CN204831604U - RC charge -discharge temperature measurement system - Google Patents
RC charge -discharge temperature measurement system Download PDFInfo
- Publication number
- CN204831604U CN204831604U CN201520396028.1U CN201520396028U CN204831604U CN 204831604 U CN204831604 U CN 204831604U CN 201520396028 U CN201520396028 U CN 201520396028U CN 204831604 U CN204831604 U CN 204831604U
- Authority
- CN
- China
- Prior art keywords
- temperature
- thermal resistance
- resistance
- temperature measurement
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model relates to a temperature measurement system especially relates to a RC charge -discharge temperature measurement system. The technical problem who solves provides a RC charge -discharge temperature measurement system, does not need ADC conversion module, simple structure, the high thermal resistance temperature measurement system of the degree of accuracy. A RC charge -discharge temperature measurement system is including thermal resistance, RC oscillation circuit, frequency detection circuitry, control system, power, display, output module, the thermal resistance be connected to among the RC oscillation circuit and partly as RC oscillation circuit, RC oscillation circuit be connected to frequency detection circuitry, frequency detection circuitry, power, display, output module be connected to control system. The utility model provides a pair of RC charge -discharge temperature measurement system does not need ADC conversion module, simple structure, and the degree of accuracy is high, has compensatied the blank that does not relate to of current temperature measurement mode.
Description
Technical field
The utility model relates to a kind of temp measuring system, particularly relates to a kind of RC discharge and recharge temp measuring system.
Background technology
Temperature detection comprises contact temperature-measuring method and contactless temperature-measuring method, the feature of contacting temperature measurement method is that temperature element directly contacts with measurand, carry out sufficient heat interchange between the two, finally reach thermal equilibrium, at this moment the value of a certain physical parameter of temperature-sensing element just represents the temperature value of measurand.This method advantage is intuitive and reliable, and shortcoming is the distribution that temperature-sensing element affects dut temperature field, and loose contact etc. all can bring measuring error, and temperature is too high in addition and Korrosionsmedium can have a negative impact to the performance of temperature-sensing element and life-span.The feature of contactless temperature-measuring method is that temperature-sensing element does not contact with measurand, but carries out heat interchange by radiation, therefore can avoid the shortcoming of contacting temperature measurement method, has the higher thermometric upper limit.In addition, contactless temperature-measuring method thermal inertia is little, can reach 1/1000s, therefore is convenient to measure the temperature of moving object and fast-changing temperature.Due to by other the impact of medium of the distance between the emissivity of object, measurand to instrument and flue dust, steam etc., the general temperature measurement error of this method is larger.
Contact type temperature measuring can be divided into manometer type, thermopair, thermal resistance and expansion type.
Thermal resistance is the most frequently used a kind of temperature detector in middle low-temperature space.Thermistor Temperature Measurement increases this characteristic based on the resistance value of metallic conductor with the increase of temperature to carry out thermometric.Its principal feature is that measuring accuracy is high, stable performance.Wherein the measuring accuracy of platinum resistance thermometer sensor, is the highest, and it is not only widely used in industrial thermometric, and is made into the station meter of standard.Thermal resistance is mostly made up of simple metal material, and what application was maximum at present is platinum and copper, in addition, has started now to adopt the materials such as nickel, manganese and rhodium to manufacture thermal resistance.The temperature sensing material kind that metal fever resistance is conventional is more, and the most frequently used is platinum filament.Commercial measurement except platinum filament, also has copper, nickel, iron, iron-nickel etc. with metal fever resistance material.
The temperature-measurement principle of thermal resistance varies with temperature based on the resistance value of conductor or semiconductor heat resistance and change this characteristic to come measuring tempeature and the parameter relevant with temperature.Thermal resistance is mostly made up of simple metal material, and what application was maximum at present is platinum and copper, has started now to adopt the materials such as nickel, manganese and rhodium to manufacture thermal resistance.Thermal resistance needs resistance signal to be delivered on Computer Control Unit or other secondary instrument by lead-in wire usually.
In Thermistor Temperature Measurement systems all at present, thermal resistance temperature transmitter is made up of reference cell, R/V converting unit, linear circuit, reverse connecting protection, current-limiting protection, V/I converting unit etc.After the conversion of thermometric thermal resistance signal is amplified, then compensated by the nonlinear relationship of linear circuit to temperature and resistance, the DC current signal of 4-20mA that output one is linear with dut temperature after V/I change-over circuit or the d. c. voltage signal of 1-5V.The structure of thermal resistance temperature transmitter can be divided into three parts substantially: input bridge (as shown in Figure 2), amplifying circuit and feedback circuit.Its input bridge is in fact a unbalanced bridge.Thermal resistance is access in one of them brachium pontis, after cause thermoelectricity resistance to change by temperature variation, electric bridge just exports a unbalance voltage signal, this voltage signal by amplifying circuit and feedback circuit, just can obtain one with the output current I of input signal linearly funtcional relationship.
