Dust concentration meter
A concentration meter and dust technology, applied in scientific instruments, measuring devices, suspension and porous material analysis, etc., can solve the problems of large measurement errors, difficult online monitoring of dust concentration, etc., and achieve accurate calculation and convenient calibration.
Active Publication Date: 2018-02-27
西石(厦门)科技股份有限公司
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Problems solved by technology
The measurement principle of the capacitance method is simple, but there is not a one-to-one linear relationship between the capacitance measurement value and the concentration. The capacitance measurement value is easily affected by the phase distribution and flow pattern changes, resulting in large measurement errors; Accurate, but it needs to compare and measure the dust after sampling, it is difficult to realize the online monitoring of dust concentration
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Embodiment Construction
[0020] A dust concentration meter, see figure 1 , including a charge signal sensor, a primary amplifier circuit for generating a voltage signal Vout1, an optional gain operational amplifier circuit for generating a voltage signal Vout2, and an end-follower circuit for generating a voltage signal Vout3 and Vout4, as well as a main control chip and supporting components Analog-to-digital conversion and digital-to-analog conversion circuits.
[0021] The signal output terminal of the charge signal sensor is connected to the signal input terminal Signal of the primary amplifier circuit, the output terminal voltage signal Vout1 of the primary amplifier circuit is connected to the input terminal of the optional gain operational amplifier circuit, and the output terminal voltage signal Vout2 of the optional gain operational amplifier circuit It is connected to the input end of the end-follower circuit, the AC voltage signal Vout3 of the output end of the end-follower circuit is conne...
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The invention discloses a dust concentration meter. The dust concentration meter comprises a primary amplifier circuit used for generating a voltage signal Vout1, a selectable gain operational amplifier circuit used for generating a voltage signal Vout2, a tail end following circuit used for generating a voltage signal Vout3 and a voltage signal Vout4, a main control chip, and an analog-to-digital conversion circuit and a digital-to-analog conversion circuit matched with each other. According to the dust concentration meter provided by the invention, the direct component and alternating component of the pressure signals formed by a feeler lever electric charge induced electromotive force are extracted at the same time; the direct component and the alternating component are analyzed at the same time by the main control chip; besides, a feedback circuit is formed; a feedback signal consists of the direct component and a stimulating alternating component with biasing; a direct current signal and an alternating current signal are fed back at the same time, and the detected electrical charge is calculated more accurately; moreover, the programming gain calculation amplifier circuit is convenient for the calibration of the electrical charge formed by different dusts, so that the circuit is enabled to be suitable for dusts with different structures.
Description
technical field [0001] The invention belongs to the technical field of dust concentration measurement, and in particular relates to an instrument for online real-time detection of the discharge dust concentration. Background technique [0002] Dust concentration meters can be divided into environmental dust meters and pipeline dust meters according to different application fields. [0003] Ambient Dust Meters are used to measure dust or particulate matter concentrations in open spaces. It can be widely used in various industries for online real-time dust concentration monitoring of factories, working environments, work spaces, offices, outdoor spaces, etc., as well as monitoring of dust concentration in special industrial working environments such as mines and underground coal mines. [0004] The pipeline dust meter can be used to monitor the trend change of dust concentration in various flue gas pipelines, monitor the dust emission of fixed pollution sources, and control t...
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IPC IPC(8): G01N15/06
Inventor 叶嵩李根常守亮
Owner 西石(厦门)科技股份有限公司