CN111780895A - Heat measuring device - Google Patents
Heat measuring device Download PDFInfo
- Publication number
- CN111780895A CN111780895A CN202010640678.1A CN202010640678A CN111780895A CN 111780895 A CN111780895 A CN 111780895A CN 202010640678 A CN202010640678 A CN 202010640678A CN 111780895 A CN111780895 A CN 111780895A
- Authority
- CN
- China
- Prior art keywords
- container
- calorimetric
- temperature sensor
- constant
- standard
- 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.)
- Pending
Links
Images
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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention provides a heat measuring device. The calorimetric device comprises a calorimetric container, wherein a constant-temperature base is arranged in the calorimetric container, and the calorimetric container is connected with a vacuum pump through a vacuum pipeline; a first temperature sensor and a second temperature sensor are arranged on the constant-temperature base; a first standard source container/sample with known power is placed on the first temperature sensor, and a first standard resistor is arranged on the first standard source container; and a second electric heating standard source container with known power is placed on the second temperature sensor, and a second standard resistor is arranged on the second electric heating standard source container. The invention obviously expands the sample size and the range of measurement which can be accommodated by the calorimetric device, the range of measurement is greatly expanded from the previous single order of magnitude to milliwatt to watt level and is adjustable, the range adjustment is very convenient, and the invention is widely applicable to the measurement of various radioactive samples.
Description
Technical Field
The invention belongs to the field of nondestructive measurement of radioactive substances, and particularly relates to a heat measuring device.
Background
Radioactive substances have remarkable particularity, so that when the radioactive substances are analyzed, a certain difficulty often exists in adopting a conventional analysis method. However, since radioactive materials generate heat during decay, the heat can be measured by calorimetry, and the mass of the radionuclide can be calculated without destroying the sample.
At present, the disclosed radionuclide analysis heat consumption device (such as Chinese patent application CN106770458A, journal article 'plutonium quality calorimetry measurement' and the like) is generally designed according to the heat power range and the container size range of a sample to be measured, once the structure is solidified after molding, the measurement process is restricted by the structure, and the problems of narrow measurement range, limited measurement sample size, large environmental fluctuation influence and complex maintenance and repair operation exist, so that the adaptability of the radionuclide to different samples is influenced.
Disclosure of Invention
The invention provides a heat measuring device for solving the problems of narrow measuring range, limited size of a measured sample, large influence of environmental fluctuation and complicated maintenance and repair operation in the heat measuring device for radionuclide analysis.
The calorimetric device comprises a calorimetric container, wherein a constant-temperature base is arranged in the calorimetric container, and the calorimetric container is connected with a vacuum pump through a vacuum pipeline; a first temperature sensor and a second temperature sensor are placed on the constant temperature base, the first temperature sensor is connected with the first signal processing unit, and the second temperature sensor is connected with the second signal processing unit; a first standard source container/sample with known power is placed on the first temperature sensor, a first standard resistor is arranged on the first standard source container, and the first standard resistor is connected with a first constant power source; a second electric heating standard source container with known power is placed on the second temperature sensor, a second standard resistor is arranged on the second electric heating standard source container, and the second standard resistor is connected with a second constant power source.
According to one embodiment, the calorimetric container comprises a container body and a container lid.
Further, the container body is composed of two or more detachable sections.
Furthermore, the material of the calorimetric container is stainless steel.
Furthermore, the inner wall of the calorimetric container is provided with a reflecting layer.
According to one embodiment, a thermostatic heating element is provided on the calorimetric container.
According to one embodiment, a heat transfer support is provided between the calorimetric vessel and the thermostatic base.
According to one embodiment, the calorimetric container is provided with a gas release valve.
According to one embodiment, a vacuum system isolation valve is disposed on a vacuum line between the thermal receptacle and the vacuum pump.
According to one embodiment, a vacuum gauge is provided on the calorimetric vessel.
The calorimeter of the invention adopts a unique design structure consisting of a first standard source container/sample with known power, a first temperature sensor, a second electrothermal standard source container with known power, a second temperature sensor and a constant temperature base, the design structure not only changes the strict limitation of the prior radionuclide analysis calorimeter on the sizes of the sample, the standard source container/sample, the temperature sensor and other structures, but also ensures that the temperature sensor is very convenient to replace, thereby obviously expanding the size and the range of the sample which can be accommodated by the calorimeter, ensuring that the size of the measurable sample of the radionuclide analysis calorimeter can be adjusted according to the actual requirement, even independently designed and assembled, the range of the range is greatly expanded from the prior single standard source container/sample to milliwatt level and is adjustable, and the order of the range is very convenient to adjust, the method is widely applicable to the measurement of various radioactive samples. The material with proper heat conductivity coefficient is selected as the heat transfer supporting piece between the heat container and the constant temperature base, so that the temperature fluctuation of the environment where the container is located can be effectively buffered, the constant temperature function of the base is further ensured, and the influence of the environment fluctuation on the measurement result is obviously reduced.
