CN207894534U - A kind of simple temperature observation circuit - Google Patents
A kind of simple temperature observation circuit Download PDFInfo
- Publication number
- CN207894534U CN207894534U CN201820393235.5U CN201820393235U CN207894534U CN 207894534 U CN207894534 U CN 207894534U CN 201820393235 U CN201820393235 U CN 201820393235U CN 207894534 U CN207894534 U CN 207894534U
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- Prior art keywords
- resistance
- amplifier
- temperature
- output
- observation circuit
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Abstract
A kind of simple temperature observation circuit, belongs to electric automatization field, and the utility model is to solve the problems, such as temperature monitoring in oilfield explorating developing process.The utility model includes temperature sensor Rt1, amplifier U1~U2, resistance R1~R10, capacitance C1 and zener diode D1；Rt, R4, R5, R6 Compositional balance electric bridge.Amplifier U1 provides constant pressure for balancing electric bridge, and temperature, which is changed caused resistance change, by balanced bridge is converted to voltage signal, then U2 exports corresponding variable quantity, and U2 is used for carrying out calculus of differences to the potential difference that electric bridge exports and amplifies output.The temperature change value of output voltage and platinum resistance is linear, and the variation of output voltage can react the variation of platinum resistance resistance value, that is, react the variation of temperature value.
Description
Technical field
The utility model is related to a simple temperature sensing circuits, belong to electric automatization field.
Background technology
In oilfield explorating developing process, the variation of reservoir temperature and borehole fluid temperature be very important parameter and
Information.Temperature logging data can be used for determining reservoir temperature, understand borehole fluid flow regime, the division of Occurrence Horizon, oil,
Vapour, outlet liquid level are set, and check many aspects such as leakage, the channelling of casing.Down-hole casing generated due to corrosion crack, hole or
When person's cementing quality is undesirable, casing coupling sealing is bad, it can usually cause casing leak, production formations fluid is caused to enter wellbore
In, so as to cause well temperature exception.In electromagnetic detection instrument, temperature measurement is mainly used to detect the change of fluid temperature (F.T.) in wellbore
Change, determines the position of casing middle outlet liquid.By the determination to casing leak position, and combine the information of magnetic probe monitoring can be with
The correlation circumstance for understanding down-hole casing, can provide accurate information for the inspection and reparation of casing.Therefore, high-precision temperature
Measuring circuit is extremely important.
Invention content
The utility model aim is to solve the problems, such as temperature monitoring in oilfield explorating developing process, provide one kind
Simple temperature observation circuit.
A kind of simple temperature observation circuit described in the utility model includes temperature sensor Rt1, amplifier U1, amplifier U2, electricity
Hinder R1~R10, capacitance C1 and zener diode D1；
The in-phase input end of amplifier U1 connects one end of resistance R2, one end of temperature sensor Rt1 and resistance R6 simultaneously
One end；The other end of resistance R2 connects one end of the cathode and resistance R1 of zener diode D1, the sun of zener diode D1 simultaneously
Pole is grounded, another termination+12V power supplys of resistance R1；
The inverting input of amplifier U1 is grounded by resistance R3；
The output end of amplifier U1 connects one end of one end and resistance R5 of resistance R4 simultaneously；
The reverse phase that the other end of resistance R4 connect amplifier U2 with the other end of temperature sensor Rt1 by resistance R8 simultaneously is defeated
Enter end, the inverting input of amplifier U2 is also grounded by resistance R9；The other end of resistance R5 and the other end of resistance R6 lead to simultaneously
Cross the in-phase input end of resistance R7 connection amplifiers U2；
The both ends shunt capacitance C1 of parallel resistance R10 between the in-phase input end and output end of amplifier U2, resistance R10；Fortune
Put the output end output temperature variable signal of U2.
Preferably, temperature sensor Rt1 uses Pt1000 thermal resistances.
Preferably, the operational amplifier of the model AD8672 of amplifier U1 and amplifier U2.
The beneficial effects of the utility model：Temperature is changed caused resistance value using balanced bridge and become by the utility model
Change is converted to voltage signal, and the potential difference of output by calculus of differences and amplifies output.The temperature change of output voltage and platinum resistance
It is worth linear, acquires the variable quantity of output voltage to obtain the variable quantity of temperature value.The control device is only by few
The component of amount is built, and structure is very simple, but performance is highly stable, is had the advantages that at low cost, with long service life.
Description of the drawings
Fig. 1 is a kind of circuit diagram of simple temperature observation circuit described in the utility model.
