CN103234652A - Micro platinum temperature sensor and preparation method thereof - Google Patents
Micro platinum temperature sensor and preparation method thereof Download PDFInfo
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- CN103234652A CN103234652A CN2013101384127A CN201310138412A CN103234652A CN 103234652 A CN103234652 A CN 103234652A CN 2013101384127 A CN2013101384127 A CN 2013101384127A CN 201310138412 A CN201310138412 A CN 201310138412A CN 103234652 A CN103234652 A CN 103234652A
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Abstract
The invention discloses a micro platinum temperature sensor and a preparation method thereof. Fine wires or thin bands made of high purity platinum or platinum alloy material with the diameter of smaller than or equal to 0.025mm are adopted for being wound into spiral coils or folded into wave-shaped coils; a second leading-out wire is welded on two leading-out end lines by adopting braze welding, electric resistance welding or laser welding; the leading-out wire is made of platinum alloy or other high temperature metal materials; four leading-out wires are formed; and the four leading-out wires are respectively welded on a pin bracket of a sensor device base to form a usable temperature sensor. The micro platinum temperature sensor has the characteristics of being small in volume and small in thermal capacitance, and is used for temperature measurement with special requirements on volume and thermal capacitance. The sensor is formed by processing ultrafine platinum alloy wires or thin bands, and is provided with a four-terminal measuring structure, so that the measured temperature change can be accurately and flexibly reflected.
Description
Technical field
The present invention relates to the temperature survey field, particularly relate to thermometric platinum resistance thermometer sensor, sensor.
Background technology
Temperature is one of fundamental physical quantity, its metering system and means are also many, in industry and scientific research field, normal thermopair, thermal resistance (Resistance Temperature Detector is called for short RTD), infrared radiation temperature meter, the semiconductor temperature probes etc. of adopting are electrical signal so that the electronic circuit of rear end further amplifies and handles with temperature transition.Usually the thermal resistance material comprises copper, platinum, nickel and Rhometal, wherein high-purity platinum and alloy thereof are because having higher temperature-coefficient of electrical resistance, simultaneously have characteristic high temperature resistant, corrosion-resistant, that temperature-measuring range is wide and the strength of materials is high again, be widely used in the temperature survey field.The resistance value of thermal resistance varies with temperature and is similar to linear change, and namely its temperature-coefficient of electrical resistance is a fixed value substantially, can also obtain higher temperature measurement accuracy as it is revised.
For platinum resistance, its temperature-coefficient of electrical resistance is defined as
α?=?[?R(100℃)?/?R(0℃)?–?1]?/?100
Wherein R (100 ℃), R (0 ℃) are respectively the resistance value of platinum resistance when 100 ℃ of temperature and 0 ℃, use for convenient, international temperature scale ITS-90 and GB " GB/T 5977-1999 resistance thermometer platinum filament " have been stipulated the value of temperature-coefficient of electrical resistance, and normal employing coefficient value is 0.00385/ ℃ in the commercial Application.At platinum-resistance thermometer, country has also formulated " JJG 160-2007 standard platinum resistance thermometer vertification regulation ".The platinum resistance device of industrial normal employing has Pt100 (0 ℃ of corresponding resistance value is 100 Ω), Pt1000 (0 ℃ of corresponding resistance value is 1000 Ω).
Conventional platinum resistor temperature measuring sensor can be a rhizoid, it is wrapped on quartz or the ceramic skeleton, and also can be thin film, adopt the method for thick film firing or vacuum sputtering that platinum is coated on the ceramic-like materials substrate.Traditional platinum temperature-measuring resistance element since skeleton or substrate arranged exist thermal capacitance bigger, treat the thermometric degree and change response certain hysteresis is arranged, limited at some volumes little, the application of the occasion that the temperature survey response change is fast.The present invention proposes a kind of platinum temperature probe that adopts ultra-fine platinum filament to make and is used for this type of environment.
