Equivalent periodic temperature measurement calculation table consulting method

Abstract

The invention discloses an equivalent periodic temperature measurement calculation table consulting method, which belongs to the field of industrial temperature automatic measurement. The method comprises the following steps: acquiring a corresponding temperature value very other R resistance for thermal resistors, and working out a one-dimension table by using products of the temperature values and K, wherein R is more than 0 and K is more than or equal to 10; selecting a known thermal resistor, measuring voltages at the two ends of the known thermal resistor and voltages at the two ends of a thermal resistor to be tested, and working out the resistance of the resistor to be tested after the temperature is amplified by K times; obtaining an index N' which corresponds to a first resistance which is smaller than the resistance of the thermal resistor to be tested, but is most close to the resistance of the thermal resistor to be tested by using integer operation, wherein N' is a positive integer; and consulting the table to obtain a temperature value corresponding to the index N' and a temperature value corresponding to an index N'+1, and calculating the temperature of the thermal resistor to be tested. The method solves the problem that the different table consulting times of different resistances lead to uncertain execution period during temperature measurement of a thermal resistor.

Description

technical field [0001] The invention relates to the field of automatic measurement of industrial temperature, in particular to a table look-up method for equal-period temperature measurement and calculation. Background technique [0002] In the industrial automation temperature measurement and control system, when measuring and calculating the temperature parameters in the industrial production process, the commonly used microprocessor look-up table method is used to calculate the temperature measurement value. It is more common to use thermal resistance to measure temperature in industry, and the platinum resistance of temperature measuring element type is Pt100 is the most commonly used (due to the linearity, stability and accuracy of platinum resistance Pt100). Generally, the method of measuring temperature with a thermal resistance often uses a constant current source I to measure the voltage at both terminals of the resistance through the measured resistance, then use t...

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Problems solved by technology

[0020] The purpose of the present invention is to overcome the defects of the prior art and provide a method of temperature measurement and calculation table look-up with equal periods, and eliminate the problem that the time of the table look-up table for different resistance values ​​is different each time when the temperature of the thermal resistance is used for temperature measurement, resulting in an uncertain program execution cycle.