Fiber-optic pressure instrument transducers

Fiber-optic instrument transducers with elastic sensors
Fig. 1 – Fiber-optic pressure instrument transducer design
Fig. 2 – Electrical functional circuit of the instrument transducer
1 - membrane;
2 - case;
3 - transmitting optical fibers;
4 - central receiving optical fiber.
5 - photodetector;
6 - LEDs.
5 - photodetector;
6 - LEDs;
7 - ADC converter;
8 - microchip;
9 - digital temperature sensor;
10 - digital numerical indicator;
11 - LED driver.

Fiber optic pressure sensor using a mathematical model of the measurement process
Fig. 3 – Fiber-optic pressure instrument transducer construction
Fig. 4 – Electrical functional circuit of the instrument transducer
1 - membrane sensor;
2 - case;
3 - transmitting optical fibers;
4 - receiving optical fiber;
5 - photodetector;
6 - LEDs.
5 - photodetector;
6 - LEDs;
7 - ADC converter;
8 - microcontroller;
9 - temperature sensor;
10 - indicator;
11 - LED driver.

Fiber optic pressure sensor with automatic compensation for temperature error
Fig. 5 – Fiber-optic pressure instrument transducer construction
Fig. 6 – Electrical functional circuit of the instrument transducer
1 - membrane;
2 - case;
3 - transmitting optical fibers;
4 - receiving fiber;
5 - photodetector;
6 - LEDs.
5 - photodetector;
6 - LEDs;
7 - ADC converter;
8 - microcontroller;
9 - temperature sensor;
10 - digital indicator;
11 - LED driver;
12 - piezoelectric element;
13 - ADC converter.

Fiber optic pressure sensor with integrated control
Fig. 7 – Fiber-optic pressure instrument transducer construction
Fig. 8 – Electrical functional circuit of the instrument transducer
1 - sensor;
2 - case;
3 - transmitting optical fibers;
4 - receiving fiber;
5 - photodetector;
6 - LEDs.
5 - photodetector;
6 - LEDs;
7 - ADC converter;
8 - microcontroller;
9 - temperature sensor;
10 - digital indicator;
11 - LED driver;
12 - amplifier.

Fiber optic pressure sensor with dynamically adjustable range
Fig. 9 – Fiber-optic pressure instrument transducer:
a – functional circuit; b – electric contacts of isolated pads connection circuit;
1- emission source, 2, 4 – optical fibers, 3 – sensor,
5 – receiver, 6 – data processing block, 7 – prism of complete internal reflection,
8 – isolated pads, 9 – reflecting membrane, 10 – switch block

Fiber optic pressure sensor with dynamically adjustable range and integrated control
a
b
Fig. 10– Fiber-optic instrument transducer with embedded control:
а – functional circuit,
b – electrical contacts of isolated pads connection circuit

Fiber optic pressure sensors for measuring the weight of moving objects
Fig. 11– Fiber-optic pressure instrument transducer’s sensor design
Fig. 12 – Simplified sensor’s design of a fiber-optic pressure instrument transducer