In this temp measuring system, also need to add the temperature information that the temperature information of analog quantity is converted to digital quantity by ADC modular converter, and need to demarcate.
Discovery is studied through us, the oscillation frequency of RC charge-discharge circuit is relevant with the resistance of resistance R, therefore consider and RC charge-discharge circuit is used for temperature detection, thermal resistance is linked into RC charge-discharge circuit, as the resistance R of RC charge-discharge circuit, utilize the temperature-resistance characteristic of thermal resistance, after cause thermoelectricity resistance to change by temperature variation, the oscillation frequency of RC charge-discharge circuit also changes, the current resistance value of thermal resistance is gone out according to detected frequency and oscillation frequency formulae discovery, the current temperature of thermal resistance is gone out again according to the temperature-resistance property calculation of used resistance.Exporting is directly digital quantity signal, in the machine displays temperature value, also temperature signal can be passed to other temperature acquisition system by output module.
RC oscillatory circuit is the oscillatory circuit adopting RC frequency selection network to form, and it is applicable to low-frequency oscillation, is generally used for the low frequency signal producing 1Hz-1MHz.For RC oscillatory circuit, the resistance changing resistance R can change oscillation frequency.And the detection of frequency is easily fairly simple, and RC oscillatory circuit has circuit simply, and the advantages such as economic convenience, its oscillation frequency is: f=1/2 π RC.
Utility model content
(1) technical matters that will solve
The utility model is in order to overcome existing resistance temperature measurement circuit, all utilize bridge circuit to carry out change to send, export as simulating signal, in this temp measuring system, also need to add the temperature information that the temperature information of analog quantity is converted to digital quantity by ADC modular converter, and need the shortcoming of demarcation, the technical problems to be solved in the utility model is to provide a kind of RC discharge and recharge temp measuring system, do not need ADC modular converter, structure is simple, the Thermistor Temperature Measurement system that accuracy is high.
(2) technical scheme
In order to solve the problems of the technologies described above, the utility model provides so a kind of RC discharge and recharge temp measuring system, includes thermal resistance, RC oscillatory circuit, frequency detection circuit, control system, power supply, display, output module; Described thermal resistance is connected in RC oscillatory circuit and as the part of RC oscillatory circuit, described RC oscillatory circuit is connected to frequency detection circuit, and described frequency detection circuit, power supply, display, output module are connected to control system.
Preferably, described thermal resistance is platinum resistance.
Preferably, described thermal resistance is copper resistance.
Preferably, described thermal resistance is semiconductor thermistor.
Preferably, described control system is single-chip computer control system.
Preferably, described display is seven segmentation nixie displaies.
Principle of work: thermal resistance has a reference resistor value at the temperature of standard temperature 20 degree, and the RC oscillatory circuit connected also has a reference oscillating frequency f0, corresponding output temperature is 20 degree, during with this temp measuring system thermometric, thermal resistance is with being in test environment or testee, identical with the temperature of test environment or testee, due to the temperature-resistance characteristic of thermal resistance, when test environment or testee and standard temperature unequal time, the resistance value of thermal resistance will depart from reference resistor value, the oscillation frequency of the RC oscillatory circuit that thermal resistance connects also can depart from reference oscillating frequency f0, the current oscillation frequency f of RC oscillatory circuit is detected by frequency detection circuit, control system calculates the current resistance value of thermal resistance according to detected frequency and oscillation frequency formula f=1/2 π RC, the current temperature of thermal resistance is calculated again according to the temperature-resistance characteristic of used thermal resistance or the phasing meter of thermal resistance, export to display display, it is directly digital quantity signal that temperature exports, can in the machine displays temperature value, also temperature signal can be passed to other temperature acquisition system by output module.
(3) beneficial effect
A kind of RC discharge and recharge temp measuring system that the utility model provides, does not need ADC modular converter, and structure is simple, and accuracy is high, compensate for the blank do not related to of existing thermometric mode.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is common thermal resistance temperature transmitter bridge circuit.