Drawings
Fig. 1 is a schematic view of a calorimetric device according to an embodiment of the invention.
Reference numerals: 1. the constant-temperature vacuum measurement device comprises a calorimetric container, 2, a constant-temperature heating element, 3, a constant-temperature base, 4, a heat transfer support, 5, an air release valve, 6, a vacuum system isolation valve, 7, a vacuum pump, 8, a first standard source container/sample, 9, a first standard resistor, 10, a first constant power source, 11, a first temperature sensor, 12, a first signal processing unit, 13, a second electric heating standard source container, 14, a second standard resistor, 15, a second constant power source, 16, a second signal processing unit, 17, a second temperature sensor and 18, and a vacuum gauge.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.
Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of embodiments of the invention and should not be construed as limiting the invention. The various components in the drawings are not to scale in order to clearly illustrate the details of the various components, and so the proportions of the various components in the drawings should not be taken as limiting.
The calorimetric device comprises a calorimetric container 1, wherein a constant-temperature base 3 is arranged in the calorimetric container 1, and the calorimetric container 1 is connected with a vacuum pump 7 through a vacuum pipeline; a first temperature sensor 11 and a second temperature sensor 17 are placed on the constant temperature base 3, the first temperature sensor 11 is connected with the first signal processing unit 12, and the second temperature sensor 17 is connected with the second signal processing unit 16; a first standard source container/sample 8 with known power is placed on the first temperature sensor 11, a first standard resistor 9 is arranged on the first standard source container, and the first standard resistor 9 is connected with a first constant power source 10; a second electric heating standard source container 13 with known power is placed on the second temperature sensor 17, a second standard resistor 14 is arranged on the second electric heating standard source container 13, and the second standard resistor 14 is connected with a second constant power source 15.
The calorimetric device adopts the design structure that the first standard source container/sample 8 and the first temperature sensor 11, and the second electric heating standard source container 13 and the second temperature sensor 17 are stacked on the constant temperature base 3, so that the size selection scope of the structures such as the sample, the standard source container/sample and the temperature sensor is obviously expanded, the simple stacked structural design also enables the temperature sensor to be conveniently replaced, the range of the calorimetric device is obviously expanded, and the range is also very convenient to adjust. The shape of the calorimetric vessel 1 can be selected according to the actual situation. The constant temperature base 3 plays a role in heat transfer and constant temperature, and heat accumulation and temperature fluctuation of the temperature sensor are obviously reduced; the thermostatic base 3 can be made of a material with large specific heat capacity and large heat conductivity coefficient, such as aluminum. The vacuum pump 7 is used for evacuating the calorimetric vessel 1. Each signal processing unit is used for processing the signals acquired by the corresponding temperature sensor. Each standard resistor and the constant power source are used for heating the corresponding electric heating standard source container.
According to one example, the calorimetric container 1 comprises a container body and a container lid, facilitating operation of the calorimetric process.
Furthermore, the container body is composed of two or more detachable sections, and the detachable sections can be connected by flanges, so that the internal accommodating space of the calorimetric container 1 is further expanded, and the application range of the calorimetric device is further expanded.
Further, the material of the calorimetric container 1 is stainless steel.
Further, the inner wall of the calorimetric container 1 is provided with a reflecting layer, so that the measurement accuracy is improved.
According to an example, a constant temperature heating element 2 is arranged on the calorimetric container 1 to keep the calorimetric container 1 at a constant temperature, so that the constant temperature of the calorimetric container 1 is realized, and the measurement accuracy is improved.
According to an example, a heat transfer support 4 is arranged between the calorimetric container 1 and the thermostatic base 3, and the heat conductivity coefficient of the support is properly small so as to buffer the temperature fluctuation of the environment where the container is located and further guarantee the thermostatic function of the base.
According to an example, the calorimetric container 1 is provided with a gas release valve 5, so that the vacuum state of the calorimetric container 1 can be relieved conveniently.
