Thermocouple vacuum meter
A technology of vacuum gauge and thermocouple, which is applied to vacuum gauges that measure medium pressure by measuring changes in the thermal conductivity of the medium, and can solve problems such as limited pressure measurement range and limited voltage range
Active Publication Date: 2012-06-13
CHENGDU GUOGUANG ELECTRIC
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Problems solved by technology
[0004] However, the current terminal of the thermocouple vacuum gauge in the current thermocouple vacuum gauge inputs a fixed current, and the tested voltage range is limited, and the pressure range that can be output and displayed is 0.1 Pa to hundreds of Pa, that is, the pressure measurement range is limited
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[0033] The current terminal of the thermocouple vacuum gauge in the existing thermocouple vacuum gauge can only input a fixed current. When the conductor in the thermocouple circuit in the thermocouple vacuum gauge is under the action of a fixed current, the voltage range generated by it is limited, and further Thermocouple gauges have a limited output pressure range. In order to solve the above problems, an embodiment of the present invention provides a thermocouple vacuum gauge, which can provide different currents to the current terminals of the thermocouple vacuum gauge, thereby increasing the output voltage and further broadening the pressure measurement range.
[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not al...
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The invention discloses a thermocouple vacuum meter comprising a thermocouple vacuum gauge, an amplification apparatus, an analog-to-digital converter (ADC), a microcontroller, a voltage conversion apparatus and a current adjusting apparatus. According to a technical scheme, the microcontroller generates different digital voltages according to different comparison results; furthermore, the voltage conversion apparatus converts the digital voltages into analog voltages; when the current adjusting apparatus receives the different analog voltages sent by the voltage conversion apparatus, different currents are generated by the current adjusting apparatus and are output to a current terminal of the thermocouple vacuum gauge; therefore, different currents can be input into the current terminalof the thermocouple vacuum gauge; and thus, a voltage rang that is output by the thermocouple vacuum gauge is enlarged and a pressure measurement range can be further widened. On the basis of multiple experiments, the inventor draws a conclusion that the thermocouple vacuum meter employing the above-mentioned technical scheme has an advantage that a pressure range displayed by the output is from 0.01pa to 999 pa; and compared with a current thermocouple vacuum meter, the provided thermocouple vacuum meter enables an upper limit and a lower limit of its pressure measuring range to be broadenedobviously.
Description
technical field [0001] The invention relates to the technical field of measuring equipment, and more specifically, relates to a thermocouple vacuum gauge. Background technique [0002] As a vacuum measurement instrument, the thermocouple vacuum gauge has the characteristics of high stability, accurate measurement, continuous measurement and long service life within its measurement range. According to the current user requirements, miniaturized, integrated and intelligent thermocouple vacuum gauges are the future development direction, and the research on integrated miniature thermocouple vacuum gauges is of great significance. [0003] The thermocouple vacuum gauge includes a thermocouple vacuum gauge, a triode, an ADC (Analog To Digital Converter, analog-to-digital converter) and a single-chip microcomputer. Wherein: the current end of the thermocouple vacuum gauge is connected with a fixed current, the voltage end is connected with the triode, and the ADC is connected bet...
Claims
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IPC IPC(8): G01L21/14
Inventor 胡鹏飞李泞
Owner CHENGDU GUOGUANG ELECTRIC