The document discusses sensors, defining them as devices that measure physical quantities and convert them into signals. It describes qualities of good sensors such as sensitivity and lack of influence on the measured property. Additionally, it covers common sensor types, errors, and measurement definitions like sensitivity, deviation, and resolution.

1. Instructed on: 09-Dec-2011 | Session: #04
Basics & Applications
By: Mohanad Yehia
Topic Code: TCW-03-2012
All Copy Rights Saved to the 7th Students’ Conference on Communication and Information Based in the Faculty of Computers and Information Cairo University – Egypt 2011/2012 www.scci-cu.com

2.  What’s a Sensor?!
 Sensors’ quality
 Measurement definitions
 Common errors
 Sensors types

4. A sensor is a device that measures a
physical quantity and converts it into
a signal which can be read by an
observer or by an instrument.

6. A good sensor should be:
• Sensitive to the measured property.
• Insensitive to any other property likely to be
encountered while measurement.
• Does not influence the measured property.

8. Sensitivity
Deviation
Resolution

10. A sensor's sensitivity indicates how much
the sensor's output changes when the
measured quantity changes.

12. It’s difference between the real value of
the property and the average value of the
measurements of that property.

14. The resolution of a sensor is the smallest
change it can detect in the quantity that it
is measuring.

16.  The output signal is NOT zero when the
measured property is zero.
 The sensitivity is not constant over the
range of the sensor.
 The output signal slowly changes
independent of the measured property.

17.  Most
sensors are affected by
temperature.
 The approximation of the output value.

19.  Parking sensors: used to alert the driver of
unseen obstacles during parking maneuvers.

20.  Speedometer: used to measure the
instantaneous speed of a land vehicle.

21.  Fuel meter: used to measure the level of fuel
in the tank.

22.  Rain Sensor.

23.  Breathalyzer.

24.  Photoelectric Sensor.

25.  Carbon dioxide sensor.

26.  PH glass electrode.

27.  Smoke detector.

28. More!!!
Check this link:
http://en.wikipedia.org/wiki/List_of_sensors