Device for measuring multi-passage heat conductivity
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A measuring device and multi-channel technology, applied in measuring devices, measuring heat, using electrical devices, etc., can solve problems such as low work efficiency
Inactive Publication Date: 2010-11-10
CHINA UNIV OF GEOSCIENCES (WUHAN) +1
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According to the derivation formula of thermal conductivity, the thermal excitation power must be constant, so it is required that the heating power of each channel in each circuit of the device must be kept as constant as possible during the entire heating process. At the same time, in order to improve the working efficiency per unit time, this device adopts Multi-channel measurement design to solve the problem of low work efficiency caused by long-term waiting for the ambient temperature balance of single-channel measurement. In order to ensure accurate and reliable measurement results, each channel should be compatible with each other in addition to being able to switch stably, that is, through any The thermal conductivity values measured by the channel are consistent within the allowable range of measurement error
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Embodiment 1
[0034]Embodiment 1: A kind of multi-channel thermal conductivity measuring device of the present invention, the structure is as follows figure 1 , including power supply module, upper computer, main control module, optocoupler isolation module, thermal pulse control and excitation module, multi-channel control module and temperature acquisition module;
[0035] The upper computer is respectively connected to the single chip microcomputer of the main control module and the six and a half multimeter in the temperature acquisition module through USB;
[0036] After each I / O of the microcontroller in the main control module is isolated by an optocoupler, they are respectively connected to the thermal pulse control and excitation module, the multi-channel control module and the temperature acquisition module;
[0037] The thermal pulse control and excitation module includes a power calibration module, a DA conversion module, a high-precision constant current source circuit and a he...
Embodiment 2
[0054] Embodiment 2: The multi-channel thermal conductivity measuring device of the present invention of application embodiment 1 is used to measure the thermal conductivity of rock, and the measurement work process is:
[0055] ① First insert the probe into the rock medium;
[0056] ② Turn on the host computer and single-chip microcomputer, run the measurement software, and the temperature acquisition module in the device first judges whether the ambient temperature is stable;
[0057] ③ After meeting the temperature balance conditions, first set the corresponding heating power on the host computer according to the rock medium;
[0058] ④The single-chip microcomputer realizes the gating of the channel through the switching action of the field effect tube, and the device controls the high-precision constant current source to generate current through the high-speed single-chip microcomputer, and the current flows through the gated channel through the heating wire to generate he...
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Abstract
The invention relates to a device for measuring the multi-passage heat conductivity, comprising two paths of independent power modules, an upper computer, a main control module, a photon coupled isolation module, a heat pulse control and excitation module, a multi-passage control module and a temperature collection module. The upper computer is respectively connected with a singlechip of the main control module and a multimeter in the temperature collection module through a USB; each I / O in the singlechip is respectively connected with the heat pulse control and excitation module, the multi-passage control module and the temperature collection module after being subjected to photo coupled isolation; the device is provided with two constant-current source circuits and adopts closed loop feedback to realize power constant value output; the multi-passage control module comprises a heating module and a measuring module which both have eight paths of passages; and the main control module selects any passage for collecting, preserving and calculating data in real time. The device has the advantages of convenient measurement, little error, high efficiency, and the like, meets the requirement of high-precision heat conductivity test, and can be further used for testing and researching the heat conductivity of solid body, powder, biological tissue, and the like.
Description
Technical field [0001] The invention relates to a multi-channel thermal conductivity measuring device, in particular to a device mainly suitable for measuring the thermal conductivity of rocks, and also applicable to testing and researching the thermal conductivity of solids, powders, biological tissues and the like. Background technique [0002] The methods of rock thermal conductivity measurement can be divided into two categories: steady-state measurement and unsteady-state measurement. Among them, the steady-state test is the main method to measure the thermal conductivity of rocks. However, due to the gradual expansion of geothermal research work to different geological regions and engineering application fields, a considerable part of the obtained rock samples are relatively soft mudstone, shale and weakly cemented sandstone, etc., which cannot be processed into rocks required by the steady-state test method. pie or disc. Sometimes due to the limitations of drilling ...
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