CN108680286A - One kind is for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment - Google Patents
One kind is for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment Download PDFInfo
- Publication number
- CN108680286A CN108680286A CN201810723663.4A CN201810723663A CN108680286A CN 108680286 A CN108680286 A CN 108680286A CN 201810723663 A CN201810723663 A CN 201810723663A CN 108680286 A CN108680286 A CN 108680286A
- Authority
- CN
- China
- Prior art keywords
- heat flow
- temperature
- constant
- flow signal
- warm area
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
- G01K17/06—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device
- G01K17/08—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device based upon measurement of temperature difference or of a temperature
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention discloses one kind for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment, by two-way constant-current source circuit, heat flow transducer, Low Drift Temperature low noise amplifier module and circuitry for signal measurement composition, two-way constant-current source circuit adjustable band is fed back, two couple symmetrical platinum filament thermometric thermal resistance power supply of the constant-current source circuit to heat flow transducer, temperature difference is calculated by the voltage difference that two groups of platinum filament thermometric thermal resistances generate, to generate differential thermal signal, differential thermal signal is amplified by one group of Low Drift Temperature low noise amplifier module again, finally the Σ Δ analog-to-digital conversion devices by high-precision discriminating rate up to 24 acquire measurement.Compared with prior art, the present invention having the characteristics that：1, heat flow transducer has paramagnetism, is not influenced by strong magnetic environment.2：Heat flow transducer temperature-measuring range is wide.3：The heat flow signal that heat flow transducer generates is big, reproducible.4：The amplification module band magnetic screen of heat flow signal, constant temperature shell eliminate noise, temperature drift influences.
Description
Technical field
It is specifically a kind of for high-resolution hot-fluid under the wide warm area of high magnetic environment the present invention relates to heat flow signal fields of measurement
Signal Measurement System.
Background technology
Magnetic environment can mutually be formed to the object of material and performance has an impact, and is more than the height of 1 tesla in magnetic density
Under magnetic field environment, temperature range is tested in 100K to 973K, has important scientific value to material new phenomenon and mechanism study.
Therefore manufacture measured for the thermal-analysis instrumentation that wide warm area range uses under magnetic environment material object mutually formed and performance very
It is significant.
The most crucial technology of differential scanning calorimeter is to measure heat flow signal, and heat flow signal is to measure sample temperature and reference
What the temperature difference of object generated.Conventional heat flow signal is surveyed by the chromel-constantan thermocouple Opposite direction connection of two same models
Amount, heat flow signal range is between -1000uV to 1000uV, and the resolution requirement of signal is within ± 0.05uV.High magnetic environment
Magnetic flux range be 1-15 teslas, chromel-constantan thermocouple belongs to ferrimagnet, the potential generated under high magnetic environment
Relatively large deviation is will produce, so as to cause the deviation of heat flow signal.According to platinum rhodium 10- platinum paramagnetic material thermocouples, can eliminate
The influence of magnetic environment, but platinum rhodium 10- platinum thermocouples are unable to measure 200K temperature below.Therefore it designs a kind of for can be used for magnetic
The method of high resolution measurement heat flow signal under the wide warm area of environment becomes the key of the thermal-analysis instrumentation of the wide warm area of magnetic environment.
Invention content
The technical problem to be solved in the invention be to provide it is a kind of can under the wide warm area of magnetic environment high resolution measurement hot-fluid
The method of signal realizes thermal analyzer analysis of material phenomenon and mechanism under magnetic environment.
Technical solution is as follows used by the present invention solves the above problems：
One kind is passed for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment by two-way constant-current source circuit, hot-fluid
Sensor, Low Drift Temperature low noise amplifier module and circuitry for signal measurement composition, two-way constant-current source circuit adjustable band feedback, constant current
Source circuit is generated to the symmetrical platinum filament thermometric thermal resistance power supply of two couples of heat flow transducer by two groups of platinum filament thermometric thermal resistances
Voltage difference calculates temperature difference, and to generate differential thermal signal, differential thermal signal is put by one group of Low Drift Temperature low noise amplifier module again
Greatly, the sigma-delta analog-to-digital conversion device finally by high-precision discriminating rate up to 24 acquires measurement.