According to an example, a vacuum system isolation valve 6 is arranged on a vacuum pipeline between the calorimetric container 1 and the vacuum pump 7, so that the control of a vacuum system is facilitated.
According to an example, the calorimetric container 1 is provided with a vacuum gauge 18, so that the monitoring of the vacuum degree is facilitated.
The calorimeter of the invention is adopted to measure a batch of radioactive samples, and the main measuring process is as follows:
constant temperature: the calorimetric container 1 is heated by the constant temperature heating element 2, and the temperature of the calorimetric container 1 is kept constant.
(II) vacuumizing: starting the vacuum pump 7 and opening the air valve of the vacuum system, and pumping the vacuum degree in the calorimetric container 1 to a set value and keeping the vacuum degree constant.
(III) checking: setting a series of power values W1 for an electric heating simulator in the electric heating simulation container, adopting PID control algorithm feedback calculation, adjusting electric heating power W2 applied to an electric heating standard source in the second electric heating standard source container 13, enabling a real-time difference value between a thermoelectric force signal of the electric heating standard source in the second electric heating standard source container 13 and a thermoelectric force signal generated by W1 to approach zero until the real-time difference value is stably reset to zero, obtaining W2 in real time at the moment as an apparent power value of W1, and obtaining a power standard curve by measuring a series of apparent power values W2 of W1.
(IV) measuring: and replacing the first standard source container with the sample, obtaining the measured value of the sample by adopting an active measurement method, and obtaining the thermal power value of the sample through a standard curve.
The application result shows that: the calorimetric device has the advantages of simple structure, wide range of measurable sample size, wide range of measurement, high sensitivity, convenient use, flexibility, small environmental influence and the like, and has wide market prospect.
Although a few embodiments in accordance with the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
Claims (10)
1. A heat measuring device, characterized in that: the calorimetric device comprises a calorimetric container, wherein a constant-temperature base is arranged in the calorimetric container, and the calorimetric container is connected with a vacuum pump through a vacuum pipeline; a first temperature sensor and a second temperature sensor are placed on the constant temperature base, the first temperature sensor is connected with the first signal processing unit, and the second temperature sensor is connected with the second signal processing unit; a first standard source container/sample with known power is placed on the first temperature sensor, a first standard resistor is arranged on the first standard source container, and the first standard resistor is connected with a first constant power source; a second electric heating standard source container with known power is placed on the second temperature sensor, a second standard resistor is arranged on the second electric heating standard source container, and the second standard resistor is connected with a second constant power source.
2. The heat metering device of claim 1, wherein: the calorimetric container comprises a container body and a container cover.
3. The heat metering device of claim 2, wherein: the container body is composed of two or more detachable sections.
4. The heat measuring apparatus according to claim 2 or 3, characterized in that: the material of the calorimetric container is stainless steel.
5. The heat measuring apparatus according to claim 2 or 3, characterized in that: and a reflecting layer is arranged on the inner wall of the calorimetric container.
6. The heat metering device of claims 1-3, wherein: and a constant-temperature heating element is arranged on the calorimetric container.
7. The heat metering device of claims 1-3, wherein: and a heat transfer support is arranged between the calorimetric container and the constant temperature base.
8. The heat metering device of claims 1-3, wherein: and the calorimetric container is provided with a vent valve.
9. The heat metering device of claims 1-3, wherein: and a vacuum system isolation valve is arranged on a vacuum pipeline between the calorimetric container and the vacuum pump.
