CN204971238U - Portable temperature sensor - Google Patents
Portable temperature sensor Download PDFInfo
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- CN204971238U CN204971238U CN201520749457.2U CN201520749457U CN204971238U CN 204971238 U CN204971238 U CN 204971238U CN 201520749457 U CN201520749457 U CN 201520749457U CN 204971238 U CN204971238 U CN 204971238U
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Abstract
The utility model discloses a portable temperature sensor, including resistance R1, potentiometre RP1, potentiometre RP2, chip IC2 and voltmeter P, resistance R1 one end is connecting resistance R3 respectively, chip IC3 pin 8, chip IC2's pin 8 and chip IC4's pin 8, resistance R1's other end connecting resistance R2's the other end and chip IC2's pin 3, chip IC2's pin 2 connecting resistance R4, resistance R5, resistance R8, resistance R10, voltmeter P's interface 2 and chip IC2's pin 7, resistance R3's other end connecting resistance R6 summation potential ware RP1's a stiff end, chip IC3's pin 3 is connected to potentiometre RP1's slip end, another stiff end connecting resistance R4's of potentiometre RP1 the other end, diode D1's the negative pole and resistance R5's the other end are connected to chip IC3's pin 2. The utility model discloses portable temperature sensor circuit structure is simple, and is with low costs, small, especially adapted using widely.
Description
Technical field
This utility model relates to a kind of temperature sensor, specifically a kind of Portable temperature sensor.
Background technology
In clinical medicine, body temperature is an important human body physiological parameter.It is the basic feature of human life activity, is also one of whether normal important indicator of observation function of human body.So clinical thermometer be no matter daily health caring and or clinical diagnosis in, be all absolutely necessary measuring for medical utensil.Traditional mercury clinical thermometer is the temperature that the character of expanding with heat and contract with cold according to liquid measures human body, although its low price, stable performance, also there is many drawbacks.
Utility model content
The purpose of this utility model is to provide a kind of Portable temperature sensor, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, this utility model provides following technical scheme:
A kind of Portable temperature sensor, comprise resistance R1, potentiometer RP1, potentiometer RP2, chip IC 2 and voltmeter P, described resistance R1 one end is contact resistance R3 respectively, chip IC 3 pin 8, the pin 8 of chip IC 2 and the pin 8 of chip IC 4, the other end of other end contact resistance R2 of resistance R1 and the pin 3 of chip IC 2, the pin 2 contact resistance R4 of chip IC 2, resistance R5, resistance R8, resistance R10, the interface 2 of voltmeter P and the pin 7 of chip IC 2, the other end contact resistance R6 of resistance R3 and a stiff end of potentiometer RP1, the sliding end of potentiometer RP1 connects the pin 3 of chip IC 3, the other end of another stiff end contact resistance R4 of potentiometer RP1, the pin 2 of chip IC 3 connects the negative electrode of diode D1 and the other end of resistance R5, pin 1 ground connection of chip IC 3, the pin 7 contact resistance R7 of chip IC 3 and the anode of diode D1, the other end of other end contact resistance R8 of resistance R6 and the pin 3 of chip IC 4, the other end of the pin 2 contact resistance R7 of chip IC 4 and resistance R9, the other end of resistance R9 connects a stiff end of potentiometer RP1 and the pin 7 of chip IC 4, the sliding end of potentiometer RP1 connects the interface 1 of voltmeter P, the other end of another stiff end contact resistance R10 of potentiometer RP1.
As preferred version of the present utility model: described chip IC 2, chip IC 3 and chip IC 4 are LM393 voltage comparator.
As preferred version of the present utility model: the model of described diode D1 is IN4148.
Compared with prior art, the beneficial effects of the utility model are: this utility model Portable temperature sensor electrical line structure is simple, and cost is low, and volume is little, is applicable to very much promoting the use of.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of Portable temperature sensor.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, be clearly and completely described the technical scheme in this utility model embodiment, obviously, described embodiment is only this utility model part embodiment, instead of whole embodiments.Based on the embodiment in this utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of this utility model protection.
Refer to Fig. 1, a kind of Portable temperature sensor, comprise resistance R1, potentiometer RP1, potentiometer RP2, chip IC 2 and voltmeter P, resistance R1 one end is contact resistance R3 respectively, chip IC 3 pin 8, the pin 8 of chip IC 2 and the pin 8 of chip IC 4, the other end of other end contact resistance R2 of resistance R1 and the pin 3 of chip IC 2, the pin 2 contact resistance R4 of chip IC 2, resistance R5, resistance R8, resistance R10, the interface 2 of voltmeter P and the pin 7 of chip IC 2, the other end contact resistance R6 of resistance R3 and a stiff end of potentiometer RP1, the sliding end of potentiometer RP1 connects the pin 3 of chip IC 3, the other end of another stiff end contact resistance R4 of potentiometer RP1, the pin 2 of chip IC 3 connects the negative electrode of diode D1 and the other end of resistance R5, pin 1 ground connection of chip IC 3, the pin 7 contact resistance R7 of chip IC 3 and the anode of diode D1, the other end of other end contact resistance R8 of resistance R6 and the pin 3 of chip IC 4, the other end of the pin 2 contact resistance R7 of chip IC 4 and resistance R9, the other end of resistance R9 connects a stiff end of potentiometer RP1 and the pin 7 of chip IC 4, the sliding end of potentiometer RP1 connects the interface 1 of voltmeter P, the other end of another stiff end contact resistance R10 of potentiometer RP1.
Chip IC 2, chip IC 3 and chip IC 4 are LM393 voltage comparator.
The model of diode D1 is IN4148.
Operation principle of the present utility model is: any one common diode, can as the sensing element of excellent, that there is a certain precision electronic sensor, because well-known, diode is when temperature often raises 1 degree, and its forward voltage drop will reduce 2mV.Refer to Fig. 1, in circuit, a constant reference voltage is added in the pin 2 of chip IC 3, pin 2 access diode D1 and resistance R5 of chip IC 3.The electric current flowing through diode D1 also flows through resistance R5 simultaneously, therefore on resistance R5, maintains constant pressure drop.Like this when IC3 output end voltage changes, it may be only cause because of variations in temperature caused by the change of diode D1 forward voltage drop, and namely the change of IC3 output voltage is proportional to the variations in temperature of diode D1.The reference voltage of IC3 is provided by three terminal regulator IC1.The output voltage of IC3 amplifies through IC4 again.IC4 with IC3 is identical, and its 3 pin also keeps constant level.The selection of resistance R5 and resistance R8 resistance should make the 0V of voltmeter P correspond to ambient temperature 0 degree.
Claims (3)
1. a Portable temperature sensor, comprise resistance R1, potentiometer RP1, potentiometer RP2, chip IC 2 and voltmeter P, it is characterized in that, described resistance R1 one end is contact resistance R3 respectively, chip IC 3 pin 8, the pin 8 of chip IC 2 and the pin 8 of chip IC 4, the other end of other end contact resistance R2 of resistance R1 and the pin 3 of chip IC 2, the pin 2 contact resistance R4 of chip IC 2, resistance R5, resistance R8, resistance R10, the interface 2 of voltmeter P and the pin 7 of chip IC 2, the other end contact resistance R6 of resistance R3 and a stiff end of potentiometer RP1, the sliding end of potentiometer RP1 connects the pin 3 of chip IC 3, the other end of another stiff end contact resistance R4 of potentiometer RP1, the pin 2 of chip IC 3 connects the negative electrode of diode D1 and the other end of resistance R5, pin 1 ground connection of chip IC 3, the pin 7 contact resistance R7 of chip IC 3 and the anode of diode D1, the other end of other end contact resistance R8 of resistance R6 and the pin 3 of chip IC 4, the other end of the pin 2 contact resistance R7 of chip IC 4 and resistance R9, the other end of resistance R9 connects a stiff end of potentiometer RP1 and the pin 7 of chip IC 4, the sliding end of potentiometer RP1 connects the interface 1 of voltmeter P, the other end of another stiff end contact resistance R10 of potentiometer RP1.
2. a kind of Portable temperature sensor according to claim 1, is characterized in that, described chip IC 2, chip IC 3 and chip IC 4 are LM393 voltage comparator.
3. a kind of Portable temperature sensor according to claim 1, is characterized in that, the model of described diode D1 is IN4148.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520749457.2U CN204971238U (en) | 2015-09-25 | 2015-09-25 | Portable temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520749457.2U CN204971238U (en) | 2015-09-25 | 2015-09-25 | Portable temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204971238U true CN204971238U (en) | 2016-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520749457.2U Active CN204971238U (en) | 2015-09-25 | 2015-09-25 | Portable temperature sensor |
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| Country | Link |
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| CN (1) | CN204971238U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106476750A (en) * | 2016-12-23 | 2017-03-08 | 广西大学 | A kind of vehicle electronics management information system |
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2015
- 2015-09-25 CN CN201520749457.2U patent/CN204971238U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106476750A (en) * | 2016-12-23 | 2017-03-08 | 广西大学 | A kind of vehicle electronics management information system |
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