CN213120914U - Intelligent thermistor characteristic research tester - Google Patents
Intelligent thermistor characteristic research tester Download PDFInfo
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- CN213120914U CN213120914U CN202022407307.7U CN202022407307U CN213120914U CN 213120914 U CN213120914 U CN 213120914U CN 202022407307 U CN202022407307 U CN 202022407307U CN 213120914 U CN213120914 U CN 213120914U
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Abstract
The utility model provides an intelligent thermistor characteristic research tester, use this tester when carrying out thermistor's characteristic research experiment, place thermistor in the water tank, heat/refrigerate through singlechip control heating device/refrigerating plant to the water in the water tank respectively, and then realize the temperature control of waiting to detect thermistor, when reaching the detection temperature, the singlechip starts the A/D conversion equipment in step and carries out thermistor's resistance detection, realize resistance and temperature one-to-one, reduce the error, after the resistance detection of a temperature is finished, the singlechip controls refrigerating plant and refrigerates, accelerate thermistor's cooling rate, shorten the detection cycle of whole experiment; the tester has the advantages of simple structure, reasonable design, convenient use, short detection period, small error and the like.
Description
Technical Field
The utility model discloses a technical field that relates to thermistor characteristic test especially relates to an intelligent thermistor characteristic research test appearance.
Background
In the physical teaching process, in order to enable students to deeply understand the performance of the thermistor, the students are organized to perform a performance test of the thermistor each time when the performance of the thermistor is studied, and the test mainly aims to: the student can know the temperature characteristic of the thermistor.
In the past, when a performance test of the thermistor is performed, the temperature of the thermistor is firstly increased until a preset temperature is reached, the corresponding resistance value of the thermistor at the temperature is measured and recorded, then the thermistor is waited to be naturally cooled, the resistance value corresponding to the thermistor is measured once when the temperature of the thermistor is reduced by 1 ℃, the resistance value is recorded, finally, a temperature characteristic curve of the thermistor is drawn according to a plurality of recorded temperature values and corresponding resistance values, and the test is finished.
In the test process, the temperature of the thermistor is completely reduced by natural cooling, so that the test period is long, each time the temperature measurement and the resistance measurement are not performed synchronously, and the temperature of the thermistor is changed when the resistance measurement is performed, so that the measurement error is large.
Therefore, how to develop a novel experimental instrument for researching the characteristics of the thermistor becomes a problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an intelligent thermistor characteristic research test appearance to at least, when solving in the past at thermistor's characteristic research experiment, there is the problem that test cycle is long, the error is big.
The utility model provides a technical scheme specifically does, an intelligent thermistor characteristic research test appearance, this tester includes: the system comprises a water tank, a heating device, a refrigerating device, a circulating pump, a temperature sensor, an A/D conversion device, an input device, a single chip microcomputer and a display screen;
the water tank is filled with medium water;
the heating device is arranged in the water tank and used for heating medium water in the water tank;
the refrigerating device is arranged in the water tank and is used for cooling medium water in the water tank;
the circulating pump is arranged in the water tank and is used for accelerating the circulation of medium water in the water tank;
the temperature sensor is arranged in the water tank and is used for detecting the temperature of medium water in the water tank;
the A/D conversion device is arranged outside the water tank and used for detecting the resistance value of the thermistor;
the input device is arranged outside the water tank and used for inputting setting information;
the single chip microcomputer is arranged outside the water tank, the input end of the single chip microcomputer is respectively connected with the output end of the temperature sensor, the output end of the A/D conversion device and the output end of the input device, and the output end of the single chip microcomputer is respectively connected with the control end of the heating device, the control end of the refrigerating device, the control end of the circulating pump, the control end of the temperature sensor, the control end of the A/D conversion device and the input end of the display screen.
Preferably, the heating device is an electric heating tube.
Further preferably, the refrigerating device is a semiconductor refrigerating sheet.
Further preferably, the water tank is a stainless steel water tank.
Further preferably, the display screen is an SSD-1306LCD screen.
The utility model provides an intelligent thermistor characteristic research test appearance, use this tester when carrying out thermistor's characteristic research experiment, place thermistor in the water tank, heat/refrigerate through singlechip control heating device/refrigerating plant to the water in the water tank respectively, and then realize waiting to detect thermistor's temperature control, when reaching the detection temperature, singlechip synchronous start AD conversion equipment carries out thermistor's resistance and detects, realize resistance and temperature one-to-one, reduce the error, after the resistance detection of a temperature is ended simultaneously, singlechip chance control refrigerating plant refrigerates, accelerate thermistor's cooling rate, shorten whole experimental detection cycle.
