CN102331444B - Device for automatically testing aging performance and thermal time constant of thermistor - Google Patents

Device for automatically testing aging performance and thermal time constant of thermistor Download PDF

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Publication number
CN102331444B
CN102331444B CN 201110164592 CN201110164592A CN102331444B CN 102331444 B CN102331444 B CN 102331444B CN 201110164592 CN201110164592 CN 201110164592 CN 201110164592 A CN201110164592 A CN 201110164592A CN 102331444 B CN102331444 B CN 102331444B
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temperature
sample
thermistor
time constant
thermal time
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CN102331444A (en
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黎步银
刘明
胡宾鑫
戴世龙
黄龙
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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Abstract

The invention discloses a device for automatically testing the aging performance and a thermal time constant of a thermistor. The device comprises a high temperature water tank mechanism, a low temperature water tank mechanism, a sample position switchover mechanism, an automatic water feed unit and a measurement and control unit, wherein the sample position switchover mechanism is arranged between the two water tank mechanisms which are connected with the automatic water feed unit respectively; and the measurement and control unit is electrically connected with the sample. By the device, a test environment with constant temperature can be guaranteed, and automatic water level feed and sample position switchover are realized, so that data can be digitalized and full-automatic test on the aging performance and the thermal time constant of the thermistor can be realized; furthermore, the problems of non-uniform temperature field, nonadjustable temperature, inaccurate measured data and low efficiency of the conventional test equipment can be solved; and the device is applicable to real-time monitoring test or sampling test on a large quantity of produced thermistors.