Specific implementation mode
Specific implementation mode one：It is illustrated with reference to Fig. 1, simple temperature observation circuit described in present embodiment includes
Temperature sensor Rt1, amplifier U1, amplifier U2, resistance R1~R10, capacitance C1 and zener diode D1；
The in-phase input end of amplifier U1 connects one end of resistance R2, one end of temperature sensor Rt1 and resistance R6 simultaneously
One end；The other end of resistance R2 connects one end of the cathode and resistance R1 of zener diode D1, the sun of zener diode D1 simultaneously
Pole is grounded, another termination+12V power supplys of resistance R1；
The inverting input of amplifier U1 is grounded by resistance R3；
The output end of amplifier U1 connects one end of one end and resistance R5 of resistance R4 simultaneously；
The reverse phase that the other end of resistance R4 connect amplifier U2 with the other end of temperature sensor Rt1 by resistance R8 simultaneously is defeated
Enter end, the inverting input of amplifier U2 is also grounded by resistance R9；The other end of resistance R5 and the other end of resistance R6 lead to simultaneously
Cross the in-phase input end of resistance R7 connection amplifiers U2；
The both ends shunt capacitance C1 of parallel resistance R10 between the in-phase input end and output end of amplifier U2, resistance R10；Fortune
Put the output end output temperature variable signal of U2.
Temperature sensor Rt1 uses Pt1000 thermal resistances.There are mainly three types of modes for the lead of thermal resistance at present：Two lines, three
Line or four-wire system.This system selects the connection type of Pt1000 for twin wire in actual use.
The operational amplifier of the model AD8672 of amplifier U1 and amplifier U2.
Operation principle：Rt, R4, R5, R6 Compositional balance electric bridge.The amplifier U1 of model AD8672 is carried for balancing electric bridge
For constant pressure, initial electric bridge is equilibrium state, and two input terminal received signals of U2 also balance, the voltage of the output end output of U2
For definite value, after the temperature that Rt is monitored changes, the balance of electric bridge is broken, the voltage value hair that two input terminals of U2 receive
Temperature is changed caused resistance change by balanced bridge and is converted to voltage signal by changing, then U2 the output phases are answered
Variable quantity, potential difference progress calculus of differences that U2 is used for export electric bridge simultaneously amplifies output.Output voltage Vo and platinum resistance
Temperature change value Δ R is linear, and the variation of output voltage Vo can react the variation of platinum resistance resistance value, that is, react temperature
The variation of angle value.
Although the embodiment disclosed by the utility model is as above, the content is only to facilitate understand this practicality
Novel and use embodiment, is not limited to the utility model.Skill in any the utility model technical field
Art personnel can be in the formal and details of implementation under the premise of not departing from the spirit and scope disclosed by the utility model
On make any modification and variation, but the scope of patent protection of the utility model, must still be defined with appended claims
Range subject to.
Claims (3)
1. a kind of simple temperature observation circuit, which is characterized in that including temperature sensor Rt1, amplifier U1, amplifier U2, resistance R1
~R10, capacitance C1 and zener diode D1；
The in-phase input end of amplifier U1 connects one end of one end of resistance R2, one end and resistance R6 of temperature sensor Rt1 simultaneously；
The other end of resistance R2 connects one end of the cathode and resistance R1 of zener diode D1 simultaneously, and the anode of zener diode D1 connects
Ground, another termination+12V power supplys of resistance R1；
The inverting input of amplifier U1 is grounded by resistance R3；
The output end of amplifier U1 connects one end of one end and resistance R5 of resistance R4 simultaneously；
The other end of resistance R4 connect the anti-phase input of amplifier U2 with the other end of temperature sensor Rt1 by resistance R8 simultaneously
End, the inverting input of amplifier U2 are also grounded by resistance R9；The other end of resistance R5 and the other end of resistance R6 pass through simultaneously
The in-phase input end of resistance R7 connection amplifiers U2；
The both ends shunt capacitance C1 of parallel resistance R10 between the in-phase input end and output end of amplifier U2, resistance R10；Amplifier U2
Output end output temperature variable signal.
2. a kind of simple temperature observation circuit according to claim 1, which is characterized in that temperature sensor Rt1 is used
Pt1000 thermal resistances.
3. a kind of simple temperature observation circuit according to claim 1, which is characterized in that the model of amplifier U1 and amplifier U2
The operational amplifier of AD8672.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820393235.5U CN207894534U (en) | 2018-03-22 | 2018-03-22 | A kind of simple temperature observation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820393235.5U CN207894534U (en) | 2018-03-22 | 2018-03-22 | A kind of simple temperature observation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207894534U true CN207894534U (en) | 2018-09-21 |
Family
ID=63539835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820393235.5U Expired - Fee Related CN207894534U (en) | 2018-03-22 | 2018-03-22 | A kind of simple temperature observation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207894534U (en) |
-
2018
- 2018-03-22 CN CN201820393235.5U patent/CN207894534U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20180921 Termination date: 20190322 |