Further, the constant-current source circuit is made of current output circuit, current regulating circuit and current collection circuit,
Current acquisition and current regulation form negative-feedback, control the precision of constant current source output current.
Further, the output current of the constant-current source circuit is 0.1mA, and output accuracy is ± 0.0001mA, temperature drift system
Number is less than 20ppm.
Further, the heat flow transducer divides three-decker, and bottom, middle layer and top layer, bottom is by high thermal conductivity
Aluminium nitride substrate forms, and middle layer is made of two pairs of full symmetric platinum filament thermometric thermal resistances, and platinum filament thermometric thermal resistance is equably
It is wrapped on ceramic skeleton, each pair of platinum filament thermometric thermal resistance draws two leads, is drawn from substrate through holes；Rest part is by height
The magnesia powder of insulating properties high thermal conductivity is filled；Top layer seals glaze layer using high temperature, realizes and is electrically isolated.
Further, the aluminium nitride substrate, platinum filament thermometric thermal resistance, lead, magnesia powder, high temperature envelope glaze layer are all
Paramagnetic material.
Further, the circuit part of the Low Drift Temperature low noise amplifier module is by Differential input circuit, primary amplification
Circuit and secondary amplification circuit composition, shell are thermostatic control metallic magnetic shield assembly.
Further, the thermostatic control metallic magnetic shield assembly is by heating tape, heat-preservation cotton, temperature transducer and external temperature
Device composition is controlled, thermostatic control component forms a temperature control loop, and control case temperature is in temperature constant state always.
Further, the extexine of the thermostatic control metallic magnetic shield assembly shell, using permalloy shielding case.
The design advantage of the present invention is as follows：1：The heat flow transducer that can be used under magnetic environment is designed, sensor measurement is surveyed
Warm range is wide, signal accuracy is high, repeated high, high resolution.2：Design provides the constant-current source electricity of heat flow transducer steady operation
Road, circuit ripple are small.3：The amplification module of high resolution measurement tiny signal is designed, amplification module noise jamming is low, temperature drift system
Number is low.
Compared with prior art, the present invention having the characteristics that：1, heat flow transducer has paramagnetism, not by strong magnetic environment
It influences.2：Heat flow transducer temperature-measuring range is wide.3：The heat flow signal that heat flow transducer generates is big, reproducible.4：Heat flow signal
Amplification module band magnetic screen, constant temperature shell, eliminate noise, temperature drift influence.
Description of the drawings
Fig. 1 is present system block diagram.
Fig. 2 is heat flow transducer exterior view of the present invention.
Fig. 3 is heat flow transducer structure chart of the present invention.
Fig. 4 is heat flow signal amplification module structure chart of the present invention.
Specific implementation mode
It is shown in Figure 1, it is of the invention for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment by two
Road constant-current source circuit, a heat flow transducer, a Low Drift Temperature low noise amplifier module and circuitry for signal measurement composition.
The principle of patent of the present invention is to provide two-way adjustable band feedback constant-current source circuit, and constant-current source circuit is passed to hot-fluid
The symmetrical platinum filament thermometric thermal resistance power supply of two couple of sensor, temperature is calculated by the voltage difference that two groups of platinum filament thermometric thermal resistances generate
Difference, to generate differential thermal signal.Differential thermal signal is amplified by one group of Low Drift Temperature low noise amplifier module again, finally by high-precision
Resolution ratio acquires measurement up to 24 sigma-delta analog-to-digital conversion devices.
The constant-current source circuit is made of current output circuit, current regulating circuit and current collection circuit.Current acquisition
Negative-feedback is formed with current regulation, controls the precision of constant current source output current.After adjusted, the output current of constant-current source circuit is
0.1mA, output accuracy are ± 0.0001mA, and temperature drift coefficient is less than 20ppm.
