CN205679331U - Double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, - Google Patents
Double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, Download PDFInfo
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- CN205679331U CN205679331U CN201620625709.5U CN201620625709U CN205679331U CN 205679331 U CN205679331 U CN 205679331U CN 201620625709 U CN201620625709 U CN 201620625709U CN 205679331 U CN205679331 U CN 205679331U
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Abstract
A kind of double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, have: enter the sine wave generating circuit that line frequency selects；Phase-shift circuit, this circuit connects sine wave generation circuit；Sinusoidal constant current drive circuit, this circuit connects sine wave generating circuit；Temperature sensor and modulate circuit, this circuit connects sinusoidal constant current drive circuit；Differential amplifier circuit, this circuit jointing temp sensor and modulate circuit；Phase-locked amplifying circuit, this circuit connects differential amplifier circuit and phase-shift circuit；Low-pass filter circuit, this circuit connects phase-locked amplifying circuit；Data acquisition and procession circuit, this circuit connects low-pass filter circuit；Display circuit, this circuit connects data acquisition and procession circuit, this apparatus structure internal noise simple, reasonable in design, anti-and external electromagnetic interference ability is strong, test accuracy is high, can promote the use of technical field of temperature measurement.
Description
Technical field
The utility model belongs to temperature measuring equipment or equipment technical field, is specifically related to a kind of based on platinum resistance thermometer sensor,
Double alternating constant source forcing temperature measuring equipments.
Background technology
Temperature is measurement and one of the important parameter of control, select platinum resistance sensor have measurement wide ranges and
Measure feature accurately.Traditional method is to use equivalent double Constant Direct Current source to encourage respectively by platinum resistance thermometer sensor, T100 and standard electric
The bridge circuit of resistance RN=100 Europe composition, the change of the resistance of sensor causing temperature is converted to voltage signal and makes a gift to someone difference
After amplifier amplification, conditioning, control system is realized that A/D conversion, calculating and result show.The deficiency of the method: in the first is anti-
The ability of portion's noise and external electromagnetic interference is poor, its two be in order to reduce constant-current source flow through Rt and RN self-heating produce
Error, usual constant-current source selects 1～3mA, so difference voltage signal is very little, is unfavorable for improving test accuracy.
Content of the invention
Technical problem to be solved in the utility model is to overcome the deficiency of said temperature measurement apparatus, provides one to set
Meter rationally, simple in construction, anti-internal noise and that external electromagnetic interference ability is strong, test accuracy is high based on platinum resistance thermometer sensor, is double
Alternating constant source forcing temperature measuring equipment.
Solve above-mentioned technical problem and the technical scheme is that have: enter the sine wave generating circuit that line frequency selects；Move
Circuitry phase, the output of the input termination sine wave generation circuit of this circuit；Sinusoidal constant current drive circuit, the input of this circuit
Connect the output of sine wave generating circuit；Temperature sensor and modulate circuit, the input termination sinusoidal constant current drive electricity of this circuit
The output on road；Differential amplifier circuit, the input jointing temp sensor of this circuit and the output of modulate circuit；Phase-locked amplification
Circuit, the input termination differential amplifier circuit of this circuit and the output of phase-shift circuit；Low-pass filter circuit, the input of this circuit
Terminate the output of phase-locked amplifying circuit；Data acquisition and procession circuit, the input of this circuit terminates the defeated of low-pass filter circuit
Go out end；Display circuit, the output of the input termination data acquisition and procession circuit of this circuit.
Sine wave generating circuit of the present utility model is: 7 pin of integrated circuit U1 connect 6 pin of integrated circuit U2,6 pin connect collection
Become 4 pin of circuit U 2 and be grounded, 4 pin connect 5 pin of integrated circuit U2,2 pin connect phase-shift circuit, 1 pin connects 3.3V power supply, 16 pin pass through
Resistance R11 connects 3.3V power supply, 15 pin connect one end of switch S1,20 pin ground connection, and 1 pin of integrated circuit U2 connects the 2 of integrated circuit U3
Pin, 2 pin connect 3 pin of integrated circuit U3 and be grounded, 3 pin ground connection, 10 pin connect 6 pin of integrated circuit U3 and one end of electric capacity C5,9 pin
Connecing 3.3V power supply with 8 pin, 7 pin of integrated circuit U3 connect the positive pole of 5V power supply, 4 pin connect the negative pole of 5V power supply, switch S1 another
End ground connection, the other end jointing temp sensor of electric capacity C5 and modulate circuit；The model of integrated circuit U1 is MSP430G2553, collection
Become the model of circuit U 2 be DAC7811, the model of integrated circuit U3 be OP07.
