CN201788034U - Measuring device for seawater temperature - Google Patents
Measuring device for seawater temperature Download PDFInfo
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- CN201788034U CN201788034U CN201020539356XU CN201020539356U CN201788034U CN 201788034 U CN201788034 U CN 201788034U CN 201020539356X U CN201020539356X U CN 201020539356XU CN 201020539356 U CN201020539356 U CN 201020539356U CN 201788034 U CN201788034 U CN 201788034U
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Abstract
The utility model discloses a measuring device for seawater temperature, specifically comprising an unbalance bridge circuit unit, a constant current source generation circuit unit, a voltage follower circuit unit and a filter amplifying circuit; the input end of the unbalance bridge circuit unit is connected with the anode of a direct current voltage through a resistor R8; the output end of the unbalance bridge circuit unit is connected with the voltage follower circuit; the output end of the constant current source generation circuit unit is connected with the unbalance bridge circuit unit; the voltage follower circuit unit is connected with the filter amplifying circuit through a resistor R9 and a resistor R10; and the input end of the constant current source generation circuit unit is connected with a +5V power supply. The utility model has the characteristic of high sensitivity, excellent stability and long service life; the measuring precision is much higher than the traditional thermoelectric pair or pressure type thermodetector; and the measuring device has obvious technical advantage within the conventional temperature measuring range of seawater (between -2 DEG C and 30 DEG C).
Description
Technical field
The utility model belongs to field of ocean engineering, is specifically related to a kind of high stability ocean temperature measurement mechanism based on the platinum resistance thermometer sensor, sensor.
Technical background
Ocean temperature is a physical quantity of the hot situation of reflection seawater, also is one of most important factor in the marine hydrology condition monitoring, and Chang Zuowei research water body character is described the basic index that water body moves.The probe of measuring ocean temperature at present mainly contains thermistor, platinum resistance thermometer sensor, and thermopair.Thermopair mainly has advantage under high temperature thermometric condition, mainly adopt the thermocouple temperature measurement principle design as near the temperature sensing the hydrothermal vent, but thermocouple thermometer precision in the conventional temperature temperature-measuring range of seawater is not high.The precision of thermistor and platinum resistance is substantially in same magnitude, wherein the thermistor cost low, be easy to make, and the linearity of platinum resistance is better, stability is stronger, but because resistance is less, needs complicated modulate circuit and the design cost that seems is higher.The interior temperature sensor of CTD section plotter extensively adopts thermistor both at home and abroad at present, and this method stability is short of to some extent, the calibration formula complexity between thermometric frequency and the temperature value.
The utility model content
The purpose of this utility model is the deficiency at existing ocean temperature metering circuit, provides a kind of at the high stability ocean temperature measurement mechanism of the conventional temperature-measuring range of seawater (2 ℃～30 ℃) based on platinum resistance thermometer sensor.
The technical scheme that the utility model is adopted for achieving the above object is:
A kind of ocean temperature measurement mechanism comprises, nonequilibrium bridge circuit unit, constant current source produce circuit unit, voltage follower circuit unit and filter amplification circuit unit; Described nonequilibrium bridge circuit unit input end links to each other with the positive pole of DC voltage by resistance R 8; Described nonequilibrium bridge circuit unit output terminal links to each other with described voltage follower circuit unit; The output terminal that described constant current source produces circuit unit links to each other with described nonequilibrium bridge circuit unit; Described voltage follower circuit unit links to each other with the filter amplification circuit unit by resistance R 9, resistance R 10; The input end that described constant current source produces circuit unit links to each other with+5V power supply.
Described nonequilibrium bridge circuit unit is made up of the right brachium pontis and the buffer circuit of nonequilibrium bridge circuit left side brachium pontis, nonequilibrium bridge; Described nonequilibrium bridge circuit left side brachium pontis one end links to each other with divider resistance R8, and the other end links to each other with buffer circuit one end; The described buffer circuit other end links to each other with the right brachium pontis of three-wire system nonequilibrium bridge, by buffer circuit the left brachium pontis and the right brachium pontis of nonequilibrium bridge circuit unit is isolated.