10. The heat metering device of claims 1-3, wherein: and a vacuum gauge is arranged on the calorimetric container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010640678.1A CN111780895A (en) | 2020-07-06 | 2020-07-06 | Heat measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010640678.1A CN111780895A (en) | 2020-07-06 | 2020-07-06 | Heat measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111780895A true CN111780895A (en) | 2020-10-16 |
Family
ID=72759016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010640678.1A Pending CN111780895A (en) | 2020-07-06 | 2020-07-06 | Heat measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111780895A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415045A (en) * | 2020-10-19 | 2021-02-26 | 武汉大学 | Device and method for measuring material thermal adaptation coefficient under low air pressure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2831066Y (en) * | 2005-06-27 | 2006-10-25 | 王富元 | Calorimetric cup and comparative calorimeter device |
| CN101275921A (en) * | 2006-12-21 | 2008-10-01 | 精工电子纳米科技有限公司 | Differential scanning calorimeter |
| US20090034579A1 (en) * | 2004-02-10 | 2009-02-05 | Christoph Schick | Differential Scanning Calorimeter (DSC) With Temperature Controlled Furnace |
| CN101561406A (en) * | 2009-03-06 | 2009-10-21 | 青岛大学 | Calorimetric method and instrument for measuring activity of water |
| CN103837214A (en) * | 2014-03-25 | 2014-06-04 | 重庆市计量质量检测研究院 | Combined container type gas flow detection device by pVTt method |
| CN106770455A (en) * | 2016-12-05 | 2017-05-31 | 西南科技大学 | A kind of new combustion heat determination method |
| CN106770458A (en) * | 2017-03-06 | 2017-05-31 | 中国工程物理研究院材料研究所 | Tritium gas tritium-containing amount measurement apparatus and method |
-
2020
- 2020-07-06 CN CN202010640678.1A patent/CN111780895A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090034579A1 (en) * | 2004-02-10 | 2009-02-05 | Christoph Schick | Differential Scanning Calorimeter (DSC) With Temperature Controlled Furnace |
| CN2831066Y (en) * | 2005-06-27 | 2006-10-25 | 王富元 | Calorimetric cup and comparative calorimeter device |
| CN101275921A (en) * | 2006-12-21 | 2008-10-01 | 精工电子纳米科技有限公司 | Differential scanning calorimeter |
| CN101561406A (en) * | 2009-03-06 | 2009-10-21 | 青岛大学 | Calorimetric method and instrument for measuring activity of water |
| CN103837214A (en) * | 2014-03-25 | 2014-06-04 | 重庆市计量质量检测研究院 | Combined container type gas flow detection device by pVTt method |
| CN106770455A (en) * | 2016-12-05 | 2017-05-31 | 西南科技大学 | A kind of new combustion heat determination method |
| CN106770458A (en) * | 2017-03-06 | 2017-05-31 | 中国工程物理研究院材料研究所 | Tritium gas tritium-containing amount measurement apparatus and method |
Non-Patent Citations (1)
| Title |
|---|
| 王燕伶 等: "测量物料热功率的量热计物理设计", 《科技风》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415045A (en) * | 2020-10-19 | 2021-02-26 | 武汉大学 | Device and method for measuring material thermal adaptation coefficient under low air pressure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0020545A1 (en) | A differential calorimeter based on the heat leak principle | |
| CN106338323B (en) | A kind of flowmeter in-situ calibration method and verification system | |
| US3075377A (en) | Apparatus for determining thermal conductivity of materials | |
| Hasegawa et al. | The NBS two-pressure humidity generator, mark 2 | |
| CN111780895A (en) | Heat measuring device | |
| US5099441A (en) | Method for determining thermal conductivity incorporating differential scanning calorimetry | |
| JP4908707B2 (en) | How to correct gravimetric error during microwave heating | |
| DK176757B1 (en) | U value measure | |
| JPH09502551A (en) | Method and device for constant temperature | |
| Zandt et al. | Capabilities for dielectric-constant gas thermometry in a special large-volume liquid-bath thermostat | |
| US2733602A (en) | Jackson | |
| Dole et al. | Calorimetry of high polymers. I. Automatic temperature recording and control of adiabatic jackets | |
| WO1991014161A1 (en) | Thermal sensing | |
| Zandt et al. | Dielectric-constant gas-thermometry measuring system for the determination of the Boltzmann constant at PTB | |
| EP0984273A3 (en) | Device for measuring thermophysical properties of solid materials and method therefor | |
| US3334230A (en) | Nuclear gauge standardization | |
| CN204903430U (en) | Isothermal storage test appearance | |
| Avdiaj et al. | Volume determination of vacuum vessels by gas expansion method | |
| CN203455299U (en) | Heat-flux-type differential scanning calorimeter | |
| Foster III et al. | A high pressure, high temperature device for measuring polymer compressibilities | |
| CN106353360A (en) | Testing device for thermal expansion coefficient of irregular-shaped material at low temperature | |
| JP2003344324A (en) | Isopiestic specific heat measurement method and apparatus therefor for high pressure fluid | |
| DK147009B (en) | EQUIPMENT FOR CALIBRATION OF INSTRUMENTS WITH A TEMPERATURE SENSOR UNIT | |
| Srinivasan et al. | Evaluation of immersion‐contact type heat transfer for continuous pharmaceutical spin freeze‐drying process | |
| RU154799U1 (en) | CALORIMETER FOR DETERMINING SPECIFIC HEAT CAPACITY OF FOOD PRODUCTS |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201016 |
|
| RJ01 | Rejection of invention patent application after publication |