Sinusoidal constant current drive circuit of the present utility model is: 3 pin of integrated circuit U4 connect the other end of electric capacity C5 and integrated
3 pin of circuit U 5,2 pin connect the emitter stage of triode BG2 and connect one end of electric capacity C1 by resistance R8 ground connection, 7 pin and connect 5V electricity
The positive pole in source, 4 pin connect one end of electric capacity C6 and the negative pole of 5V power supply, 6 pin connect the base stage of triode BG1,2 pin of integrated circuit U5
Connect triode BG4 emitter stage and by resistance R10 ground connection, 7 pin connect one end of electric capacity C13 and the positive pole of 5V power supply, 4 pin connect electricity
Holding one end of C15 and the negative pole of 5V power supply, 6 pin connecing the base stage of triode BG3, the colelctor electrode of triode BG1 connects differential amplification electricity
The colelctor electrode of road and triode BG2 jointing temp sensor and modulate circuit, emitter stage connect the base stage of triode BG2, triode
The emitter stage of BG3 connects the base stage of triode BG4, colelctor electrode connects differential amplifier circuit and the colelctor electrode of triode BG4 jointing temp
Sensor and modulate circuit, electric capacity C1, electric capacity C6, electric capacity C15, the other end ground connection of electric capacity C13；Integrated circuit U4, integrated electricity
The model of road U5 is OP07.
Temperature sensor of the present utility model and modulate circuit be: the current collection of a termination triode BG1 of thermal resistance Rn1
Pole, the positive pole of another termination 5V power supply, the colelctor electrode of a termination triode BG3 of adjustable resistance R9, another termination 5V power supply
Positive pole.
Differential amplifier circuit of the present utility model is: 1 pin of integrated circuit U6 connects the fixing end of adjustable resistance R2,2 pin connect
The positive pole of one end of electric capacity C12 and electric capacity C10 simultaneously connects one end of electric capacity C2 and the negative pole of electric capacity C4 by resistance R7 ground connection, 3 pin
And by resistance R3 ground connection, 4 pin connect one end of electric capacity C7 and the negative pole of 5V power supply, 8 pin connect the adjustable end of adjustable resistance R2,7 pin
Connect 5V positive source, 6 pin connect phase-locked amplifying circuit, 5 pin ground connection, and the other end of electric capacity C2 and the positive pole of electric capacity C4 connect triode
The colelctor electrode of BG1, the other end of electric capacity C12 and the positive pole of electric capacity C10 connect the positive pole of triode BG3, another termination of electric capacity C7
Ground；The model of integrated circuit U6 is AD620.
Phase-locked amplifying circuit of the present utility model is: 1 pin of integrated circuit U7 connects 16 pin of integrated circuit U7,2 pin connect collection
Become 6 pin of circuit U 6,8 pin to connect one end of electric capacity C8 and the negative pole of 5V power supply, 10 pin ground connection, 20 pin and 19 pin meet integrated circuit U7
15 pin, 14 pin ground connection, 12 pin connect the positive pole of low-pass filter circuit and electric capacity C11 and one end of electric capacity C9 by resistance R4,
The other end ground connection of electric capacity C8, the other end ground connection of electric capacity C9, the minus earth of electric capacity C11；The model of integrated circuit U7 is
AD630。
Owing to the utility model have employed sine wave generating circuit, sinusoidal constant current drive circuit, temperature sensor and conditioning
Circuit, differential amplifier circuit, phase-shift circuit, phase-locked amplifying circuit, low-pass filter circuit, data acquisition and procession circuit, display
Circuit, the frequency of sine wave generating circuit selects away from power frequency, avoids the interference of power frequency forceful electric power；Sinusoidal constant current drive circuit,
The change of the resistance of sensor that temperature is caused by temperature sensor and modulate circuit is converted to voltage signal and sends into high resistant low noise
Operational amplifier A D620 extracts response signal；Response signal sends into phase-locked amplifying circuit, after utilizing known signal frequency shift
As the reference signal of the phase-locked amplifying circuit that AD630 is constituted, the signal after locking has been largely overcoming internal noise
Impact with external electromagnetic interference；Batch (-type) excitation working method under by key control, can expand exciting current is 0-
20mA, decreases the conduction time of temperature sensor and measuring resistance from source, improves self-heating effect and produces test result
Raw impact.This device is reasonable in design, simple in construction, anti-internal noise and external electromagnetic interference ability is strong, test accuracy is high,
Technical field of temperature measurement can be promoted the use of.