Described constant current source produces circuit unit by reference voltage source circuit, amplifies comparator circuit, adjusts circuit and sample circuit and forms; The output terminal of described reference voltage circuit links to each other with the inverting input that amplifies comparator circuit, the output terminal of amplifier comparator circuit links to each other with the grid of the triode Q1 that adjusts circuit, the transistor T 1 of adjusting circuit links to each other with sample circuit, and the feedback resistance R11 of sample circuit links to each other with amplification comparator circuit positive input; Described constant current source produces circuit unit and provides steady current by reference voltage source circuit for the left brachium pontis of three-wire system nonequilibrium bridge circuit, realizes the linearity power supply of bridge diagram.
Described voltage follower circuit unit mainly comprises first and second voltage follower; First voltage follower comprises operational amplifier U3, and second voltage follower comprises operational amplifier U4; The in-phase input end of operational amplifier U3 links to each other with an end of the resistance R 5 of nonequilibrium bridge circuit left side brachium pontis, and the output terminal of the inverting input and its of operational amplifier U3 oneself links to each other, and forms first voltage follower; The in-phase input end of described operational amplifier U4 is connected between the resistance R 4, resistance R 5 of nonequilibrium bridge circuit left side brachium pontis, and the output terminal of the inverting input and its of operational amplifier U4 oneself links to each other, and forms second voltage follower; Described voltage follower circuit unit improves input impedance, nonequilibrium bridge circuit unit and filter amplification circuit unit are cushioned and isolates.
Described amplification filtering circuit unit mainly comprises operational amplifier U5, resistance R 12, resistance R 13, resistance R 14, resistance R 15, filter capacitor C3, filter capacitor C4, operational amplifier U6; The positive input of described operational amplifier U5 links to each other with the output terminal of the operational amplifier U3 of first voltage follower, the inverting input of operational amplifier U5 links to each other with the output terminal of the operational amplifier U4 of second voltage follower, between the in-phase input end of operational amplifier U5 and output terminal and be connected with resistance R 15; The inverting input of described operational amplifier U5 links to each other with resistance R 12 1 ends, the other end ground connection of resistance R 12; The output terminal of operational amplifier U5 links to each other with an end of resistance R 13, and resistance R 13 other ends link to each other with an end of resistance R 14, and the other end of resistance R 14 links to each other with the in-phase input end of operational amplifier U6; Described filter capacitor C3 one end links to each other with resistance R 14, and the other end links to each other with the inverting input of operational amplifier U6; Described filter capacitor C4 one end links to each other other end ground connection with the in-phase input end of operational amplifier U6; The output terminal of operational amplifier U6 links to each other with inverting input; Described amplification filtering circuit unit mainly amplifies signal, filtering, and convenient back level sample circuit is to signals sampling.
Described nonequilibrium bridge circuit unit comprises adjustable resistance R1, the first lead resistance R4, the second lead resistance R5, the 3rd lead resistance R6, thermometric platinum resistance R100, isolated amplifier U1, the first precision resistance R2, the second precision resistance R3; Linking to each other of the positive pole of described divider resistance R8 one end and direct supply, the other end of divider resistance R8 links to each other with the end of adjustable resistance R1, the other end of described adjustable resistance R1 links to each other with the first lead resistance R4, the other end of the described first lead resistance R4 respectively with the second lead resistance R5, the end of thermometric platinum resistance R100 links to each other, the other end of described thermometric platinum resistance R100 links to each other with the collector and the 3rd lead resistance R6 one end of the transistor T 1 of adjusting circuit 2-3 respectively, described first, two precision resistance R2, R3 forms the right brachium pontis of electric bridge, wherein the end of the second precision resistance R2 links to each other with divider resistance R8, and the other end links to each other with the second precision resistance R3; The same input end in opposite directions of described isolated amplifier U1 links to each other with the 3rd lead resistance R6, and the inverting input of isolated amplifier U1 links to each other with the second precision resistance R3 of right brachium pontis, and the output terminal of isolated amplifier U1 links to each other with its inverting input.
The output voltage of described reference voltage circuit is 2.5V, and it is by the amplifier comparator circuit and adjust the voltage that circuit is gathered sampling resistor R11 in the sample circuit, compares with reference voltage then, obtains a voltage difference; Described reference voltage circuit amplifies the back by comparison amplifier U2 and links to each other with transistor T 1, by voltage difference regulation and control transistor T 1, changes the voltage drop between transistor T 1 c-e, thereby reaches the purpose of constant current; Work as I
CeWhen becoming big, it is big that the pressure drop on the resistance R 11 becomes, and reference voltage is constant, and therefore, the output of comparison amplifier diminishes, and the base current of transistor T 1 diminishes, thus I
CeDescend; Work as I
CeWhen diminishing, adjustment process is opposite.