Summary of the invention
Basic structure of the present invention as shown in Figure 1, mainly constituted by platinum thermometric coil and extension line, used platinum filament material satisfies GB " GB/T 5977-1999 resistance thermometer platinum filament " regulation, adopt diameter to be made as spiral-shaped less than platinum or the platinum alloy filament winding of 0.025mm, screw diameter 0.1-1.5mm, spacing is 0.01-0.5mm, the coiling number of turns 5 ~ 20 circle, and to the coil processing that formalizes.Weld second extension line in spiral extension line position by means such as soldering, electric resistance welding, Laser Welding (LBW) respectively, extension line can be platinum alloy or other high temperature metallic materials, forms four extension lines.Four extension lines are welded to respectively and form spendable temperature probe on the sensor component seat pin support.
Be to improve the structural rigidity of sensor, also can adopt the structure of thin strip spiral way as shown in Figure 2, with platinum filament by the rolling thin strip that becomes, thickness of strip≤0.020mm, helically coiling or after bending, form wave structure, as shown in Figure 3.And at second extension line of lead end welding.Have under corrosive atmosphere or the working temperature condition with higher at some, for preventing reacting at sensor body outside covering one deck inert material, as vitreum or Al with ambiance
2O
3Materials etc. as shown in Figure 4, but can cause that like this sensor thermal capacitance increases, i.e. increase the response of sensor/release time, needs to select for use according to actual conditions.
Two lead-in wires that increase are in order to measure the resistance variations of platinum sensor more accurately more at the sensor two ends, when using two traditional pin configurations, measured resistance comprises spiral part and the lead portion of temperature-sensitive, because lead portion region temperature and temperature-sensitive partly can be variant, and lead-in wire and the welding of rear end pin, the thicker metal of the general employing of pin, thermal conductivity is better, and leading part branch becomes the main source of measuring error.Increased by two lead-in wires for sensor after, the electronic amplifier circuit of adapted can use four end points measurement technologies, can effectively avoid the interference of lead resistance part, and the variation of accurate response front end temperature measuring area material resistance has improved thermometric accuracy.Owing to adopt silk material or thin strip to add man-hour, be subjected to the restriction of the strength of materials simultaneously, the number of turns of spiral or wave number can be restricted, and the silk material of its equivalence or the length of sheet material can be limited, and resistance value is difficult to reach more than 50 Europe, adopts four end-point methods to help to improve precision.
Traditional platinum resistance amplifying circuit has two ends, three ends and several forms of four ends, because sensor has four output leads, is the accuracy that guarantees to measure, and the amplifier circuit that the rear end connects needs adapted four ends to amplify form.When adapted four end points formula amplifiers, because the sensor electrical resistance is not 100 Europe of standard, circuit parameter need be done suitably and adjust.
Description of drawings
Fig. 1 is the miniature temperature probe of ultrafine wire helical coil structure; Fig. 2 is the miniature temperature probe of thin strip helical coil structure; Fig. 3 is the miniature temperature probe of thin strip wave structure; Fig. 4 is the miniature temperature probe of band protective layer structure. its structure has increased protective seam on Fig. 1 basis; protective seam is inert material, can be vitreum or Al
2O
3Material etc.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.Should correct understanding be: the method in the embodiments of the invention is only used for illustrating the present invention, rather than limitation of the present invention.
Embodiment 1
Adopting diameter is that the platinum filament coiling of 0.015mm is spiral-shaped, and the spiral external diameter is 0.4mm, and spacing is 0.05mm, the coiling number of turns 10 circles, and to the coil processing that formalizes.Both helical ends respectively keeps the 10mm platinum filament as first extension line.Weld the 0.015mm platinum filament as second extension line in spiral extension line position by electric resistance welding respectively, the long 10mm of lead portion.Four lead-in wires are welded to respectively on the sensor holder of four pins, and resulting sensor resistance when room temperature is about 15 ohm.
Embodiment 2
Adopt diameter to be that the platinum filament of 0.020mm is rolling and be thin strip, width 0.025mm, thickness 0.012mm, coiling is spiral-shaped, spiral external diameter 0.5mm, spacing is 0.08mm, the coiling number of turns 8 circles, and to the coil processing that formalizes.Both helical ends respectively keeps the 10mm thin strip as first extension line.Welding thin strip as second extension line near spiral extension line position by electric resistance welding, the long 10mm of lead portion respectively.Four lead-in wires are welded to respectively on the sensor holder of four pins, and resulting sensor resistance when room temperature is about 12 ohm.