The utility model provides an intelligent thermistor characteristic research test appearance has advantages such as simple structure, reasonable in design, convenient to use, detection cycle are short, the error is little.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of the intelligent thermistor characteristic research tester provided by the embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
In order to solve the problems of long test period and large error in the conventional thermistor characteristic research test, the embodiment provides an intelligent thermistor characteristic research tester, which is mainly composed of a water tank, a heating device 1, a refrigerating device 2, a circulating pump 3, a temperature sensor 4, an A/D conversion device 5, an input device 6, a singlechip 7 and a display screen 8, and referring to fig. 1, wherein, when in use, the water tank is filled with medium water, the heating device 1 is arranged in the water tank and used for heating the medium water in the water tank, the refrigerating device 2 is arranged in the water tank and used for cooling the medium water in the water tank, the circulating pump 3 is arranged in the water tank and used for accelerating the circulation of the medium water in the water tank, the temperature sensor 4 is arranged in the water tank and used for detecting the temperature of the medium water in the water tank, the AD conversion device 5 is arranged outside the water tank and used for detecting the resistance value of the thermistor, the input device 6 is arranged outside the water tank and used for inputting setting information, the single chip microcomputer 7 is arranged outside the water tank, the input end of the single chip microcomputer 7 is respectively connected with the output end of the temperature sensor 4, the output end of the AD conversion device 5 is connected with the output end of the input device 6, the output end of the single chip microcomputer 7 is respectively connected with the control end of the heating device 1, the control end of the refrigerating device 2, the control end of the circulating pump 3, the control end of the temperature sensor 4, the control end of the AD conversion device 5 and the input end of the display screen 8.
The intelligent thermistor characteristic research tester has the following specific working process: after the thermistor to be detected is placed in the water tank and installed in place, the temperature range to be detected by the thermistor and the detected temperature interval are input into the input device, and the detection is started after the temperature range and the detected temperature interval are ready. Firstly, the singlechip controls the heating device, the circulating pump and the temperature sensor to start, wherein the heating device is used for heating medium water in the water tank, the circulating pump is used for promoting the water circulation in the water tank to keep the water temperature in the water tank uniform, the temperature sensor is used for detecting the water temperature in the water tank until the temperature value detected by the temperature sensor reaches the highest temperature value set by the input device, at the moment, the singlechip controls the heating device to stop heating and synchronously starts the A/D conversion device to detect the resistance value of the thermistor, after the singlechip receives the resistance value detected by the A/D conversion device, the singlechip controls the refrigerating device to start until the temperature value detected by the temperature sensor reaches the next temperature value, the singlechip controls the refrigerating device to stop working and synchronously starts the A/D conversion device to detect the resistance value of the thermistor, and after the single chip microcomputer receives the resistance value of the resistor detected by the A/D conversion device, the refrigerating device is controlled to start again, so that the operation is repeated until the resistance values corresponding to all the temperature points are detected, the single chip microcomputer fits and generates a temperature performance curve of the thermistor according to all the detected temperature values and the corresponding resistance values, and the temperature performance curve is sent to the display screen and displayed through the display screen.
The method for generating the curve by fitting the point values in the single chip microcomputer is the existing method, and does not involve any technical improvement.
Adopt above-mentioned intelligent thermistor characteristic research test appearance to carry out thermistor's temperature performance and detect, whole process easy operation through singlechip and temperature sensor's cooperation, can realize that temperature and resistance detect almost to go on simultaneously, avoids because the measuring error that the two time difference leads to, and the process of cooling down is assisted by cooling device and is gone on in addition, can accelerate cooling speed, shortens test period.
Among the above-mentioned intelligent thermistor characteristic research test appearance, heating device 1 can select electric heating pipe, and the selection of material is convenient, and is with low costs moreover.
Among the above-mentioned intelligent thermistor characteristic research test appearance, refrigerating plant 2 can select the semiconductor refrigeration piece, has the fast advantage of refrigeration cooling.
Among the above-mentioned intelligent thermistor characteristic research test appearance, in order to prolong the life of water tank, as technical scheme's improvement, the water tank can select the stainless steel water tank.
In the intelligent thermistor characteristic research tester, the display screen 8 can be an SSD-1306LCD screen.
The characteristics of the thermistor are studied by using the intelligent thermistor characteristics tester provided by the conventional method and the above embodiment, as follows:
the traditional mode is as follows: the temperature is detected, after the temperature is detected, the resistance value of the thermistor is detected by using a universal meter, and then recording is carried out.
