A method of temperature compensation in pressure sensors.

摘要

The invention relates to a method for temperature compensation of pressure sensors of the type in which pressure is detected by a diaphragm ATTACHED TO AN ELECTRIC bridge circuit. The latter consists of four resistors (2, 3, 4, 5) connected in series to a bridge ring (1), what is called a Wheatstone bridge. VALUE OF THESE ELEMENTS IN RESPONSE TO CHANGES CHANGES IN THE CONFIGURATION DIAPHRAGM such as those caused by changes in the sensed pressure. IN COLON diagonally opposite (8, 9) BRIDGE TO A CONSTANT CURRENT (I SUB {K}) is supplied. FIRST POINTS OF MEASUREMENT OF OUTPUT SIGNALS DISPLACED LEAVING THE BRIDGE (1) pressure sensor to a range of temperature levels on a graph in which the voltage as a function RESISTANCE RESULTING (R REPRESENTED plotted { SUB, B}) BRIDGE (1) and then measuring points ADJACENT TO UNITE AND STRAIGHT LINES performs a calculation by interpolation between the measurement points. Detector sensitivity PRESSURE AS A UNIT OF TENSION / PRESSURE IS DETERMINED corresponding to different temperature levels FORM CHARTING A FEW SECONDS MEASUREMENT POINTS IN A SECOND GRAPHIC REPRESENTATIVE OF SENSITIVITY AS A FUNCTION OF RESISTANCE RESULTING (R { SUB, B}). Similarly JOIN THE LAST FORM MEASURING POINTS WITH STRAIGHT LINES MENTIONED AND performs a calculation by interpolation between the measurement points. CURVES RESULTING PROCESSED IN A COMPUTER, after which a signal from the pressure reading PROVIDES VALUE OF PRESSURE WITH DIRECTLY COMPENSATED TEMPERATURE CAN BE READ IN A THIRD graph representing an output signal proportional to the pressure DOMINANT.