Method and device for acquiring continuous physical quantity data

Abstract

Provided is a method for acquiring continuous physical signal such as temperature, pressure and the like. The method comprises the following steps: inputting a voltage signal u representing continuous physical signal; obtaining a sampled signal u k of an analog voltage through an analog sampling channel (1), wherein the sampling frequency is f”h; performing digital low-pass filtering on the u k (6) to obtain a voltage signal u k subjected to low-pass filtering, and resampling the u k to obtain a resample signal u j , wherein the resampling frequency f”y is the same as the sampling frequency required by an application terminal and the sampling frequency f”h is M times of the resampling frequency f”y; and storing and outputting the resample signal u j to the application terminal. Provided also is a corresponding device. The cost of the analog sampling channel is lowered; the u j can be directly applied to industrial automation for substitution of the u j , 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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Problems solved by technology

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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