Method and device for acquiring continuous physical quantity data
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A technology of data acquisition and physical quantity, applied in measuring devices, digital technology networks, recording of measured values, etc., can solve the problems of large output content, inconvenient direct application, and inconformity with data acquisition frequency, etc.
Active Publication Date: 2012-03-28
郝玉山
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Chinese invention patents ZL200910158375.x and ZL200910158370.7 (inventor: Hao Yushan, invention name "continuous physical quantity measurement device and method") have given the measurement and recording of the steady-state quantity and full-state quantity of general physical quantities, but the output The frequency does not meet the above data collection frequency, and the output content is also more (including start and end time, etc.), which is inconvenient to be directly applied to industrial automation
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[0049] figure 1 A method and device for data acquisition of continuous physical quantities are presented.
[0050] figure 1 Among them, it includes an analog sampling channel 1, a register 2, a bus 3 and a timing controller 4, and the inventor's contribution lies in that it also includes a re-sampling switch 5 and a digital low-pass filter 6. Input the voltage signal u of the continuous physical quantity, and give the sampling value u of the analog voltage after the analog sampling channel 1 k ;sample value u k The high frequency is filtered out by the digital low-pass filter 6 to avoid possible mixing errors in the subsequent re-sampling process, and the low-pass filtered signal is output filtered signal Output to the re-sampling switch 5 for re-sampling and output re-sampling value Stored in the register 2; the register 2 outputs data to the application end via the bus 3 under the control of the bus 3; the analog sampling channel 1 and the re-sampling switch 5 are co...
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Abstract
The invention provides a method for acquiring continuous physical quantity data such as temperature, pressure and the like. The method comprises the following steps: inputting a voltage signal (u) representing continuous physical quantity; obtaining a sampled signal (uk) of an analog voltage through an analog sampling channel, wherein the sampling frequency is f delta h; performing digital lowpass filtering on the (uk) to obtain a voltage signal subjected to lowpass filtering, and resampling to obtain a resample signal, wherein the resampling frequency f delta y is the same as the sampling frequency required by an application terminal and the sampling frequency f delta h is M times of the resampling frequency f delta y; and storing and outputting the resample signal to the application terminal. The invention also provides a corresponding device. According to the invention, the cost of the analog sampling channel is lowered; the device and method provided by the invention can be directly applied to industrial automation for substitution, especially output signals do not contain transient values, the requirements of a stable model on input quantity can be met, the random disturbance can be inhibited, and the measurement accuracy can be improved.
Description
technical field [0001] The present invention relates to continuous physical quantity measurement and data acquisition technology, especially to digital measurement and data acquisition methods for temperature, pressure, flow, voltage, concentration, current, voltage, power, rotational speed, etc. in thermal engineering, chemical industry, metallurgy, and electric power industries and circuits. Background technique [0002] In industrial automation, continuous physical quantities such as temperature, pressure, flow, voltage, and concentration need to be measured and data collected (hereinafter referred to as data collection). Usually, for continuous physical quantities, the analog signal is sampled according to the requirements of the application side through the analog sampling channel, and the sampling frequency is f Δy . In order to avoid frequency mixing, it is necessary to set an analog low-pass filter in the analog sampling channel, whose cut-off frequency f c <0....
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