Brief description
Fig. 1 is electrical principle block diagram of the present utility model.
Fig. 2 is electronic circuit schematic diagram of the present utility model.
Detailed description of the invention
With embodiment, the utility model is described in further details below in conjunction with the accompanying drawings, but the utility model is not limited to this
A little embodiments.
Embodiment 1
In FIG, the utility model based on double alternating constant source forcing temperature measuring equipments of platinum resistance thermometer sensor, by sine wave
There is circuit, sinusoidal constant current drive circuit, temperature sensor and modulate circuit, differential amplifier circuit, phase-locked amplifying circuit, phase shift
Circuit, low-pass filter circuit, data acquisition and procession circuit, display circuit connect and compose, the output of sine wave generating circuit
Connect the input of sinusoidal constant current drive circuit and phase-shift circuit, the output jointing temp sensor of sinusoidal constant current drive circuit and tune
The input of the output termination differential amplifier circuit of the input of reason circuit, temperature sensor and modulate circuit, differential amplification electricity
The input of the phase-locked amplifying circuit of output termination on road, the input of the phase-locked amplifying circuit of output termination of phase-shift circuit, phase-locked
The output of the output termination low-pass filter circuit of amplifying circuit, the output termination data acquisition and procession electricity of low-pass filter circuit
The input on road, the output termination display circuit of data acquisition and procession circuit.
The sine wave generating circuit of the present embodiment is by integrated circuit U1, integrated circuit U2, integrated circuit U3, resistance R11, electricity
Hold C5, switch S1 connects and composes, the model of integrated circuit U1 be MSP430G2553, the model of integrated circuit U2 be DAC7811,
The model of integrated circuit U3 is OP07.7 pin of integrated circuit U1 connect 6 pin of integrated circuit U2,6 pin connect 4 pin of integrated circuit U2
And be grounded, 4 pin connect 5 pin of integrated circuit U2,2 pin connect phase-shift circuit, 1 pin connects 3.3V power supply, 16 pin meet 3.3V by resistance R11
Power supply, 15 pin connect one end of switch S1,20 pin ground connection, and 1 pin of integrated circuit U2 connects 2 pin of integrated circuit U3,2 pin connect integrated electricity
3 pin of road U3 and be grounded, 3 pin ground connection, 10 pin connect 6 pin of integrated circuit U3 and one end of electric capacity C5,9 pin and 8 pin connect 3.3V electricity
Source, 7 pin of integrated circuit U3 connect the positive pole of 5V power supply, 4 pin connect the negative pole of 5V power supply, the other end ground connection of switch S1, electric capacity C5
Other end jointing temp sensor and modulate circuit.The frequency of sine wave generating circuit selects away from power frequency, avoids power frequency strong
The interference of electricity.
The phase-shift circuit of the present embodiment is made up of integrated circuit U1 and electric capacity C14, and the model of integrated circuit U1 is
MSP430G2553, the negative pole of electric capacity C14 connects 2 pin of integrated circuit U1, positive pole connects phase-locked amplifying circuit.
The sinusoidal constant current drive circuit of the present embodiment is by integrated circuit U4, integrated circuit U5, resistance R8, resistance R10, electric capacity
C1, electric capacity C6, electric capacity C13, electric capacity C15, triode BG1～triode BG4 connect and compose, integrated circuit U4, integrated circuit U5
Model be OP07.3 pin of integrated circuit U4 connect the other end of electric capacity C5 and 3 pin of integrated circuit U5,2 pin meet triode BG2
Emitter stage and by resistance R8 ground connection, 7 pin connect one end of electric capacity C1 and connect the positive pole of 5V power supply, 4 pin connect one end of electric capacity C6
Connect the base stage of triode BG1 with the negative pole of 5V power supply, 6 pin, 2 pin of integrated circuit U5 connect the emitter stage of triode BG4 and pass through
Resistance R10 ground connection, 7 pin connect one end of electric capacity C13 and the positive pole of 5V power supply, 4 pin connect one end of electric capacity C15 and the negative of 5V power supply
Pole, 6 pin connect the base stage of triode BG3, and the colelctor electrode of triode BG1 connects the colelctor electrode of differential amplifier circuit and triode BG2 simultaneously
Jointing temp sensor and modulate circuit, emitter stage connect the base stage of triode BG2, and the emitter stage of triode BG3 connects triode BG4's
Base stage, colelctor electrode connect the colelctor electrode of differential amplifier circuit and triode BG4 jointing temp sensor and modulate circuit, electric capacity C1,
Electric capacity C6, electric capacity C15, the other end ground connection of electric capacity C13.