Embodiment 3
Adopt diameter to be that the platinum filament of 0.020mm is rolling and be thin strip, width 0.025mm, thickness 0.012mm is folded into the wave-like of spacing 0.05mm with thin strip, and two ends respectively keep the 10mm thin strip as first extension line.Welding thin strip as second extension line near the folding position by electric resistance welding, the long 10mm of lead portion respectively.Four lead-in wires are welded to respectively on the sensor holder of four pins, and resulting sensor resistance when room temperature is about 12 ohm.
Claims (8)
1. miniature platinum temperature probe, it is characterized in that: adopt diameter to be less than or equal to the filament of 0.025mm or high-purity platinum or the platinum alloy material of thin strip, turn to spiral winding or be folded into the waveform coil, and adopt soldering, electric resistance welding or second extension line of Laser Welding (LBW) welding in two leading-out end line, extension line is platinum alloy or other high temperature metallic materials, form four extension lines, four extension lines are welded to respectively and form spendable temperature probe on the sensor component seat pin support.
As claim as 1 described miniature platinum temperature probe, it is characterized in that: described spiral winding diameter 0.1-1.5mm, spacing is 0.01-0.5mm, coiling number of turns 5-20 circle.
As claim as 1 described miniature platinum temperature probe, it is characterized in that: at the outside coated inert material of the spiral winding of institute's coiling.
As claim as 3 described miniature platinum temperature probes, it is characterized in that: inert material is aluminium oxide or vitreum.
5. the preparation method of a miniature platinum temperature probe, it is characterized in that containing following processing step: adopt diameter to be less than or equal to the filament of 0.025mm or high-purity platinum or the platinum alloy material of thin strip, turn to spiral winding or be folded into the waveform coil, and to the coil processing that formalizes, and adopt soldering in two leading-out end line, electric resistance welding or second extension line of Laser Welding (LBW) means welding, extension line is platinum alloy or other high temperature metallic materials, form four extension lines, four extension lines are welded to respectively and form spendable temperature probe on the sensor component seat pin support.
As claim as 5 described miniature platinum temperature probes, it is characterized in that: described spiral winding diameter 0.1-1.5mm, spacing is 0.01-0.5mm, coiling number of turns 5-20 circle.
As claim as 5 described miniature platinum temperature probes, it is characterized in that: at the outside coated inert material of the spiral winding of institute's coiling.
As claim as 7 described miniature platinum temperature probes, it is characterized in that: inert material is aluminium oxide or vitreum.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101384127A CN103234652A (en) | 2013-04-19 | 2013-04-19 | Micro platinum temperature sensor and preparation method thereof |
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| CN2013101384127A CN103234652A (en) | 2013-04-19 | 2013-04-19 | Micro platinum temperature sensor and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109282910A (en) * | 2017-07-20 | 2019-01-29 | 成都凯天电子股份有限公司 | Double redundancy temperature-sensing element (device) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2055254U (en) * | 1989-09-18 | 1990-03-28 | 机械电子工业部重庆仪表材料研究所 | Armored standard platinum thermometer |
| JP2002048652A (en) * | 2000-06-09 | 2002-02-15 | Meteolabor Ag | Temperature sensor |
| CN2869818Y (en) * | 2005-12-29 | 2007-02-14 | 东方汽轮机厂 | Platinum resistance temperature sensor |
| CN201421381Y (en) * | 2009-04-27 | 2010-03-10 | 绍兴春晖自动化仪表有限公司 | Platinum resistor temperature-sensing element |
-
2013
- 2013-04-19 CN CN2013101384127A patent/CN103234652A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2055254U (en) * | 1989-09-18 | 1990-03-28 | 机械电子工业部重庆仪表材料研究所 | Armored standard platinum thermometer |
| JP2002048652A (en) * | 2000-06-09 | 2002-02-15 | Meteolabor Ag | Temperature sensor |
| CN2869818Y (en) * | 2005-12-29 | 2007-02-14 | 东方汽轮机厂 | Platinum resistance temperature sensor |
| CN201421381Y (en) * | 2009-04-27 | 2010-03-10 | 绍兴春晖自动化仪表有限公司 | Platinum resistor temperature-sensing element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109282910A (en) * | 2017-07-20 | 2019-01-29 | 成都凯天电子股份有限公司 | Double redundancy temperature-sensing element (device) |
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Application publication date: 20130807 |