Description

Aging and the thermal time constant automatic testing equipment of a kind of thermistor
Technical field
The invention belongs to electric current, voltage tester field, particularly aging the and thermal time constant automatic testing equipment of a kind of multichannel thermistor.
Background technology
Thermistor has the change in resistance wide ranges, and temperature measurement accuracy is high, the reliability high, and in temperature survey, temperature compensation and inhibition surge aspect are used very extensive.The test of thermistor parameter to the production technology of improving thermistor element, enhance productivity, guarantee that quality of production etc. has important meaning.At present factory is at the test thermistor during aging and thermal time constant particularly during negative tempperature coefficient thermistor NTC, all adopt boiling water boiling, manual testing's method, this method of testing test is inhomogeneous with the temperature field, temperature is non-adjustable, test data is inaccurate, many links need manual intervention, efficient is very low, is not suitable for the detection to bulk article.
Summary of the invention
The object of the present invention is to provide the aging and thermal time constant proving installation of a kind of multichannel thermistor, solved that temperature that existing testing apparatus exists is inhomogeneous, temperature is non-adjustable, measurement data is inaccurate, inefficient problem, be applicable to large batch of thermistor is carried out Real Time Monitoring test and sample testing.
Aging and the thermal time constant automatic testing equipment of a kind of thermistor, comprise high-temperature water channel mechanism, water at low temperature groove mechanism, sample position switching mechanism, self water feeding unit and measurement and control module, be provided with the sample position switching mechanism between the two tank mechanisms, two tank mechanisms connect respectively a self water feeding unit, measure and control module electrical connection sample.
Further, described high temperature and water at low temperature groove mechanism comprise tank, processor, signal condition module and temperature sampling module, send processor to after the water temperature signal process signal condition module of temperature sampling module collection, processor carries out water temperature control according to this signal and guarantees that tank is in temperature constant state.
Further, described high temperature and water at low temperature groove mechanism also comprise the stirring motor of laying near tank.
Further, described self water feeding unit comprises liquid level relay and the solenoid valve that joins.
Further, described sample position switching mechanism comprises telescopic cylinder, oscillating cylinder and sample support platform from the bottom up successively.
Further, described measurement and control module comprise slave computer, AD modular converter, program control sampling resistor array and host computer, host computer is to the slave computer transfer control instruction, slave computer is controlled telescopic cylinder, oscillating cylinder according to steering order and make the resistance tandem compound in program control sampling resistor array, and the resistance string joint group that obtains is electrically connected sample; The sample energising, the voltage of resistance string joint group sends host computer to through AD modular converter and slave computer successively, and host computer is for data processing and obtains thermistor resistance-time curve, and then determines thermistor ageing properties and thermal time constant according to this curve.
Further, described sample support platform is connected to leader.
Technique effect of the present invention is embodied in: the aging and thermal time constant automatic testing equipment of a kind of multichannel thermistor of the present invention, the test process full automation, the temperature environment of test usefulness is accurate, stable, test result shows at host computer, simple and clear, greatly improved the aging efficient that reaches thermal time constant of test thermistor, and the real-time detection mode that provides more can reflect the anti-aging characteristic of material.Specifically, high-temperature water channel mechanism and water at low temperature groove mechanism provide isoperibol, each tank mechanism is furnished with the self water feeding unit, can make that the medium liquid level remains in the fixing scope in the groove, and dielectric loss has good supply in the groove when doing burn-in test for a long time.The preferred pneumatic element of sample position switching mechanism switches specimen back and forth in high-temperature water channel and low temperature tank, the pneumatic element noise is little, but whole mechanical rotation process speed free adjustment and steady.Measurement and control module and sample away from, avoided the water vapour in the test process, measurement data is preserved at host computer fully simultaneously, and can draw thermistor resistance-time curve in order to intuitively observe the ageing resistance of thermistor by upper computer software.And multiple test mode is provided, and both can Real-Time Monitoring thermistor change in resistance, can do at any time sample testing again.Whole test process is fully automatic, does not need people's pro-active intervention, has greatly improved testing efficiency and accuracy.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is high and low temperature tank mechanism principle block diagram;
Fig. 3 is for measuring and the control module theory diagram;
Fig. 4 is program control sampling resistor array principle schematic;
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is described.
As shown in Figure 1, the present invention includes high-temperature water channel mechanism, water at low temperature groove mechanism, sample position switching mechanism, self water feeding unit and measurement and control module.
High-temperature water channel mechanism and water at low temperature groove mechanism are comprised of temperature-controlled cabinet 1, tank 2, stirring motor 3.
The self water feeding unit is comprised of liquid level relay 4, solenoid valve 5.
The sample position switching mechanism is comprised of telescopic cylinder 7, oscillating cylinder 8 and sample support platform 9, leader 10.
Measurement and control module 6 are placed on the position, upper left side of whole proving installation.
As shown in Figure 2, described high-temperature water channel mechanism, water at low temperature groove mechanism internal control circuit are comprised of embedded MCU numerical control unit, signal condition module, 16 bit AD sample modules, accurate platinum resistance multi-point temperature measurement module and stirring motor 3.Accurate platinum resistance is evenly distributed in the position, upper, middle and lower of tank, electric signal on the platinum resistance, by the signal condition module by being sampled by AD, analog electrical signal is converted to digital signal and gives the embedded MCU numerical control unit through behind the digital filtering, adopt expert PID that the tank temperature is precisely controlled at processor temperature control algorithm, traditional PID control technology for the time become, nonlinear, comprise many unknown parameters or be difficult to obtain good control effect with random disturbance.PID expert algorithm has overcome above shortcoming, and traditional PID control situation is segmented again, can carry out more effectively and accurately control complex situations, has overcome the shortcoming of the easy overshoot of traditional PI D, poor stability.
Described self water feeding unit, it is comprised of liquid level relay 4 and solenoid valve 5.Liquid level relay 4 stretches out three wire probes and inserts among the tank, relies on three probes to weigh height of liquid level, and switching signal is transferred to the supply of solenoid control media fluid.Because temperature range is very wide in this device tank,-5 degrees centigrade to 150 degrees centigrade, if use common liquid level sensor, sensor is difficult to adapt to so wide operating temperature range on the one hand, and the sensor failure problem can occur in so abominable high and low temperature environment; This device tank volume is little on the other hand, and common liquid level sensor volume is large, settles inconvenience.Can adapt to the wide operating temperature range of this device so comprise the self water feeding unit of liquid level relay, and to stretch in the tank only be three wires, the volume that takies is little, compares at last common liquid level sensor, uses liquid level relay to save cost.
