a little knowledge about Fiber optic transducer, smart sensor, micro sensor, smart transducer

1. Recent
Developments
By:
Manash Pratim Deka

2. Recent Developments
In the form of
Fibre optic transducers
Micro-sensors
Smart sensors
Smart transmitters.

3. Computer Aided Measurements
• There are many sensors involved in measurement,
analysis, transmission and data storage provided by
digital computers.
• A computer sends or receives information to an
experimental setup, involving a number of sensors where
a huge amount of data storage is required.
• Due to a large number of analog transducers, A-D
converters are to be used between sensors and
computers to perform the tasks.
• If used for control purposes, the stored digital data is
converted to analog form by D-A converters and it is given
to the final analog control elements of the system.

4. Fiber Optic Transducer
Fiber optic transducers are the latest concept of
sensors.
They work on the principle of alteration by external
variables like temperature, strain, pressure, particle
size, density etc.
Fiber optics work as light conduit (path) to conduct
light and is made of dielectric materials like glass and
plastic.
A light ray propagating in a fiber is trapped by
reflection at the outer shielding of the boundary of the
core and cladding.

5. Advantages of Fiber optic transducer:
Numerous signals can be sent through
the fiber without any interference.
Enhanced safety due to non-metallic
construction and low weight and small size as
well as small sensor size.
Disadvantage of Fiber optic transducer:
Requires careful packaging.
High cost.

6. Smart Sensors
Integrating the sensing element of a sensor
and signal processing part on the same
integrated chip, the idea of SMART sensor has
been developed.
Sensing and signal processing has become
more and more precise and reliable.
Existence of microprocessor and memory
mainly contributes to the signal processing and
decision making power of the smart sensor.

7. Micro-sensors
The fabrication of mechanical devices on a
silicon wafer of very small dimension (1-10
μm) gives rise to a micro sensor.
These devices may be cantilevers, nozzles,
cavities, diaphragms or membranes, small
bridges, mechanical resonators etc.
As yield strength is high and density of silicon
is less than that of steel, it is easy to be
machined on the micron order.

8. Smart Transmitters
Smart transmitters can be built with the help of
semiconductor devices.
They can store data digitally for the purpose of
linearization, correction for sensor non-linearities
and for temperature and pressure compensation.
Advantage of smart transmitters is the
automatic relating at the start of the control and
they can be used for two way communication
between the field transducer and the controller.

9. THANK
YOU