Sensor are artificial device that helps to detects event In it’s environment and send the information ascertained to other electronics.

Sensors can also be known as electric eye and they  are used in everyday objects such as a light or as complex as a computer, touch sensitive elevator buttons and lamp which dim and brighten by touching the base, besides innumerable applications of which most people are never aware.

Uses of electric eye

  1. To expand traditional fields temperature
  2. Pressure or flow measurement (he MARG sensor)
  3. It can be used in airplane.
  4. Aerospace
  5. Car
  6. Medicine
  7. Robotics and many other aspects of our day to day life.


electric eye are designed to have a small effect on what is measured, thereby making the sensor smaller.

electric eye are sophisticated devices that can converts the physical parameters such as temperature, blood pressure, humidity, speed into signal which can be measured electrically and also frequently used to detect and respond to electrical signal or optical signal.


There are features or certain criteria which have to be considered when choosing a sensor.

Environment (environmental condition can limits the pressure and temperature)
Range(you need to ensure that the range or measurement limit of sensor is accurate).
Calibration: calibration is very essential for most of the measuring devices in other to get an accurate range.
Resolution : it’s the smallest increment that the sensor can detect.
Cost: it’s very necessary to know the cost of the material you are using.
Repeatability : how your read varies or repeated due to the environmental factors.


There are classified into many criteria which are as follows :
Transduction principle
Primary input quantity
Material and technology

Transduction principle is the foundation criteria which followed an efficient approach.
Material and technology criteria are been chosen by the developers (the engineer).

Property :classification based on properties are as follows

  1. Temperature
  2. Pressure
  3. Flow
  4. Level sensor
  5. Proximity and displacement
  6. Biosensors
  7. Image
  8. Gas and chemical
  9. Acceleration.

Classification based on application

industrial process control
Measurement and automation
Non-industrial ( aircraft, medical products, automobiles and consumer electronics etc.)

Classification based on power or energy supply requirement of the sensors

Passive (it those not require power supply e.g. Radiometer and film photography)
Active (it requires power supply e.g. Light detection and ranging).

Classification based on current and future application

Accelerometer (based on the micro electro mechanical sensor tech).
Biosensors (based on electrochemical tech. Which is used for food testing, medical care device and water testing etc.).
Image sensor (based on the Cmos tech. Which can be find in PC imaging, traffic and consumer electronics).
Motion detector (based on the infra red microwave ultrasonic and radar tech. Which is used for video games).

Types of electric eye

  1. Temperature
  2. Uv
  3. Touch
  4. Piezoelectric
  5. Gas detector
  6. Oxygen
  7. Current
  8. Smoke
  9. Torque
  10. Photoelectric
  11. Flame detector.

Temperature sensor is the type of sensor that collect information about temperature and convert it into other form that will be suitable for devices and human.
Temperature sensor are of two types contact and non contact temperature sensor.
Contact temperature sensor is a type of temperature sensor that requires direct physical contact with the object that is being sensed. And their work is to supervise the temperature of liquids, solids and gases over a wide range.
Non-contact temperature sensor it those not require direct physical contact with the object that is being sensed. Their supervise non-reflective liquid and Solid.

UV electric eye

Uv sensor comes in form of polycrystalline diamond, electromagnetic radiation that helps to measure the intensity or power of the incident ultraviolet radiation.
Criteria to select a Uv sensor
Power Range
Operating temperature.

How it works

The Uv electric eye accept one type of energy signal and transmits different types of energy signals
It observe and record the output signal eg. Light sensor, ultraviolet light detectors, Germicidal Uv detector, photo stability sensor.

Application of Uv electric eye

Printing industry and chemical industry.

Touch electric eye

Touch sensor work Like or act like a variable resistor and it is made of insulated spacing material such as foam or plastic, fully conductive substance such as copper and partially conductive material.

How it works

It opposes the flow of current for the partially conductive
It varies the resistance of the material.

Applications of touch electric eye

Commercial (vending fitness and gaming and medical).
Transportation (streamlining control and cockpit fabrication).
Appliances (washing machine /dryers, oven and refrigerator.
Fluid level sensors
Industrial automation
Consumer electronics.

Torque electric eye

Torque electric eye can also be called torque transducer or torque meter used for measuring and recording the torque on a rotatory system such as crank shaft, gearbox, an engine and rotor etc.

Pressure sensor is a type of electric eye used for measuring gases or liquids.

Photo electric 
Photo electric sensor also know as photo eye is an equipment or device used to discover the distance observe or Pressure of an object by using a tight transmitter, often infrared and a photoelectric receiver.

Gas detector 
A gas detector sensor is a device that detect the presence of gases in an area, often as part of a safety system.

Piezoelectric sensor is a device that uses the piezoelectric effect to measure changes in pressure, temperature acceleration and force by converting them to an electrical charge.

Smoke Detector 
Smoke Detector Is a device that senses smoke such as an indicator or fire.


sensor are devices or organ that detects certain external stimuli which can be used as a security in our homes and offices .

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