METHOD OF REMOTE MEASUREMENT OF PRESSURE AND TEMPERATURE IN HOLE BY ONE TRANSMITTER AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 1998 - IPC

FIELD: measurement technology, measurement of geophysical parameters of hole converted into change of resistance of resistive transmitter with use of four-wire communication line. SUBSTANCE: method of remote measurement of pressure and temperature in hole by one transmitter includes supply of current to supply diagonal of bridge and measurement of voltage across measurement diagonal. Supply and measurement diagonals are brought into coincidence with change of direction of supply current of bridge. Second voltage is measured. Values of pressure and temperature are found by calculation. Device for remote measurement of pressure and temperature in hole by one transmitter has tensobridge, four-wire communication line, source of electric energy, measuring-computing unity. Source of electric energy has two poles. Two decoupling diode networks are inserted, they are connected with one leads to source of electric energy and with other leads - in parallel to resistance strain gauges. Resistance strain gauges are placed into opposite arms of tensobridge. Measuring-computing unit is connected to measurement diagonal of tensobridge. EFFECT: increased measurement precision and simplified design of device thanks to expulsion of nonlinear key elements out of measurement circuit and suppression of influence of resistance of wires of communication line. 2 cl, 2 dwg