Heat flow transducer is core of the invention component, external structure as shown in Fig. 2, structure referring to Fig. 3.Heat flow transducer
Divide three-decker, bottom, middle layer and top layer.Bottom is made of the aluminium nitride substrate 1 of high thermal conductivity, that is, realizes electric isolution,
Uniformly transfer heat is realized again.Middle layer is made of two pairs of full symmetric platinum filament thermometric thermal resistances 3, and platinum filament thermometric thermal resistance 3 is equal
Even is wrapped on ceramic skeleton 2, and each pair of platinum filament thermometric thermal resistance 3 draws two leads 4, is drawn from substrate through holes.Remaining
It is filled by the magnesia powder 5 of high-insulativity high thermal conductivity part.Top layer is floor height temperature envelope glaze layer 6, realizes and is electrically isolated.Hot-fluid
The component part of sensor, aluminium nitride substrate 1, platinum filament thermometric thermal resistance 3, lead 4, magnesia powder 5, high temperature seal glaze layer 6, all
It is paramagnetic material, is not influenced by magnetic field under high magnetic field environments.Heat flow transducer is surveyed using platinum filament thermometric thermal resistance
Warm range can use in -73 ~ 1023K, can meet wide warm area and measure.The signal accuracy of platinum filament thermometric thermal resistance is in 0.5K
Within, and will not generate oxidation in high temperature section.
The heat flow signal generated by heat flow transducer is very faint, and the resolution requirement of signal is in ± 0.05uV.Faint
Noise and temperature drift can all influence the measurement of heat flow signal.The Low Drift Temperature low noise amplifier module of heat flow signal is the weight of the present invention
Want component, structure such as Fig. 4.The circuit part of Low Drift Temperature low noise amplifier module is by Differential input circuit, primary amplifying circuit
It is formed with secondary amplification circuit.Form amplifier Low Drift Temperature, the low noise of amplifying circuit.The shell of amplification module is a set of constant temperature
Control metallic magnetic shield assembly.Thermostatic control metallic magnetic shield assembly is by heating tape 7, heat-preservation cotton 8, temperature transducer 9 and external
Temperature controller forms, and thermostatic control component forms a temperature control loop, and control case temperature is in temperature constant state always.Amplifier mould
Block is run under isoperibol, is interfered eliminating by the temperature drift that variation of ambient temperature and amplifier itself generate.The appearance of shell
Layer, using permalloy shielding case, shielding extraneous magnetic field interference.
Amplified heat flow signal, the sigma-delta analog-to-digital conversion chip by resolution ratio up to 24 measure acquisition, signal resolution
Hundred a ten thousandths can be reached.
Claims (8)
1. one kind is for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment, by two-way constant-current source circuit, hot-fluid
Sensor, Low Drift Temperature low noise amplifier module and circuitry for signal measurement composition, it is characterised in that：Two-way constant-current source circuit is adjustable
Section band feedback, constant-current source circuit are surveyed to the symmetrical platinum filament thermometric thermal resistance power supply of two couples of heat flow transducer by two groups of platinum filaments
It warms the voltage difference that resistance generates and calculates temperature difference, to generate differential thermal signal, differential thermal signal passes through one group of Low Drift Temperature low noise again
Acoustic amplifier module is amplified, and finally the sigma-delta analog-to-digital conversion device by high-precision discriminating rate up to 24 acquires measurement.
2. being used for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment as described in claim 1, feature exists
In：The constant-current source circuit is made of current output circuit, current regulating circuit and current collection circuit, current acquisition and electric current
Adjusting forms negative-feedback, controls the precision of constant current source output current.
3. being used for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment, feature as claimed in claim 1 or 2
It is：The output current of the constant-current source circuit is 0.1mA, and output accuracy is ± 0.0001mA, and temperature drift coefficient is less than 20ppm.
4. being used for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment as described in claim 1, feature exists
In：The heat flow transducer divides three-decker, bottom, middle layer and top layer, bottom by high thermal conductivity aluminium nitride substrate（1）Group
At middle layer is by two pairs of full symmetric platinum filament thermometric thermal resistances（3）Composition, platinum filament thermometric thermal resistance（3）Equably it is wrapped in
Ceramic skeleton（2）On, each pair of platinum filament thermometric thermal resistance（3）Draw two leads（4）, drawn from substrate through holes；Rest part
By the magnesia powder of high-insulativity high thermal conductivity（5）It fills；Top layer seals glaze layer using high temperature（6）, realize and be electrically isolated.