Being labeled as in accompanying drawing: 1-thermal resistance, 2-RC oscillatory circuit, 3-frequency detection circuit, 4-control system, 5-power supply, 6-display, 7-output module.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
embodiment 1
A kind of RC discharge and recharge temp measuring system, as shown in Figure 1, includes thermal resistance 1, RC oscillatory circuit 2, frequency detection circuit 3, control system 4, power supply 5, display, output module 7; Described thermal resistance 1 is connected in RC oscillatory circuit 2 and as the part of RC oscillatory circuit 2, described RC oscillatory circuit 2 is connected to frequency detection circuit 3, and described frequency detection circuit 3, power supply 5, display, output module 7 are connected to control system 4.
Described thermal resistance 1 is platinum resistance.
Described control system 4 is single-chip computer control system.
Described display is seven segmentation nixie displaies.
Thermal resistance 1 has a reference resistor value at the temperature of standard temperature 20 degree, and the RC oscillatory circuit 2 connected also has a reference oscillating frequency f0, and corresponding output temperature is 20 degree, during with this temp measuring system thermometric, thermal resistance 1 is with being in test environment or testee, identical with the temperature of test environment or testee, due to the temperature-resistance characteristic of thermal resistance 1, when test environment or testee and standard temperature unequal time, the resistance value of thermal resistance 1 will depart from reference resistor value, the oscillation frequency of the RC oscillatory circuit 2 that thermal resistance 1 connects also can depart from reference oscillating frequency f0, the current oscillation frequency f of RC oscillatory circuit 2 is detected by frequency detection circuit 3, control system 4 calculates the current resistance value of thermal resistance 1 according to detected frequency and oscillation frequency formula f=1/2 π RC, the current temperature of thermal resistance 1 is calculated again according to the temperature-resistance characteristic of used thermal resistance 1 or the phasing meter of thermal resistance 1, export to display display, it is directly digital quantity signal that temperature exports, can in the machine displays temperature value, also temperature signal can be passed to other temperature acquisition system by output module 7.
embodiment 2
A kind of RC discharge and recharge temp measuring system, as shown in Figure 1, includes thermal resistance 1, RC oscillatory circuit 2, frequency detection circuit 3, control system 4, power supply 5, display, output module 7; Described thermal resistance 1 is connected in RC oscillatory circuit 2 and as the part of RC oscillatory circuit 2, described RC oscillatory circuit 2 is connected to frequency detection circuit 3, and described frequency detection circuit 3, power supply 5, display, output module 7 are connected to control system 4.
Described thermal resistance 1 is copper resistance.
Described control system 4 is single-chip computer control system.
Described display is seven segmentation nixie displaies.
Thermal resistance 1 has a reference resistor value at the temperature of standard temperature 20 degree, and the RC oscillatory circuit 2 connected also has a reference oscillating frequency f0, and corresponding output temperature is 20 degree, during with this temp measuring system thermometric, thermal resistance 1 is with being in test environment or testee, identical with the temperature of test environment or testee, due to the temperature-resistance characteristic of thermal resistance 1, when test environment or testee and standard temperature unequal time, the resistance value of thermal resistance 1 will depart from reference resistor value, the oscillation frequency of the RC oscillatory circuit 2 that thermal resistance 1 connects also can depart from reference oscillating frequency f0, the current oscillation frequency f of RC oscillatory circuit 2 is detected by frequency detection circuit 3, control system 4 calculates the current resistance value of thermal resistance 1 according to detected frequency and oscillation frequency formula f=1/2 π RC, the current temperature of thermal resistance 1 is calculated again according to the temperature-resistance characteristic of used thermal resistance 1 or the phasing meter of thermal resistance 1, export to display display, it is directly digital quantity signal that temperature exports, can in the machine displays temperature value, also temperature signal can be passed to other temperature acquisition system by output module 7.
embodiment 3
A kind of RC discharge and recharge temp measuring system, as shown in Figure 1, includes thermal resistance 1, RC oscillatory circuit 2, frequency detection circuit 3, control system 4, power supply 5, display, output module 7; Described thermal resistance 1 is connected in RC oscillatory circuit 2 and as the part of RC oscillatory circuit 2, described RC oscillatory circuit 2 is connected to frequency detection circuit 3, and described frequency detection circuit 3, power supply 5, display, output module 7 are connected to control system 4.
Described thermal resistance 1 is semiconductor thermistor.
Described control system 4 is single-chip computer control system.
Described display is seven segmentation nixie displaies.
