CN1381711A - Temp measurer of electronic clinical thermometer - Google Patents
Temp measurer of electronic clinical thermometer Download PDFInfo
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- CN1381711A CN1381711A CN 02113113 CN02113113A CN1381711A CN 1381711 A CN1381711 A CN 1381711A CN 02113113 CN02113113 CN 02113113 CN 02113113 A CN02113113 A CN 02113113A CN 1381711 A CN1381711 A CN 1381711A
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Abstract
A temp. measurer of electronic clinic thermometer is composed of temp. measuring probe (thermosensitive semiconductor diode) and signal processing circuit. Its advantages are high speed and correctness, and the angle of temp. measuring probe variable between 30-90 deg..
Description
Technical field
The present invention relates to a kind of electronic thermometer.
Background technology
Mercury clinical thermometer is a measurement of bldy temperature instrument the most frequently used in present China hospital and the family, though mercury clinical thermometer have reading inconvenience, Measuring Time long, use uneasy congruent factor substitute and used for a long time because its volume is little, cost is low and do not have better product.As everyone knows, mercury can be evaporated to mercuryvapour at normal temperatures, after humans and animals sucks the mercury poisoning reaction can take place, and these mercury products are produced year in year out and used, and can cause the pollution to atmosphere and water quality, seriously jeopardize existent environment of people.In recent years along with the progress of medical science, the application of electronic technology is also more and more general, medicine equipment in conjunction with electronic technology has obtained using widely especially, therefore electronic thermometer has appearred, has temperature-sensing element on the sensing head of electronic thermometer, after the processing of resistance capacitance mode of oscillation, the temperature of measuring is presented on the LCD, but influence because of factors such as structure and measurement environment, finish from beginning to measure to measure, need exhaust the considerable time, use inconvenient, especially many infants can't stand the measurement of long period and cause and cry and scream, thereby influence the measurement of body temperature.Another kind of electronic thermometer--ear thermometer then utilizes and uses the infrared measurement of temperature principle to measure, but can not enter common people family because of costing an arm and a leg, and also can make infrared sensor can not align ear-drum because of earwax and various reasons such as take measurement of an angle, and causes measured deviation.
Summary of the invention
The objective of the invention is: a kind of temperature measuring equipment that a kind of electronic thermometer is provided is provided, this device uses semiconductor temperature-sensitive diode as temperature-sensing element, temperature measuring head adopts the standard plug receptacle to connect, convenient and flexible installation, operation easy to operate are changed, have the characteristics fast and accurately of measuring, and can rotate between the 30-90 degree, each angle can be fixed, and can be used for measuring a mouthful temperature, armpit temperature and anus temperature.
Technical scheme of the present invention is: a kind of temperature measuring equipment of electronic thermometer, comprise temperature measuring head and signal processing circuit, and described temperature measuring head is a semiconductor temperature-sensitive diode.
The further technical scheme of the present invention is: a kind of temperature measuring equipment of electronic thermometer, comprise temperature measuring head and signal processing circuit, and described temperature measuring head is a semiconductor temperature-sensitive diode; Described signal processing circuit comprises four-operational amplifier U3A, U3B, U3C, U3D, U3A is connected into a voltage follower, positive is input as the reference data voltage of U3A port, the voltage of output point A is reference voltage, resistance R 7, R8, R9 is divider resistance, R9 is a variable resistor, resistance is regulated in debugging as error compensation, operational amplifier U3B and U3D connect into two voltage followers respectively, the output voltage that B point and D are ordered is consistent with their voltage of input end respectively, guarantee that the signal that sensor takes place changes undistorted, operational amplifier U3C and resistance R 10, R11, R12, R13 has formed differential amplifier, has potential difference (PD) between the input end of amplification, can remove common-mode noise, the pure signal of amplification sensor only, R12 is a negative feedback resistor, prevent that signal amplification factor is excessive and unstable, the output of U3C is the sampled signal of handling.
Advantage of the present invention is:
1. temperature measuring head of the present invention is the PN junction that utilizes Semiconducting Silicon Materials to make, it is semiconductor temperature-sensitive diode, has negative coefficient feature, forward voltage drop reduces when being the temperature rising, because the volume of PN junction can be done very for a short time, adds epoxy encapsulation, make this temperature sensor have extremely short time constant (τ＜3 second), by the sampled voltage signal, obtain and the corresponding temperature value of voltage, whole process finishes in second at 3-5.
2. temperature measuring head thermometric speed of the present invention is fast, precision is high, adopts the standard plug receptacle to connect, and convenient and flexible installation, operation easy to operate are changed, and can rotate between the 30-90 degree, and each angle can be fixed, and can be used for measuring a mouthful temperature, armpit temperature and anus temperature.
Description of drawings
The invention will be further described below in conjunction with embodiment:
Fig. 1 is circuit theory diagrams of the present invention;
Wherein: 1 temperature measuring head; 2 signal processing circuits.
Embodiment
Embodiment: as shown in Figure 1, a kind of temperature measuring equipment of electronic thermometer, comprise temperature measuring head (1) and signal processing circuit (2), described temperature measuring head (1) is the PN junction that utilizes Semiconducting Silicon Materials to make, it is semiconductor (temperature-sensitive) diode, has negative coefficient feature, forward voltage drop reduces when being the temperature rising, because the volume of PN junction can be done very for a short time, add epoxy encapsulation, make this temperature sensor have extremely short time constant (τ＜3 second), by the sampled voltage signal, obtain and the corresponding temperature value of voltage, whole process finishes in second at 3-5.
