THERMAL INVARIANT METER OF LINEAR ACCELERATION Russian patent published in 2014 - IPC G01P15/00 

FIELD: measurement equipment.

SUBSTANCE: invention relates to measurement equipment, namely, to facilities for measurement of linear accelerations in systems of mobile objects control, for instance, to facilities for measurement of linear acceleration in platformless inertial navigation systems of space objects control. A meter comprises a quartz compensation pendulum accelerometer, a converter of voltage into frequency, a thermal system comprising the first bridge circuit of resistors, into one of arms of which the first thermal sensor is switched, being installed between the coil and the accelerometer body, a power amplifier, a heating coil covering the accelerometer body, the converter comprises a loading resistor R_fb, which is connected to the output of the feedback amplifier, a generator of sync frequency, an integrator, a charge resistor R_ch, two symmetrical circuits for conversion of positive and negative information, a reference voltage source, a comparator, a discharge resistor R_disc, a switching device, comprising an electronic key, a trigger, a clock pulse counter, and a shaper of pulse output information. A feature of the invention is the system of hardware compensation of temperature errors comprising the second bridge circuit of resistors, the second thermal sensor installed inside the accelerometer body and connected into one of the arms of the second bridge circuit, a metering amplifier, an inverter and four resistors R_1-4. Thermal invariance of the main parameters of the meter of linear accelerations - a scale coefficient and zero shift built on a quartz pendulum accelerometer and therefore having a substantial non-linear dependence of the specified parameters on temperature, is provided due to the fact that with the help of the available thermal system inside the accelerator a range of temperatures is provided, which corresponds to the linear section of the curve of dependence of the scale coefficient and zero shift on temperature, and with the help of the introduced system of hardware compensation into certain points of the voltage-frequency converter circuit the compensating voltages are supplied, which functionally depend on the current value of temperature inside the accelerometer and on temperature coefficients of the scale coefficient and zero shift of the accelerometer.

EFFECT: increased accuracy of measurements, reduced time of availability and energy consumption due to reduced impact of temperature at parameters of a linear acceleration meter.

6 dwg