The temperature sensor of the present embodiment and modulate circuit are made up of thermal resistance Rn1, adjustable resistance R9, thermal resistance Rn1's
The colelctor electrode of one termination triode BG1, the positive pole of another termination 5V power supply, the collection of a termination triode BG3 of adjustable resistance R9
Electrode, the positive pole of another termination 5V power supply.The biography that temperature is caused by sinusoidal constant current drive circuit, temperature sensor and modulate circuit
The change of sensor resistance is converted to the voltage signal high resistant low noise operational amplifier AD620 that makes a gift to someone and extracts response signal.
The differential amplifier circuit of the present embodiment is by integrated circuit U6, adjustable resistance R2, resistance R3, resistance R7, electric capacity C2, electricity
Appearance C4, electric capacity C10, electric capacity C12, electric capacity C7 connect and compose, and the model of integrated circuit U6 is AD620.1 pin of integrated circuit U6 connects
The fixing end of adjustable resistance R2,2 pin connect one end of electric capacity C12 and the positive pole of electric capacity C10 and connect electricity by resistance R7 ground connection, 3 pin
Hold one end of C2 and the negative pole of electric capacity C4 and connect one end of electric capacity C7 and the negative pole of 5V power supply, 8 pin by resistance R3 ground connection, 4 pin
Connect the adjustable end of adjustable resistance R2,7 pin connect 5V positive source, 6 pin connect phase-locked amplifying circuit, 5 pin ground connection, the other end of electric capacity C2
Connect the colelctor electrode of triode BG1 with the positive pole of electric capacity C4, the other end of electric capacity C12 and the positive pole of electric capacity C10 connect triode BG3's
Positive pole, the other end ground connection of electric capacity C7.
The phase-locked amplifying circuit of the present embodiment is connected structure by integrated circuit U7, resistance R4, electric capacity C8, electric capacity C9, electric capacity C11
Becoming, the model of integrated circuit U7 is AD630.1 pin of integrated circuit U7 connects 16 pin of integrated circuit U7,2 pin meet integrated circuit U6
6 pin, 8 pin connect one end of electric capacity C8 and the negative pole of 5V power supply, 10 pin ground connection, 20 pin and 19 pin connect integrated circuit U7 15 pin,
14 pin ground connection, 12 pin are connect the positive pole of low-pass filter circuit and electric capacity C11 and one end of electric capacity C9 by resistance R4, electric capacity C8's
The other end is grounded, the other end ground connection of electric capacity C9, the minus earth of electric capacity C11.Response signal sends into phase-locked amplifying circuit, utilizes
The reference signal of the phase-locked amplifying circuit constituting as AD630 after known signal frequency shift, the signal after locking is at very great Cheng
The impact of internal noise and external electromagnetic interference is overcome on degree.
The low-pass filter circuit of the present embodiment is by integrated circuit U8, integrated circuit U9, diode D1, diode D2, resistance
R1, resistance R5, resistance R6, electric capacity C3 connect and compose, and integrated circuit U8, the model of integrated circuit U9 are OP07.Integrated circuit U8
2 pin by resistance R5 connect electric capacity C3 negative pole and by resistance R1 connect the positive pole of electric capacity C3 and 6 pin of integrated circuit U7,2
Pin by resistance R5 connect the positive pole of electric capacity C11,3 pin ground connection, 4 pin connect the negative pole of 5V power supply, 6 pin connect integrated circuit by resistance R6
3 pin of U9,7 pin connect the positive pole of 5V power supply, and 2 pin of integrated circuit U9 connect 6 pin of integrated circuit U9 and connect data acquisition and procession
Circuit, 4 pin ground connection, 7 pin connect the negative pole of diode D2, the positive pole of diode D2 connects the negative pole of diode D1, diode D1 is just
Pole connects 5V power supply.
The data acquisition of the present embodiment and process circuit are connected and composed by integrated circuit U10, resistance R12, integrated circuit U10
Model be MSP430G2553.16 pin of integrated circuit U10 are connect 3.3V power supply, 8 pin and 9 pin connect by resistance R12 ground connection, 1 pin
Display circuit, 2 pin connect 2 pin of integrated circuit U9,20 pin ground connection.