5. being used for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment as claimed in claim 4, feature exists
In：The aluminium nitride substrate（1）, platinum filament thermometric thermal resistance（3）, lead（4）, magnesia powder（5）, high temperature seal glaze layer（6）All
It is paramagnetic material.
6. being used for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment as described in claim 1, feature exists
In：The circuit part of the Low Drift Temperature low noise amplifier module is by Differential input circuit, primary amplifying circuit and secondary amplification
Circuit forms, and shell is thermostatic control metallic magnetic shield assembly.
7. being used for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment as claimed in claim 6, feature exists
In：The thermostatic control metallic magnetic shield assembly is by heating tape（7）, heat-preservation cotton（8）, temperature transducer（9）With external temperature controller
Composition, thermostatic control component form a temperature control loop, and control case temperature is in temperature constant state always.
8. being used for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment as claimed in claim 7, feature exists
In：The extexine of the thermostatic control metallic magnetic shield assembly shell, using permalloy shielding case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810723663.4A CN108680286B (en) | 2018-07-04 | 2018-07-04 | High-resolution heat flow signal measuring system used under high-magnetic environment wide-temperature area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810723663.4A CN108680286B (en) | 2018-07-04 | 2018-07-04 | High-resolution heat flow signal measuring system used under high-magnetic environment wide-temperature area |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108680286A true CN108680286A (en) | 2018-10-19 |
| CN108680286B CN108680286B (en) | 2019-12-10 |
Family
ID=63813140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810723663.4A Active CN108680286B (en) | 2018-07-04 | 2018-07-04 | High-resolution heat flow signal measuring system used under high-magnetic environment wide-temperature area |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108680286B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111221358A (en) * | 2020-03-24 | 2020-06-02 | 杭州盘古自动化***有限公司 | Method for quickly and accurately adjusting micro atmosphere flow in magnetic environment |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2393286A1 (en) * | 1976-07-15 | 1978-12-29 | Vaillant Sa | CALORIMETRIC DEVICE FOR MEASURING THE QUANTITY OF HEAT SENT BY A FLUID TO A HEAT EXCHANGER |
| DE3130499A1 (en) * | 1981-07-23 | 1983-02-10 | Abel, Konrad, Prof. Dipl.-Ing., 6834 Ketsch | Method and circuit arrangement for measuring a temperature difference |
| DE3219788A1 (en) * | 1982-05-25 | 1983-12-01 | Siemens AG, 1000 Berlin und 8000 München | Flow-rate measuring device for fluids and modification of the flow-rate measuring device for use as calorimeter |
| US4768378A (en) * | 1986-02-04 | 1988-09-06 | Sharp Kabushiki Kaisha | Humidity detecting circuit |
| CN1800792A (en) * | 2005-05-26 | 2006-07-12 | 郭豫生 | Heat conduction sensor and measuring method thereof |
| CN201007805Y (en) * | 2007-01-08 | 2008-01-16 | 深圳市国冶星光电子有限公司 | Digital type adjustable constant-current constant voltage source |
| CN201926947U (en) * | 2010-12-29 | 2011-08-10 | 上海亨通光电科技有限公司 | Duty ratio adjustable current source based on singlechip control |
| CN103308214A (en) * | 2013-05-13 | 2013-09-18 | 华北电力大学 | Real-time heat flow detection device and real-time heat flow detection method thereof |
| CN104964759A (en) * | 2015-07-21 | 2015-10-07 | 华军 | Quick-response bimetal thermometer temperature bulb structure |
| CN105554940A (en) * | 2015-12-25 | 2016-05-04 | 北京经纬恒润科技有限公司 | Adaptive adjustment circuit for automotive load current |
-
2018
- 2018-07-04 CN CN201810723663.4A patent/CN108680286B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2393286A1 (en) * | 1976-07-15 | 1978-12-29 | Vaillant Sa | CALORIMETRIC DEVICE FOR MEASURING THE QUANTITY OF HEAT SENT BY A FLUID TO A HEAT EXCHANGER |