Advantage of the present utility model:
1, the utility model utilizes constant current source to produce circuit unit and drives the nonequilibrium bridge circuit unit, adopting the platinum resistance thermometer sensor, sensor is inductor, and utilize the three-wire system mode of connection to connect platinum resistance thermometer sensor,, can compensate the non-linear of nonequilibrium bridge circuit unit to a great extent, overcome by the lead resistance secular variation bring the time become error, thereby the ocean temperature that realizes high stability is measured.
2, the utlity model has characteristics such as highly sensitive, good stability, long service life, measuring accuracy in the conventional temperature-measuring range of seawater (2 ℃～30 ℃), has tangible technical advantage far above traditional thermoelectricity pressure type temperature measurer occasionally.
Description of drawings
With specific embodiment the utility model is further elaborated with reference to the accompanying drawings below.
Fig. 1 is a circuit structure block diagram of the present utility model;
Fig. 2 is three-wire system nonequilibrium bridge circuit unit figure among Fig. 1;
Fig. 3 is that constant current source produces circuit unit figure among Fig. 1;
Fig. 4 is two-way voltage follower circuit unit figure among Fig. 1;
Fig. 5 is amplification filtering circuit unit figure among Fig. 1.
Embodiment
Shown in Fig. 1,2,3,4,5, a kind of ocean temperature measurement mechanism comprises, nonequilibrium bridge circuit unit 1, constant current source produce circuit unit 2, voltage follower circuit unit 3 and filter amplification circuit unit 4; Described nonequilibrium bridge circuit unit 1 input end links to each other with the positive pole of DC voltage by divider resistance R8; Described nonequilibrium bridge circuit unit 1 output terminal links to each other with described voltage follower circuit unit 3; Described nonequilibrium bridge circuit unit 1 output terminal produces circuit unit 2 with described constant current source and links to each other; Described voltage follower circuit unit 3 links to each other with filter amplification circuit unit 4 by resistance R 9, resistance R 10; Described constant current source produces circuit unit 2 one ends and links to each other with+5V power supply.
Described nonequilibrium bridge circuit unit 1 is made up of the right brachium pontis 1-2 and the buffer circuit 1-3 of nonequilibrium bridge circuit left side brachium pontis 1-1, nonequilibrium bridge; Described nonequilibrium bridge circuit left side brachium pontis 1-1 one end links to each other with divider resistance R8, and the other end links to each other with buffer circuit 1-3 one end; The described buffer circuit 1-3 other end links to each other with the right brachium pontis 1-2 of three-wire system nonequilibrium bridge, by buffer circuit 1-3 the left brachium pontis 1-1 and the right brachium pontis 1-2 of nonequilibrium bridge circuit unit 1 is isolated, and the electric current of left and right sides bridge is independent of each other.
The circuit of described nonequilibrium bridge circuit unit 1 comprises: adjustable resistance R1, the first lead resistance R4, the second lead resistance R5, the 3rd lead resistance R6, thermometric platinum resistance R100, isolated amplifier U1, the first precision resistance R2, the second precision resistance R3; Linking to each other of the positive pole of described divider resistance R8 one end and direct supply, the other end of divider resistance R8 links to each other with the end of adjustable resistance R1, the other end of described adjustable resistance R1 links to each other with the first lead resistance R4, the other end of the described first lead resistance R4 respectively with the second lead resistance R5, the end of thermometric platinum resistance R100 links to each other, the other end of described thermometric platinum resistance R100 links to each other with the collector and the 3rd lead resistance R6 one end of the transistor T 1 of adjusting circuit 2-3 respectively, described first, two precision resistance R2, R3 forms the right brachium pontis 1-2 of electric bridge, wherein the end of the second precision resistance R2 links to each other with divider resistance R8, and the other end links to each other with the second precision resistance R3; The same input end in opposite directions of described isolated amplifier U1 links to each other with the 3rd lead resistance R6, and the inverting input of isolated amplifier U1 links to each other with the second precision resistance R3 of right brachium pontis 1-2, and the output terminal of isolated amplifier U1 links to each other with its inverting input.
Described constant current source produces circuit unit 2 by reference voltage source circuit 2-1, amplifies comparator circuit 2-2, adjusts circuit 2-3 and sample circuit 2-4 and forms; The output terminal of described reference voltage circuit 2-1 links to each other with the inverting input that amplifies comparator circuit 2-2, the output terminal of amplifier comparator circuit 2-2 links to each other with the grid of the triode Q1 that adjusts circuit 2-3, the transistor T 1 of adjusting circuit 2-3 links to each other with sample circuit 2-4, and the sampling resistor R11 of sample circuit 2-4 links to each other with amplification comparator circuit 2-2 positive input; Described constant current source produces circuit unit 2 and provides steady current by reference voltage source circuit 2-1 for the left brachium pontis of nonequilibrium bridge circuit 1, realizes the linearity power supply of bridge diagram, eliminates the non-linear of traditional constant pressure source electric bridge.
Constant current source produces circuit unit 2 circuit and comprises: divider resistance R7, and reference voltage produces chip TL431, the first filter capacitor C1, integrated operational amplifier U1, first adjusts pipe Q1, and second adjusts pipe T1, sampling resistor R11, the second filter capacitor C2.The positive pole of the termination DC input voitage of described divider resistance R7, another termination reference voltage chip T431, the output termination filter capacitor C1 of reference voltage chip T431, the first filter capacitor C1 connects the inverting input of integrated operational amplifier U1, the grid of the output termination triode Q1 of integrated operational amplifier U1, the source electrode of triode Q1 links to each other with the collector of transistor T 1, the drain electrode of triode Q1 is connected with the base stage of transistor T 1, the emitter of transistor T 1 connects the end of sampling resistor R11, and feed back to the in-phase input end of integrated operational amplifier U1, the second filter capacitor C2 and sampling resistor R11 ground connection in parallel.
Described voltage follower circuit unit 3 mainly comprises first and second voltage follower 3-1,3-2; First voltage follower comprises operational amplifier U3, and the second voltage follower 3-2 comprises operational amplifier U4; The in-phase input end of operational amplifier U3 links to each other with an end of the resistance R 5 of nonequilibrium bridge circuit left side brachium pontis 1-1, and the output terminal of the inverting input and its of operational amplifier U3 oneself links to each other, and forms the first voltage follower 3-1; The in-phase input end of operational amplifier U4 is connected between the resistance R 4, resistance R 5 of nonequilibrium bridge circuit left side brachium pontis 1-1, and the output terminal of the inverting input and its of operational amplifier U4 oneself links to each other, and forms the second voltage follower 3-2; Described voltage follower circuit unit 3 improves input impedance, nonequilibrium bridge circuit unit 1 and filter amplification circuit unit 4 are cushioned and isolates.Voltage follower circuit 3 has improved input impedance, plays buffering and isolates the effect of preceding late-class circuit.
Described amplification filtering circuit unit 4 mainly comprises operational amplifier U5, resistance R 12, resistance R 13, resistance R 14, resistance R 15, filter capacitor C3, filter capacitor C4, operational amplifier U6; The positive input of described operational amplifier U5 links to each other with the output terminal of the operational amplifier U3 of the first voltage follower 3-1, the inverting input of operational amplifier U5 links to each other with the output terminal of the operational amplifier U4 of the second voltage follower 3-2, between the in-phase input end of operational amplifier U5 and output terminal and be connected with resistance R 15; The inverting input of described operational amplifier U5 links to each other with resistance R 12 1 ends, the other end ground connection of resistance R 12; The output terminal of operational amplifier U5 links to each other with an end of resistance R 13, and resistance R 13 other ends link to each other with an end of resistance R 14, and the other end of resistance R 14 links to each other with the in-phase input end of operational amplifier U6; Described filter capacitor C3 one end links to each other with resistance R 14, and the other end links to each other with the inverting input of operational amplifier U6; Described filter capacitor C4 one end links to each other other end ground connection with the in-phase input end of operational amplifier U6; The output terminal of operational amplifier U6 links to each other with inverting input; Described amplification filtering circuit unit 4 mainly amplifies signal, filtering, and convenient back level sample circuit is to signals sampling.
The output terminal of reference voltage circuit 2-1 links to each other with the inverting input that amplifies comparator circuit 2-2, the output terminal of amplifier comparator circuit 2-2 links to each other with the grid of the Q1 that adjusts circuit 2-3, the transistor T 1 of adjusting circuit 2-3 links to each other with sample circuit 2-4, the feedback resistance of sample circuit 2-4 and amplification comparator circuit 2-2.The output voltage of reference voltage circuit 2-1 is 2.5V, by feedback network to the voltage sampling on the sample resistance R11, compare with reference voltage then, obtain a difference, go control to adjust pipe T1 after this difference amplified with comparison amplifier U2, change the voltage drop of adjusting between the pipe c-e, thereby reach the purpose of constant current.Work as I
CeWhen becoming big, it is big that the pressure drop on the R11 becomes, and reference voltage is constant, and therefore, the output of comparison amplifier diminishes, and the base current of adjusting pipe T1 diminishes, thus I
CeDescend.I
CeWhen diminishing, adjustment process is opposite.
Claims (7)
1. an ocean temperature measurement mechanism is characterized in that: comprise that nonequilibrium bridge circuit unit, constant current source produce circuit unit, voltage follower circuit unit and filter amplification circuit unit;
Described nonequilibrium bridge circuit unit input end links to each other with the positive pole of DC voltage by resistance R 8;
Described nonequilibrium bridge circuit unit output terminal links to each other with described voltage follower circuit unit;
The output terminal that described constant current source produces circuit unit links to each other with described nonequilibrium bridge circuit unit;
Described voltage follower circuit unit links to each other with the filter amplification circuit unit by resistance R 9, resistance R 10;
The input end that described constant current source produces circuit unit links to each other with+5V power supply.
2. by the described ocean temperature measurement mechanism of claim 1, it is characterized in that:
Described nonequilibrium bridge circuit unit is made up of the right brachium pontis and the buffer circuit of nonequilibrium bridge circuit left side brachium pontis, nonequilibrium bridge;
Described nonequilibrium bridge circuit left side brachium pontis one end links to each other with divider resistance R8, and the other end links to each other with buffer circuit one end;
The described buffer circuit other end links to each other with the right brachium pontis of three-wire system nonequilibrium bridge, by buffer circuit the left brachium pontis and the right brachium pontis of nonequilibrium bridge circuit unit is isolated.
3. by the described ocean temperature measurement mechanism of claim 1, it is characterized in that:
Described constant current source produces circuit unit by reference voltage source circuit, amplifies comparator circuit, adjusts circuit and sample circuit and forms;
The output terminal of described reference voltage circuit links to each other with the inverting input that amplifies comparator circuit, the output terminal of amplifier comparator circuit links to each other with the grid of the triode Q1 that adjusts circuit, the transistor T 1 of adjusting circuit links to each other with sample circuit, and the feedback resistance R11 of sample circuit links to each other with amplification comparator circuit positive input;
Described constant current source produces circuit unit and provides steady current by reference voltage source circuit for the left brachium pontis of three-wire system nonequilibrium bridge circuit, realizes the linearity power supply of bridge diagram.
4. by the described ocean temperature measurement mechanism of claim 1, it is characterized in that:
Described voltage follower circuit unit mainly comprises first and second voltage follower; First voltage follower comprises operational amplifier U3, and second voltage follower comprises operational amplifier U4; The in-phase input end of operational amplifier U3 links to each other with an end of the resistance R 5 of nonequilibrium bridge circuit left side brachium pontis, and the output terminal of the inverting input and its of operational amplifier U3 oneself links to each other, and forms first voltage follower;
The in-phase input end of described operational amplifier U4 is connected between the resistance R 4, resistance R 5 of nonequilibrium bridge circuit left side brachium pontis, and the output terminal of the inverting input and its of operational amplifier U4 oneself links to each other, and forms second voltage follower;
Described voltage follower circuit unit improves input impedance, nonequilibrium bridge circuit unit and filter amplification circuit unit are cushioned and isolates.
5. by the described ocean temperature measurement mechanism of claim 1, it is characterized in that:
Described amplification filtering circuit unit mainly comprises operational amplifier U5, resistance R 12, resistance R 13, resistance R 14, resistance R 15, filter capacitor C3, filter capacitor C4, operational amplifier U6;
The positive input of described operational amplifier U5 links to each other with the output terminal of the operational amplifier U3 of first voltage follower, the inverting input of operational amplifier U5 links to each other with the output terminal of the operational amplifier U4 of second voltage follower, between the in-phase input end of operational amplifier U5 and output terminal and be connected with resistance R 15;
The inverting input of described operational amplifier U5 links to each other with resistance R 12 1 ends, the other end ground connection of resistance R 12; The output terminal of operational amplifier U5 links to each other with an end of resistance R 13, and resistance R 13 other ends link to each other with an end of resistance R 14, and the other end of resistance R 14 links to each other with the in-phase input end of operational amplifier U6; Described filter capacitor C3 one end links to each other with resistance R 14, and the other end links to each other with the inverting input of operational amplifier U6; Described filter capacitor C4 one end links to each other other end ground connection with the in-phase input end of operational amplifier U6; The output terminal of operational amplifier U6 links to each other with inverting input;
Described amplification filtering circuit unit mainly amplifies signal, filtering, and convenient back level sample circuit is to signals sampling.
6. by the described ocean temperature measurement mechanism of claim 1, it is characterized in that:
Described nonequilibrium bridge circuit unit comprises adjustable resistance R1, the first lead resistance R4, the second lead resistance R5, the 3rd lead resistance R6, thermometric platinum resistance R100, isolated amplifier U1, the first precision resistance R2, the second precision resistance R3;
Linking to each other of the positive pole of described divider resistance R8 one end and direct supply, the other end of divider resistance R8 links to each other with the end of adjustable resistance R1, the other end of described adjustable resistance R1 links to each other with the first lead resistance R4, the other end of the described first lead resistance R4 respectively with the second lead resistance R5, the end of thermometric platinum resistance R100 links to each other, the other end of described thermometric platinum resistance R100 links to each other with the collector and the 3rd lead resistance R6 one end of the transistor T 1 of adjusting circuit 2-3 respectively, described first, two precision resistance R2, R3 forms the right brachium pontis of electric bridge, wherein the end of the second precision resistance R2 links to each other with divider resistance R8, and the other end links to each other with the second precision resistance R3; The same input end in opposite directions of described isolated amplifier U1 links to each other with the 3rd lead resistance R6, and the inverting input of isolated amplifier U1 links to each other with the second precision resistance R3 of right brachium pontis, and the output terminal of isolated amplifier U1 links to each other with its inverting input.
7. by the described ocean temperature measurement mechanism of claim 1, it is characterized in that:
The output voltage of described reference voltage circuit is 2.5V, and it is by the amplifier comparator circuit and adjust the voltage that circuit is gathered sampling resistor R11 in the sample circuit, compares with reference voltage then, obtains a voltage difference;
Described reference voltage circuit amplifies the back by comparison amplifier U2 and links to each other with transistor T 1, by voltage difference regulation and control transistor T 1, changes the voltage drop between transistor T 1 c-e, thereby reaches the purpose of constant current; Work as I
CeWhen becoming big, it is big that the pressure drop on the resistance R 11 becomes, and reference voltage is constant, and therefore, the output of comparison amplifier diminishes, and the base current of transistor T 1 diminishes, thus I
CeDescend; Work as I
CeWhen diminishing, adjustment process is opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020539356XU CN201788034U (en) | 2010-09-17 | 2010-09-17 | Measuring device for seawater temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020539356XU CN201788034U (en) | 2010-09-17 | 2010-09-17 | Measuring device for seawater temperature |
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| Publication Number | Publication Date |
|---|---|
| CN201788034U true CN201788034U (en) | 2011-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020539356XU Expired - Fee Related CN201788034U (en) | 2010-09-17 | 2010-09-17 | Measuring device for seawater temperature |
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| CN (1) | CN201788034U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401698A (en) * | 2010-09-17 | 2012-04-04 | 中国科学院海洋研究所 | Measurement system for sea water temperature |
| CN104596664A (en) * | 2015-02-02 | 2015-05-06 | 珠海格力电器股份有限公司 | Temperature detection circuit and air conditioner |
| CN113849028A (en) * | 2021-10-25 | 2021-12-28 | 杭州和利时自动化有限公司 | Current output type AO circuit |
-
2010
- 2010-09-17 CN CN201020539356XU patent/CN201788034U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401698A (en) * | 2010-09-17 | 2012-04-04 | 中国科学院海洋研究所 | Measurement system for sea water temperature |
| CN102401698B (en) * | 2010-09-17 | 2013-05-22 | 中国科学院海洋研究所 | Measurement system for sea water temperature |
| CN104596664A (en) * | 2015-02-02 | 2015-05-06 | 珠海格力电器股份有限公司 | Temperature detection circuit and air conditioner |
| CN113849028A (en) * | 2021-10-25 | 2021-12-28 | 杭州和利时自动化有限公司 | Current output type AO circuit |
| CN113849028B (en) * | 2021-10-25 | 2023-03-17 | 杭州和利时自动化有限公司 | Current output type AO circuit |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110406 Termination date: 20140917 |
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| EXPY | Termination of patent right or utility model |