The display circuit of the present embodiment is connected and composed by integrated circuit U11, resistance R13, resistance R14, adjustable resistance R15,
The model of integrated circuit U11 is LCD12864.1 pin of integrated circuit U11 is grounded and connects a fixing end of adjustable resistance R15,2 pin
Connect 3.3V power supply with 4 pin, 3 pin connect the adjustable end of adjustable resistance R15,5 pin connect 9 pin of integrated circuit U10,6 pin connect integrated circuit
8 pin of U10,15 pin and 20 pin ground connection, 19 pin by resistance R13 connect 3.3V power supply, 19 pin are just connecing 5V power supply by resistance R14
Pole.
Operation principle of the present utility model is as follows:
System electrification, on the one hand, the sinusoidal signal of integrated circuit U1 output 1KHz, carries out D/A through integrated circuit U2 and turns
Change carry out that the sinusoidal signal of I/U conversion is input to integrated circuit U4, integrated circuit U5 carries out prime amplification with integrated circuit U3 and
Triode BG1～triode BG4 carries out power amplification, and the sinusoidal signal after amplifying is input to thermal resistance Rn1 and resistance R9,
Extract differential signal at thermal resistance Rn1 and resistance R9 two ends and integrated circuit U6 is carried out differential amplification, poor through integrated circuit U6
Divide the signal after amplifying to be input to integrated circuit U7 and enter horizontal lock amplification, on the other hand, the reference of integrated circuit U1 output 1KHz
Signal is carried out phase shift inputting a signal into by electric capacity C14 and enters horizontal lock in integrated circuit U7 and amplify, and integrated circuit U7 locks
The signal of 1KHz is amplified, and the signal after amplification is extracted DC component by integrated circuit U8, integrated circuit U9, is then inputted into
Integrated circuit U10 carries out A/D conversion, and last signal is shown by integrated circuit U11.
Claims (6)
1. the double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, it is characterised in that have:
Enter the sine wave generating circuit that line frequency selects；
Phase-shift circuit, the output of the input termination sine wave generation circuit of this circuit；
Sinusoidal constant current drive circuit, the output of the input termination sine wave generating circuit of this circuit；
Temperature sensor and modulate circuit, the output of the sinusoidal constant current drive circuit of input termination of this circuit；
Differential amplifier circuit, the input jointing temp sensor of this circuit and the output of modulate circuit；
Phase-locked amplifying circuit, the input termination differential amplifier circuit of this circuit and the output of phase-shift circuit；
Low-pass filter circuit, the output of the phase-locked amplifying circuit of input termination of this circuit；
Data acquisition and procession circuit, the output of the input termination low-pass filter circuit of this circuit；
Display circuit, the output of the input termination data acquisition and procession circuit of this circuit.
2. the double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, according to claim 1, its feature exists
It in described sine wave generating circuit is: 7 pin of integrated circuit U1 connect 6 pin of integrated circuit U2,6 pin meet the 4 of integrated circuit U2
Pin and be grounded, 4 pin connect 5 pin of integrated circuit U2,2 pin connect phase-shift circuit, 1 pin connects 3.3V power supply, 16 pin are connect by resistance R11
3.3V power supply, 15 pin connect one end of switch S1,20 pin ground connection, and 1 pin of integrated circuit U2 connects 2 pin of integrated circuit U3,2 pin connect collection
Become 3 pin of circuit U 3 and be grounded, 3 pin ground connection, 10 pin connect 6 pin of integrated circuit U3 and one end of electric capacity C5,9 pin and 8 pin connect
3.3V power supply, 7 pin of integrated circuit U3 connect the positive pole of 5V power supply, 4 pin connect the negative pole of 5V power supply, the other end ground connection of switch S1,
The other end jointing temp sensor of electric capacity C5 and modulate circuit；The model of integrated circuit U1 is MSP430G2553, integrated circuit U2
Model be DAC7811, the model of integrated circuit U3 be OP07.
