical requirements of deep sea observation, the temperature probe head needs to have a small thermal time constant. Summary of the Invention

[0003] The purpose of the present invention is to provide a preparation method and use of a temperature sensing probe of a microprobe. The probe uses a micro thermistor as the core temperature measuring component. By first injecting thermal conductive grease into the probe tube, then placing the micro thermistor, and finally filling with epoxy resin, the probe of the microprobe is obtained. When the probe is applied to the measurement of the deep sea environment temperature, it can withstand a relatively deep water pressure, has good insulation characteristics and fast response characteristics, and has an obvious negative temperature coefficient characteristic in the temperature range of -5°C to 35°C. It is a temperature sensing probe of a temperature probe suitable for rapid measurement in the deep sea.

[0004] The preparation method of a temperature sensing probe of a microprobe according to the present invention is carried out according to the following steps:

[0005] a. Use a probe housing with a probe tube length of 25 - 50 mm and an inner diameter of 0.6 - 1.1 mm, and place a rubber suction head at the lead end of the probe housing. Slowly suck the thermal conductive grease into the probe housing by means of siphon, and the injection depth of the thermal conductive grease is 10 - 15 mm;

[0006] b. Seal one end of the probe tube filled with thermal conductive grease in step a by means of laser welding;

[0007] c. Select a micro thermistor with an envelope size of 0.45 - 1.0 mm and gently place it into the probe tube in step a from the lead end of the probe housing. The lead length of the micro thermistor is 5 - 10 cm longer than the length of the probe housing;

[0008] d. Inject epoxy resin into the lead end of the probe housing containing the micro thermistor obtained in step c and cure it at 85 °C for 2 hours to seal the micro thermistor in the probe housing, thus obtaining the temperature sensing probe of the micro probe.

[0009] Use of the temperature sensing probe of the micro probe obtained by the said method in seawater temperature measurement.

[0010] Applied to the deep - sea environment, with a thermal time constant in water of 60 - 300 ms.

[0011] A temperature sensing probe of a micro probe according to the present invention, which uses a micro thermistor as the temperature measuring component, supplemented with thermal conductive silicone grease and epoxy resin as its filling materials, and the probe housing is made of stainless steel.

[0012] A method for preparing and using a temperature sensing probe of a micro probe according to the present invention. This method uses a micro thermistor as the core temperature measuring component. By first injecting thermal conductive silicone grease into one end of the probe tube, then placing the micro thermistor, and finally pouring in epoxy resin, a micro temperature probe head is obtained. Using the method of the present invention can achieve the filling of thermal conductive silicone grease inside a thinner probe tube and obtain the temperature sensing probe of the micro probe. This method has a simple process, the obtained temperature sensing probe of the micro probe has a smaller thermal time constant and good sealing performance. It has an obvious negative temperature coefficient characteristic, good insulation characteristic, and fast response speed in the temperature range of - 5 °C to + 35 °C, and can withstand the extreme conditions of high pressure, high salt, and high humidity in the seawater environment, and is suitable for rapid temperature measurement in the deep - sea environment. Detailed implementation method

[0013] Example 1

[0014] a. Select a probe housing with a probe tube length of 25 mm and an inner diameter of 0.6 mm. Place a rubber suction head at the lead end of the probe housing and slowly suck thermal conductive silicone grease into the probe tube by means of siphon. The injection depth of the thermal conductive resin is 10 mm;

[0015] b. Seal one end of the probe tube containing the thermal conductive silicone grease obtained in step a by laser welding;

[0016] c. Select a micro thermistor with an envelope size of 0.45 mm and gently place it into the probe tube in step a from the lead end of the probe housing. The lead length of the micro thermistor is 5 cm longer than the length of the probe housing;

[0017] d. Inject epoxy resin into the probe housing containing the thermistor obtained in step c, and cure it at 85°C for 2 hours to seal the thermistor into the probe housing, thus obtaining the probe head of the microprobe.

[0018] Apply the obtained probe head of the microprobe to deep-sea environmental temperature measurement. After testing, B 25 / 50 = 3500K, and the resistance value R 25℃ is 5 kΩ, and the thermal time constant in water is 60 ms.

[0019] Example 2

[0020] a. Select a probe housing with a probe tube length of 50 mm and an inner diameter of 0.9 mm. Place a rubber suction cup at the lead end of the probe housing, and slowly suck the thermal conductive silicone grease into the probe tube by means of siphon. The injection depth of the thermal conductive resin is 15 mm.

[0021] b. Seal one end of the probe tube containing the thermal conductive silicone grease obtained in step a by laser welding.

[0022] c. Select a micro-thermistor with a maximum envelope size of 0.8 mm and gently place it into the probe tube in step a from the lead end of the probe housing. The lead length of the micro-thermistor is 8 cm longer than the probe housing length.

[0023] d. Inject epoxy resin into the probe housing containing the thermistor obtained in step c, and cure it at 85°C for 2 hours to seal the thermistor in the probe housing, thus obtaining the probe head for sensing temperature of the microprobe.

[0024] Apply the obtained probe head for sensing temperature of the microprobe to deep-sea environmental temperature measurement. After testing, B 25 / 50 = 3500K, and the resistance value R 25℃ is 4.6 kΩ, and the thermal time constant in water is 150 ms.

[0025] Example 3

[0026] a. Select a probe housing with a probe tube length of 35 mm and an inner diameter of 1.1 mm, and place a rubber suction cup at the lead end of the probe housing. Slowly suck the thermal conductive silicone grease into the probe tube by means of siphon. The injection depth of the thermal conductive resin is 12 mm.

[0027] b. Seal one end of the probe tube containing the thermal conductive silicone grease obtained in step a by laser welding.

[0028] c. Select a micro-thermistor with an envelope size of 1.0 mm and gently place it into the probe tube in step a from the lead end of the probe housing. The lead length of the micro-thermistor is 10 cm longer than the probe housing length.

[0029] d. Inject the probe housing with the thermistor obtained in step c with epoxy resin and cure it at 85 °C for 2 hours to seal the thermistor in the probe housing, thus obtaining the temperature sensing probe of the microprobe;

[0030] Apply the obtained temperature sensing probe of the microprobe to deep-sea ambient temperature measurement. After testing, B 25 / 50 = 3500K, the resistance value R 25℃ is 6 kΩ, and the thermal time constant in water is 300 ms.

Claims

1. A method for preparing a temperature sensing probe of a microprobe, characterized in that Proceed as follows: a. Use a probe housing with a probe tube length of 25 - 50 mm and an inner diameter of 0.6 - 1.1 mm, and place a rubber suction tip at the lead end of the probe housing. Slowly suck the thermal grease into the probe housing by means of siphon, and the injection depth of the thermal grease is 10 - 15 mm; b. Seal one end of the probe tube filled with thermal grease in step a by laser welding; c. Select a micro thermistor with an envelope size of 0.45 - 1.0 mm and gently place it into the probe tube in step a from the lead end of the probe housing. The lead length of the micro thermistor is 5 - 10 cm longer than the probe housing length; d. Inject epoxy resin into the lead end of the probe housing containing the micro thermistor obtained in step c, and cure it at 85 °C for 2 hours to seal the micro thermistor in the probe housing, thus obtaining the temperature sensing probe of the micro probe.

2. Use of the temperature sensing probe of the micro probe obtained by the method according to claim 1 in seawater temperature measurement.

3. The use according to claim 2, characterized in that Applied to the deep - sea environment, with a thermal time constant in water of 60 - 300 ms.