Basics & Applications

Instructed on: 09-Dec-2011 | Session: #04

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

By: Mohanad Yehia

What’s a Sensor?!

Sensors’ quality

Measurement definitions

Common errors

Sensors types

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.

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.

Sensitivity

Deviation

Resolution

A sensor's sensitivity indicates how much

the sensor's output changes when the

measured quantity changes.

It’s difference between the real value of

the property and the average value of the

measurements of that property.

The resolution of a sensor is the smallest

change it can detect in the quantity that it

is measuring.

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.

Most sensors are affected by

temperature.

The approximation of the output value.

Parking sensors: used to alert the driver of

unseen obstacles during parking maneuvers.

Speedometer: used to measure the

instantaneous speed of a land vehicle.

Fuel meter: used to measure the level of fuel

in the tank.

Rain Sensor.

Breathalyzer.

Photoelectric Sensor.

Carbon dioxide sensor.

PH glass electrode.

Smoke detector.

More!!!

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