PRECISION ANALOGUE-DIGITAL INTERFACE FOR WORKING WITH RESISTIVE MICRO- AND NANOSPHERES Russian patent published in 2015 - IPC G01D5/12 

FIELD: measurement equipment.

SUBSTANCE: invention relates to the field of measurement equipment and may be used in structure of various sensor systems, which use resistive sensors that vary their resistance under physical impact of environment (pressure, deformation, light, temperature, radiation, composition of various gases, moisture, etc.). The device comprises a measurement bridge, the first (1) output of the power supply diagonal of which is connected to the first (2) bus of the power supply source, the second (3) output of the power supply diagonal is connected to the second (4) common bus of the power supply source, and the first (5) and second (6) outputs of the measurement diagonal are connected to inputs of the first (7) differential instrument amplifier (DIA), the first (8) resistive sensor connected between the first (5) output of the measurement diagonal and the first (1) output of the power supply diagonal, the second (9) resistive sensor connected between the first (5) output of the measurement diagonal and the second (3) output of the power supply diagonal, the third (10) resistive sensor connected between the second (6) output of the measurement diagonal and the first (1) output of the power supply diagonal, the fourth (11) resistive sensor connected between the second (6) output of the measurement diagonal and the second (3) output of the power supply diagonal, the first (12) and second (13) auxiliary resistors, connected in series between the output (14) of the DIA (7) and the non-inverting input of the auxiliary OA (15), the inverting input of which is connected to the output (16) of this auxiliary OA (15), the first (17) correcting capacitor connected between the common unit (18) of the first (12) and second (13) auxiliary resistors and the output (16) of the auxiliary OA (15), the second (19) correcting capacitor connected between the non-inverting input of the auxiliary OA (15) and the second (4) common bus of the power supply bus, the first (20) ADC, the input of which is connected with the outlet (16) of the auxiliary OA (15). The circuit includes an additional DIA (21), the output of which (22) is connected to the input of the second (23) ADC, the first (24) input of the additional DIA (21) is connected to the common unit (18) of the first (12) and second (13) auxiliary resistors, and the second (25) input of the additional DIA (21) is connected to the non-inverting input of the auxiliary OA (15).

EFFECT: possibility to create both a digital equivalent of an input measured value (x) and a digital equivalent of its first derivative $$(\dot{x}),$$ and also production of a digital temperature value of sensors.

3 cl, 17 dwg