| DE3130499A1 (en) * | 1981-07-23 | 1983-02-10 | Abel, Konrad, Prof. Dipl.-Ing., 6834 Ketsch | Method and circuit arrangement for measuring a temperature difference |
| DE3219788A1 (en) * | 1982-05-25 | 1983-12-01 | Siemens AG, 1000 Berlin und 8000 München | Flow-rate measuring device for fluids and modification of the flow-rate measuring device for use as calorimeter |
| US4768378A (en) * | 1986-02-04 | 1988-09-06 | Sharp Kabushiki Kaisha | Humidity detecting circuit |
| CN1800792A (en) * | 2005-05-26 | 2006-07-12 | 郭豫生 | Heat conduction sensor and measuring method thereof |
| CN201007805Y (en) * | 2007-01-08 | 2008-01-16 | 深圳市国冶星光电子有限公司 | Digital type adjustable constant-current constant voltage source |
| CN201926947U (en) * | 2010-12-29 | 2011-08-10 | 上海亨通光电科技有限公司 | Duty ratio adjustable current source based on singlechip control |
| CN103308214A (en) * | 2013-05-13 | 2013-09-18 | 华北电力大学 | Real-time heat flow detection device and real-time heat flow detection method thereof |
| CN104964759A (en) * | 2015-07-21 | 2015-10-07 | 华军 | Quick-response bimetal thermometer temperature bulb structure |
| CN105554940A (en) * | 2015-12-25 | 2016-05-04 | 北京经纬恒润科技有限公司 | Adaptive adjustment circuit for automotive load current |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111221358A (en) * | 2020-03-24 | 2020-06-02 | 杭州盘古自动化***有限公司 | Method for quickly and accurately adjusting micro atmosphere flow in magnetic environment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108680286B (en) | 2019-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3256734A (en) | Heat transfer measuring apparatus | |
| Fleischmann et al. | Noise thermometry for ultralow temperatures | |
| CN108680286A (en) | One kind is for high-resolution heat flow signal measuring system under the wide warm area of high magnetic environment | |
| Brixy | Temperature measurement in nuclear reactors by noise thermometry | |
| Woods | The Conductivity of Sodium at Low Temperatures | |
| Afsarimanesh et al. | LabVIEW based characterization and optimization of thermal sensors | |
| Patronis et al. | Low‐Temperature Thermal Noise Thermometer | |
| Engert et al. | Noise thermometry at low temperatures: MFFT measurements between 1.6 K and 1 mK | |
| Sharma et al. | Experimental setup for the Seebeck and Nernst coefficient measurements | |
| CN108918939A (en) | A kind of current measuring device that high-precision is easy to install | |
| Wyngaard et al. | A constant temperature hot-wire anemometer | |
| Kirste et al. | A calculable and correlation-based magnetic field fluctuation thermometer | |
| Engert et al. | Practical noise thermometers for low temperatures | |
| Liu et al. | High spatial resolution Hall sensor array for edge plasma magnetic field measurements | |
| Katzmann et al. | Thin-film AC-DC converter with thermoresistive sensing | |
| Netsch et al. | Novel, non‐contact noise thermometer for Milli‐kelvin temperatures | |
| Clark | A semiautomatic calorimeter for measurement of effective efficiency of thermistor mounts | |
| Erickson | A fast, very sensitive calorimetric power meter for millimeter to submillimeter wavelengths | |
| Bäcklund | Measurement and analysis of the thermal conductivity of tungsten and molybdenum at 100–400 K | |
| Fan et al. | Performance of a precise infrared shadow sensor thermometer | |
| US3569710A (en) | Method for improving the signal-to-noise ratio of the wheatstone bridge type bolometer | |
| Sancier et al. | Simple Sensitive Electrical Pressure Gauge | |
| Yang et al. | Design of a high-precision, high environmental adaptability temperature measurement system for environments with large temperature variations | |
| US3533855A (en) | Electrical measurement devices | |
| JP2002188967A (en) | Magnetic field calibration method of thermometer having magnetic field dependency |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |