INTRODUCTION TO OPTICAL SENSOR

What is the basic configuration of an optical sensing system?

• Light emitter, light receiver, and modulation system
  

• Light emitter, light receiver, and medium
  

• Light detector, light source, and power supply
  

• Light modulator, medium, and receiver

What property of light does an optical sensor primarily measure to detect changes in the environment?

• a) Frequency
  

• b) Wavelength
  

• c) Intensity
  

• d) Polarization

What is the primary function of a light receiver in an optical sensing system?

• a) To generate light
  

• b) To modulate the light signal
  

• c) To detect and convert light into an electrical signal
  

• d) To amplify the light intensity

What is an optical sensor?

• a) A device that detects and responds to electrical signals
  

• b) A device that detects and responds to light signals
  

• c) A device that measures temperature
  

• d) A device that monitors sound levels

Which of the following is a common type of light emitter used in optical sensors?

• a) Thermocouple
  

• b) LED (light-emitting diode)
  

• c) Capacitor
  

• d) Resistor

What is the primary role of a light receiver in an optical sensor system?

• a) To emit light
  

• b) To amplify electrical signals
  

• c) To detect incoming light and convert it into an electrical signal
  

• d) To measure temperature

Which optical sensor detects light levels and is often used in streetlights to turn them on and off?

• a) Phototransistor
  

• b) Photoresistor
  

• c) Laser diode
  

• d) CCD camera

• What is the purpose of using a lens in an optical sensor system?
  

• • a) To generate electrical power
    

• • b) To focus or disperse light for better detection
    

• • c) To increase the temperature of the light source
    

• • d) To convert light into sound

What type of optical sensor is commonly used in cameras to capture images?

• a) Photoresistor
  

• b) Photodiode
  

• c) CCD camera
  

• d) LED

What kind of output signal do most optical sensors produce?

• a) Analog signal
  

• b) Digital signal
  

• c) Both analog and digital signals
  

• d) None of the above