3. the double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, according to claim 1, its feature exists
In described sinusoidal constant current drive circuit be: 3 pin of integrated circuit U4 connect the other end of electric capacity C5 and 3 pin of integrated circuit U5,2
Pin connect triode BG2 emitter stage and by resistance R8 ground connection, 7 pin connect one end of electric capacity C1 and connect the positive pole of 5V power supply, 4 pin connect
The negative pole of one end of electric capacity C6 and 5V power supply, 6 pin connect the base stage of triode BG1, and 2 pin of integrated circuit U5 connect triode BG4's
Emitter stage and connect one end of electric capacity C13 by resistance R10 ground connection, 7 pin and the positive pole of 5V power supply, 4 pin connect electric capacity C15 one end and
The negative pole of 5V power supply, 6 pin connect the base stage of triode BG3, and the colelctor electrode of triode BG1 meets differential amplifier circuit and triode BG2
Colelctor electrode and jointing temp sensor and modulate circuit, emitter stage connect the base stage of triode BG2, the emitter stage of triode BG3 connects
The base stage of triode BG4, colelctor electrode connect the colelctor electrode of differential amplifier circuit and triode BG4 jointing temp sensor and conditioning electricity
Road, electric capacity C1, electric capacity C6, electric capacity C15, the other end ground connection of electric capacity C13；Integrated circuit U4, the model of integrated circuit U5 are
OP07。
4. the double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, according to claim 1, its feature exists
In described temperature sensor and modulate circuit be: thermal resistance Rn1 one termination triode BG1 colelctor electrode, another terminate 5V
The positive pole of power supply, the colelctor electrode of a termination triode BG3 of adjustable resistance R9, the positive pole of another termination 5V power supply.
5. the double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, according to claim 1, its feature exists
It in described differential amplifier circuit is: 1 pin of integrated circuit U6 connects the fixing end of adjustable resistance R2,2 pin connect one end of electric capacity C12
Connect one end of electric capacity C2 and the negative pole of electric capacity C4 with the positive pole of electric capacity C10 and by resistance R7 ground connection, 3 pin and connect by resistance R3
Ground, 4 pin connect one end of electric capacity C7 and the negative pole of 5V power supply, 8 pin connect the adjustable end of adjustable resistance R2,7 pin connect 5V positive source, 6
Pin connects phase-locked amplifying circuit, 5 pin ground connection, and the other end of electric capacity C2 and the positive pole of electric capacity C4 connect the colelctor electrode of triode BG1, electric capacity
The positive pole of the other end of C12 and electric capacity C10 connects the positive pole of triode BG3, the other end ground connection of electric capacity C7；The type of integrated circuit U6
Number be AD620.
6. the double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, according to claim 1, its feature exists
It in described phase-locked amplifying circuit is: 1 pin of integrated circuit U7 connects 16 pin of integrated circuit U7,2 pin meet the 6 of integrated circuit U6
Pin, 8 pin connect one end of electric capacity C8 and the negative pole of 5V power supply, 10 pin ground connection, 20 pin and 19 pin connect 15 pin of integrated circuit U7,14 pin
Ground connection, 12 pin are connect the positive pole of low-pass filter circuit and electric capacity C11 and one end of electric capacity C9 by resistance R4, another of electric capacity C8
End ground connection, the other end ground connection of electric capacity C9, the minus earth of electric capacity C11；The model of integrated circuit U7 is AD630.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620625709.5U CN205679331U (en) | 2016-06-22 | 2016-06-22 | Double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620625709.5U CN205679331U (en) | 2016-06-22 | 2016-06-22 | Double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, |
Publications (1)
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| CN205679331U true CN205679331U (en) | 2016-11-09 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620625709.5U Expired - Fee Related CN205679331U (en) | 2016-06-22 | 2016-06-22 | Double alternating constant source forcing temperature measuring equipments based on platinum resistance thermometer sensor, |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507695A (en) * | 2017-02-27 | 2018-09-07 | 北京自动化控制设备研究所 | A kind of atomic air chamber temperature checking method based on locking phase amplification |
| CN109753095A (en) * | 2017-11-03 | 2019-05-14 | 北京自动化控制设备研究所 | A kind of atomic air chamber based on multi-point joint observing and controlling is without magnetic temperature control system |
| WO2024040626A1 (en) * | 2022-08-24 | 2024-02-29 | 北京华卓精科科技股份有限公司 | Temperature measurement method and apparatus based on synchronous detection |
-
2016
- 2016-06-22 CN CN201620625709.5U patent/CN205679331U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507695A (en) * | 2017-02-27 | 2018-09-07 | 北京自动化控制设备研究所 | A kind of atomic air chamber temperature checking method based on locking phase amplification |
| CN109753095A (en) * | 2017-11-03 | 2019-05-14 | 北京自动化控制设备研究所 | A kind of atomic air chamber based on multi-point joint observing and controlling is without magnetic temperature control system |
| WO2024040626A1 (en) * | 2022-08-24 | 2024-02-29 | 北京华卓精科科技股份有限公司 | Temperature measurement method and apparatus based on synchronous detection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161109 Termination date: 20170622 |