Described sample position switching mechanism sampling pneumatic mode comprises a telescopic cylinder 7 and an oscillating cylinder 8.Oscillating cylinder 8 is fixed on the telescopic cylinder 7, and a sample support platform 9 is laid in oscillating cylinder 8 upper ends.Each cylinder is equipped with two magnetic switchs, the switching signal that these four magnetic switchs provide can pass to the DSP of measurement and control module, can know cylinder by these 4 switching signal DSP and whether forward assigned address to, thereby the velocity of rotation of appropriate regulation cylinder makes sample accurately fall in the tank, by adopting suitable velocity of rotation can reduce the liquid splash that causes when sample switches back and forth in the high-low-temperature groove, than traditional mechanical swing arm control, use pneumatic original paper to reduce noise in the actual use procedure, and whole mechanical rotation process is very steady.Sample support platform 9 is connected to leader 10, and the wiring of sample is passed leader 10 and is connected with measurement and control module 6, and leader 10 can prevent effectively that the sample wiring twines into one when sample position switches.
As shown in Figure 3, described measurement and control module 6 comprise slave computer, AD modular converter, program control sampling resistor array, host computer.Slave computer adopts DSP, and DSP is connected with the host computer electric signal with AD modular converter, program control sampling resistor array module; The electric signal of program control sampling resistor array module output through the sampling of AD modular converter, be converted to digital signal and send into DSP; DSP receives the control command that host computer sends, and controls the operation of whole system, and the data that collect are delivered to host computer, carries out the processing of data by host computer, and carries out the drafting of R-t resistance time curve.DSP is data processing centre (DPC), is responsible for the control of AD modular converter, accurate program controlled electric resistance array module and the control of cylinder and the realization of program are calculated in the processing of AD modular converter sampled data.DSP selects the TMS320VC5402DSP of TI company, and it has, and volume is little, cost is low, at a high speed and the characteristics of low-power consumption, is enough to the work for the treatment of of mass data in the competent thermistor performance test, its IO mouth aboundresources, and each module all is connected to DSP by the IO mouth.The AD chip is selected the ADS8509 of TI company, and it has the precision height, and sample rate is fast, can gather fast and accurately the voltage signal on the sampling resistor.After program debug is finished among the burned DSP.
Described DSP, ultra high speed A/D conversion module can order to the voltage signal V on 50 road sampling resistor arrays 1-V 50Sample.Then by serial ports host computer is sent in the data packing, the data that host computer received after preservation with regular time, and deposit fixed disk file in.By the unified voltage signal V that processes on the accurate sampling resistor array that gathers of upper computer software 1-V 50
Supply voltage is stabilized voltage supply, is known as Vs, and the value of accurate sampling resistor is R, because each road thermistor is all connected with accurate sampling resistor and is connected among the current supply circuit.Can calculate the resistance of the thermistor on each road according to minute platen press.
R i = V s - V i V i * R , ( i = 1,2,3 . . . 50 )
According to above formula, host computer can calculate the resistance of every road thermistor.Because sampling rate fixes, namely the time of sampling is after being known.At thermistor circulation time in high and low temperature environment, we can draw out each road thermistor Ri-t (i=1,2,3...50) resistance time response curve by host computer.
For negative tempperature coefficient thermistor, first by being set in target temperature T i=T a+ (T b-T a) * 0.632 (T wherein aBe low temperature tank temperature, T bTemperature for high-temperature water channel) zero power resistance the time, then host computer adopts certain algorithm, calculates the thermal time constant τ that the environmental change of NTC thermistor causes according to " directly-heated type negative temperature coefficient thermistor part 1: general specification " (GB/T 6663.1-2007/IEC 60539-1:2002) of Standardization Administration of China issue.
DSP is uploaded to host computer with the data packing, host computer provides man-machine communication's friendly interface, it communicates by RS232 interface and DSP, and epigynous computer section is mainly used in data receiver, makes the resistance time curve of thermistor and according to the calculation of parameter thermal time constant that arranges according to data.The mode that this proving installation had not only comprised traditional Real-Time Monitoring mode but also provided a kind of random sampling to detect is so that whole system more flexibly and science.
As shown in Figure 4, accurate sampling resistor array is comprised of metal film sampling resistor, high-speed analog switch, the voltage signal amplifying circuit of relay, a plurality of 0.1% precision; Sampling resistor one end accesses the AD modular converter of measuring with control module after being connected to the voltage signal amplifying circuit by high-speed analog switch again; Three resistance values that Control is connected with thermistor.On circuit design, the easily plug of accurate sampling resistor array module has strengthened the ease for use of this covering device.The DS2E-M-DC3V that relay adopts Panasonic (Panasonic) to make, for suppressing the common-mode signal in the test loop, voltage amplifier circuit adopts instrumentation amplifier AD620.DSP can control relay, when control No. one relay adhesive, be about to the test loop that sampling resistor seals in 50 road thermistors, that high-speed analog switch is selected is the NLAS4684 of ONNN (ON Semiconductor) company, this analog switch has 0.5 Ω conducting resistance, and conducting speed is fast.DSP controls this analog switch of 50 tunnel, selects concrete a certain road access voltage amplifier circuit, and the voltage signal that is exaggerated is subsequently finally gathered by DSP via the AD modular converter.
Whole testing process is as follows: connect water pipe and water supply for the solenoid valve of self water feeding unit, give two cylinder air feed and pluggeds, set high temperature and the cryogenic temperature of two tanks by the temperature-controlled cabinet of Water Tank with Temp.-controlled.By measurement and control module the resistance of each road thermistor of sampling resistor array element series connection access and interval time and the cycle index of burn-in test process are set.Open upper computer software, the resistance value when setting the medium temperature that is used for thermal time constant calculating.By the switch on measurement and the control module, open test at last.In the test process, DSP can sample to the voltage on 50 road sampling resistors with a fixing sampling rate, particularly, DSP controls first 50 path analoging switch and selects wherein one road signal conduction, after signal process voltage amplification module, pass through again the AD modular converter of measurement and control module, DSP reads the data after the AD conversion, and then disconnect this path analoging switch, closed next path analoging switch also gathers the data on next road, gather 50 the tunnel successively, send upper computer software to by the RS232 serial ports after at last Packet Identifier being sticked in these data packings, upper computer software in test process with these deposit data in the file of user's appointment, on the other hand, cylinder adopts MGPL25-150-Z73 and the MSQA30R-A93 of Japanese SMC company, and DSP drives telescopic cylinder and oscillating cylinder according to the interval time of setting and cycle index, makes the sample loop test in the high-low-temperature groove that is articulated in above the sample support platform (having increased the sample support platform) 9.In the measuring process and after the test, the user can check the R-t resistance time curve of specifying the thermistor sample by upper computer software, calculates the mean value of thermal time constant in the whole process.