Signal processing circuit (2) is by four-operational amplifier U3A, U3B, U3C, the LM of U3D (V) 324 and peripheral circuit are formed, U3A is connected into a voltage follower, also claim buffer amplifier, positive is input as the reference data voltage of U3A port, the voltage of output point A can not change with the variation of temp .-sensitive diodes, be reference voltage, resistance R 7, R8, R9 is divider resistance, R9 is a variable resistor, can be used as the error compensation debugging and regulate resistance, operational amplifier U3B and U3D connect into two voltage followers respectively, the output voltage that B point and D are ordered is consistent with their voltage of input end respectively, guarantee that the signal that sensor takes place changes undistorted, operational amplifier U3C and resistance R 10, R11, R12, R13 has formed differential amplifier, has potential difference (PD) between the input end of amplification, can remove common-mode noise, the pure signal of amplification sensor only, R12 is a negative feedback resistor, prevent that signal amplification factor is excessive and unstable, the output of U3C is the sampled signal of handling, be input to the input port of control circuit, again through microprocessor processes, the result exports from LCD.
Claims (2)
1. the temperature measuring equipment of an electronic thermometer comprises temperature measuring head (1) and signal processing circuit (2), it is characterized in that: described temperature measuring head (1) is a semiconductor temperature-sensitive diode.
2. the temperature measuring equipment of electronic thermometer according to claim 1, it is characterized in that: described signal processing circuit (2) comprises four-operational amplifier U3A, U3B, U3C, U3D, U3A is connected into a voltage follower, positive is input as the reference data voltage of U3A port, the voltage of output point A is reference voltage, resistance R 7, R8, R9 is divider resistance, R9 is a variable resistor, resistance is regulated in debugging as error compensation, operational amplifier U3B and U3D connect into two voltage followers respectively, the output voltage that B point and D are ordered is consistent with their voltage of input end respectively, guarantee that the signal that sensor takes place changes undistorted, operational amplifier U3C and resistance R 10, R11, R12, R13 has formed differential amplifier, has potential difference (PD) between the input end of amplification, can remove common-mode noise, the pure signal of amplification sensor only, R12 is a negative feedback resistor, prevents that signal amplification factor is excessive and unstable, and the output of U3C is the sampled signal of handling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02113113 CN1381711A (en) | 2002-05-31 | 2002-05-31 | Temp measurer of electronic clinical thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02113113 CN1381711A (en) | 2002-05-31 | 2002-05-31 | Temp measurer of electronic clinical thermometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1381711A true CN1381711A (en) | 2002-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02113113 Pending CN1381711A (en) | 2002-05-31 | 2002-05-31 | Temp measurer of electronic clinical thermometer |
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| CN (1) | CN1381711A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8120601B2 (en) | 2008-02-15 | 2012-02-21 | Casio Computer Co., Ltd. | Display drive apparatus, display apparatus and drive control method thereof |
| CN102908151A (en) * | 2012-11-05 | 2013-02-06 | 北京超思电子技术股份有限公司 | Blood oxygen measuring instrument capable of measuring body temperature |
| CN103743497A (en) * | 2013-11-21 | 2014-04-23 | 成都市宏山科技有限公司 | Switch cabinet bus joint temperature rise monitoring apparatus based on sound surface wave sensor |
| CN103815899A (en) * | 2014-03-07 | 2014-05-28 | 华中科技大学 | Non-contacting electrocardio electrode module and electrocardiogram detector |
| CN105491258A (en) * | 2016-01-15 | 2016-04-13 | 鲁爱武 | Remote affection interaction control system and near affection interaction control system |
| CN107659311A (en) * | 2017-09-27 | 2018-02-02 | 航天科技控股集团股份有限公司 | A kind of vehicle-mounted AD Acquisition Circuit of wide scope |
| CN109861650A (en) * | 2019-02-27 | 2019-06-07 | 四川爱创科技有限公司 | The operational amplification circuit of adjustable reference voltage value |
| CN113520407A (en) * | 2021-07-14 | 2021-10-22 | 深圳英智科技有限公司 | Electroencephalogram amplifier |
-
2002
- 2002-05-31 CN CN 02113113 patent/CN1381711A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8120601B2 (en) | 2008-02-15 | 2012-02-21 | Casio Computer Co., Ltd. | Display drive apparatus, display apparatus and drive control method thereof |
| CN102908151A (en) * | 2012-11-05 | 2013-02-06 | 北京超思电子技术股份有限公司 | Blood oxygen measuring instrument capable of measuring body temperature |
| CN103743497A (en) * | 2013-11-21 | 2014-04-23 | 成都市宏山科技有限公司 | Switch cabinet bus joint temperature rise monitoring apparatus based on sound surface wave sensor |
| CN103815899A (en) * | 2014-03-07 | 2014-05-28 | 华中科技大学 | Non-contacting electrocardio electrode module and electrocardiogram detector |
| CN103815899B (en) * | 2014-03-07 | 2017-01-11 | 华中科技大学 | Non-contacting electrocardio electrode module and electrocardiogram detector |
| CN105491258A (en) * | 2016-01-15 | 2016-04-13 | 鲁爱武 | Remote affection interaction control system and near affection interaction control system |
| CN107659311A (en) * | 2017-09-27 | 2018-02-02 | 航天科技控股集团股份有限公司 | A kind of vehicle-mounted AD Acquisition Circuit of wide scope |
| CN109861650A (en) * | 2019-02-27 | 2019-06-07 | 四川爱创科技有限公司 | The operational amplification circuit of adjustable reference voltage value |
| CN113520407A (en) * | 2021-07-14 | 2021-10-22 | 深圳英智科技有限公司 | Electroencephalogram amplifier |
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