Intelligent thermistor characteristic research tester: the temperature of water is raised to 45 ℃ by using a heating device, then the temperature is reduced by using a refrigerating device, a temperature reduction point is arranged at every 1 ℃, the temperature is sequentially reduced from 45 ℃ to 35 ℃, eleven groups of data of the temperature T and the corresponding thermistor resistance value Rt are stored in a single chip microcomputer for data processing, and then the fitted thermistor characteristic curve is displayed on a display screen.
Data measured in a conventional manner, as shown in table 1:
table 1:
| T/K | 318 | 317 | 316 | 315 | 314 | 313 | 312 | 311 | 310 | 309 | 308 |
| Rt/kΩ | 21.83 | 22.73 | 23.56 | 24.57 | 25.59 | 26.61 | 27.67 | 28.82 | 29.95 | 31.14 | 32.68 |
the data measured by the intelligent thermistor characteristic research tester are shown in table 2:
table 2:
| T/K | 318 | 317 | 316 | 315 | 314 | 313 | 312 | 311 | 310 | 309 | 308 |
| Rt/Ω | 21.826 | 22.723 | 23.560 | 24.569 | 2.5588 | 26.603 | 27.667 | 28.814 | 29.961 | 31.143 | 32.675 |
the results of the analysis of the data obtained for both detection modes are shown in table 3:
table 3:
| thermistor parameters | B | A | α |
| Before improvement | 3956k | 0.0156 | -4.04％ |
| After improvement | 3953k | 0.0158 | -4.03％ |
Remarking: the standard value of B is 3950 k.
Through the test comparison, the intelligent thermistor characteristic research tester provided by the embodiment is adopted to detect the temperature performance of the thermistor, the test operation is simple, the relation between the resistance value and the temperature of the thermistor is easy to understand, the time error is eliminated, and the data is recorded in real time.
The intelligent thermistor characteristic research tester can be used as an independent experiment item of the thermistor temperature characteristic relation, and can also obtain the corresponding characteristic data of the piezoresistor and the gas sensitive resistor according to a similar principle. Meanwhile, the improved instrument is simple to operate, has small error and can be applied to later experimental teaching and even scientific research work.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims (5)
1. An intelligent thermistor characteristic research tester is characterized by comprising: the system comprises a water tank, a heating device (1), a refrigerating device (2), a circulating pump (3), a temperature sensor (4), an A/D conversion device (5), an input device (6), a singlechip (7) and a display screen (8);
the water tank is filled with medium water;
the heating device (1) is arranged in the water tank and used for heating medium water in the water tank;
the refrigerating device (2) is arranged in the water tank and is used for cooling medium water in the water tank;
the circulating pump (3) is arranged in the water tank and is used for accelerating the circulation of medium water in the water tank;
the temperature sensor (4) is arranged in the water tank and is used for detecting the temperature of medium water in the water tank;
the A/D conversion device (5) is arranged outside the water tank and used for detecting the resistance value of the thermistor;
the input device (6) is arranged outside the water tank and used for inputting setting information;
singlechip (7) sets up the outside of water tank, the input of singlechip (7) respectively with the output of temperature sensor (4), the output of AD conversion device (5) with the output of input device (6) is connected, the output of singlechip (7) respectively with the control end of heating device (1), the control end of refrigerating plant (2), the control end of circulating pump (3), the control end of temperature sensor (4), the control end of AD conversion device (5) and the input of display screen (8) is connected.
2. The intelligent thermistor characteristic research tester according to claim 1, characterized in that the heating device (1) is an electric heating tube.
3. The intelligent thermistor characteristic research tester according to claim 1, characterized in that the refrigerating device (2) is a semiconductor refrigerating sheet.
4. The intelligent thermistor characteristic study tester according to claim 1, wherein the water tank is a stainless steel water tank.
5. The intelligent thermistor characteristic research tester according to claim 1, characterized in that the display screen (8) is an SSD-1306LCD screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022407307.7U CN213120914U (en) | 2020-10-26 | 2020-10-26 | Intelligent thermistor characteristic research tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022407307.7U CN213120914U (en) | 2020-10-26 | 2020-10-26 | Intelligent thermistor characteristic research tester |
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| Publication Number | Publication Date |
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| CN213120914U true CN213120914U (en) | 2021-05-04 |
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| CN202022407307.7U Active CN213120914U (en) | 2020-10-26 | 2020-10-26 | Intelligent thermistor characteristic research tester |
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