Claims (4)

1. a thermistor wears out and the thermal time constant automatic testing equipment, comprise high-temperature water channel mechanism, water at low temperature groove mechanism, sample position switching mechanism, self water feeding unit and measurement and control module, be provided with the sample position switching mechanism between the two tank mechanisms, two tank mechanisms connect respectively a self water feeding unit, measure and control module electrical connection sample; Described sample position switching mechanism comprises telescopic cylinder, oscillating cylinder and sample support platform from the bottom up successively, sample is articulated on the sample support platform, the sample support platform is connected to leader, and the wiring of sample is passed leader and is connected with measurement and control module; Described measurement and control module comprise slave computer, AD modular converter, program control sampling resistor array and host computer, host computer is to the slave computer transfer control instruction, slave computer is controlled telescopic cylinder, oscillating cylinder according to steering order and make the resistance tandem compound in program control sampling resistor array, and the resistance string joint group that obtains is electrically connected sample; The sample energising, the voltage of resistance string joint group sends host computer to through AD modular converter and slave computer successively, and host computer is for data processing and obtains thermistor resistance-time curve, and then determines thermistor ageing properties and thermal time constant according to this curve.
2. thermistor according to claim 1 wears out and the thermal time constant automatic testing equipment, it is characterized in that, described high temperature and water at low temperature groove mechanism comprise tank, processor, signal condition module and temperature sampling module, send processor to after the water temperature signal process signal condition module of temperature sampling module collection, processor carries out water temperature control according to this signal and guarantees that tank is in temperature constant state.
3. the aging and thermal time constant automatic testing equipment of thermistor according to claim 2 is characterized in that described high temperature and water at low temperature groove mechanism also comprise the stirring motor of laying near tank.
4. the aging and thermal time constant automatic testing equipment of thermistor according to claim 1 is characterized in that described self water feeding unit comprises liquid level relay and the solenoid valve that joins.
CN 201110164592 2011-06-17 2011-06-17 Device for automatically testing aging performance and thermal time constant of thermistor Expired - Fee Related CN102331444B (en)

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CN105319469B (en) * 2015-11-24 2018-03-16 中国人民解放军63655部队 A kind of thermistor dynamic characteristic measuring device and method
CN105841940A (en) * 2016-03-29 2016-08-10 中国计量学院 Thermal expansion valve time constant testing device and testing method
CN107976265A (en) * 2017-11-27 2018-05-01 天津航空机电有限公司 A kind of time constant test system and method for temperature sensor
CN109839541B (en) * 2017-11-27 2021-01-08 上海交通大学 Measuring device for measuring time constant characteristic of thermistor type sensor
CN111024130A (en) * 2020-01-03 2020-04-17 中国船舶重工集团公司第七0七研究所 Fiber-optic gyroscope reliability analysis system and method for judging scale factor of fiber-optic gyroscope
CN113324679A (en) * 2021-05-31 2021-08-31 新疆维吾尔自治区计量测试研究院 Thermal resistance time constant measuring method and device

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CN202383215U (en) * 2011-12-14 2012-08-15 华中科技大学 Device for testing ageing and thermal time constant of multichannel thermistor

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