Thermal resistance 1 has a reference resistor value at the temperature of standard temperature 20 degree, and the RC oscillatory circuit 2 connected also has a reference oscillating frequency f0, and corresponding output temperature is 20 degree, during with this temp measuring system thermometric, thermal resistance 1 is with being in test environment or testee, identical with the temperature of test environment or testee, due to the temperature-resistance characteristic of thermal resistance 1, when test environment or testee and standard temperature unequal time, the resistance value of thermal resistance 1 will depart from reference resistor value, the oscillation frequency of the RC oscillatory circuit 2 that thermal resistance 1 connects also can depart from reference oscillating frequency f0, the current oscillation frequency f of RC oscillatory circuit 2 is detected by frequency detection circuit 3, control system 4 calculates the current resistance value of thermal resistance 1 according to detected frequency and oscillation frequency formula f=1/2 π RC, the current temperature of thermal resistance 1 is calculated again according to the temperature-resistance characteristic of used thermal resistance 1 or the phasing meter of thermal resistance 1, export to display display, it is directly digital quantity signal that temperature exports, can in the machine displays temperature value, also temperature signal can be passed to other temperature acquisition system by output module 7.
The above embodiment only have expressed preferred implementation of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion, improvement and substitute, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (6)
1. a RC discharge and recharge temp measuring system, is characterized in that, includes thermal resistance (1), RC oscillatory circuit (2), frequency detection circuit (3), control system (4), power supply (5), display, output module (7); Described thermal resistance (1) to be connected in RC oscillatory circuit (2) and as the parts of RC oscillatory circuit (2), described RC oscillatory circuit (2) is connected to frequency detection circuit (3), and described frequency detection circuit (3), power supply (5), display, output module (7) are connected to control system (4).
2. a kind of RC discharge and recharge temp measuring system according to claim 1, is characterized in that, described thermal resistance (1) is platinum resistance.
3. a kind of RC discharge and recharge temp measuring system according to claim 1, is characterized in that, described thermal resistance (1) is copper resistance.
4. a kind of RC discharge and recharge temp measuring system according to claim 1, is characterized in that, described thermal resistance (1) is semiconductor thermistor.
5. a kind of RC discharge and recharge temp measuring system according to claim 1, is characterized in that, described control system (4) is single-chip computer control system.
6. a kind of RC discharge and recharge temp measuring system according to claim 1, is characterized in that, described display is seven segmentation nixie displaies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520396028.1U CN204831604U (en) | 2015-06-10 | 2015-06-10 | RC charge -discharge temperature measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520396028.1U CN204831604U (en) | 2015-06-10 | 2015-06-10 | RC charge -discharge temperature measurement system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204831604U true CN204831604U (en) | 2015-12-02 |
Family
ID=54689195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520396028.1U Expired - Fee Related CN204831604U (en) | 2015-06-10 | 2015-06-10 | RC charge -discharge temperature measurement system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204831604U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644139A (en) * | 2017-02-16 | 2017-05-10 | 广东工业大学 | Temperature measurer based on platinum resistor |
-
2015
- 2015-06-10 CN CN201520396028.1U patent/CN204831604U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644139A (en) * | 2017-02-16 | 2017-05-10 | 广东工业大学 | Temperature measurer based on platinum resistor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102782512A (en) | Power source device and programmable controller | |
| CN204788450U (en) | Standard device of industrial safety in -line meter check gauge calibration usefulness | |
| CN208537050U (en) | A kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment | |
| CN203705992U (en) | Temperature control device | |
| CN102798481A (en) | Cold junction compensation temperature measurement method of thermocouple | |
| CN204831604U (en) | RC charge -discharge temperature measurement system | |
| CN105277292A (en) | Temperature measurement device | |
| CN104460469A (en) | Environmental sensor and environmental parameter measurement and prediction method | |
| CN203422170U (en) | Equipment for simultaneously monitoring temperatures of oil surface and winding of transformer | |
| CN202681919U (en) | Fast-forecast type electronic clinical thermometer | |
| CN201051023Y (en) | Probe for temperature and humidity measurement of big jujube drying room | |
| CN202066614U (en) | Fixed type temperature sensor for metering plant | |
| CN203561476U (en) | Electric pressure cooker and pressure detection device thereof | |
| CN203535468U (en) | Detector for temperature and humidity controller | |
| CN205280230U (en) | Synthesize thermoscope control system | |
| CN106644139A (en) | Temperature measurer based on platinum resistor | |
| CN202501930U (en) | Winding type thermometer used in transformer | |
| CN102680121A (en) | Intelligent indoor temperature acquirer | |
| CN206740263U (en) | A kind of thermocouple temperature measuring apparatus | |
| CN202562654U (en) | Temperature transmitter detector | |
| CN202853789U (en) | Temperature measurement sensor | |
| CN201497595U (en) | Transformer temperature measurer | |
| CN206618505U (en) | A kind of Thermistor Temperature Measurement system | |
| CN204085706U (en) | Wireless heating pipeline detected temperatures sensor | |
| CN103488164A (en) | Detector for temperature and humidity controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20151202 Termination date: 20160610 |