Photoelectric Transducer : Working and Applications

The Photoelectric Transducer that changes the rays, light into electrical energy. As a light energy drops over the exterior of metal, the energy can be changed into KE (kinetic energy) of the electron & the electron lefts the metal. This is mainly lying on the charge ‘e’ and work function ‘φ’ of the material. The emission of electrons mainly depends on the strength of light which falls on the exterior. This kind of transducer is mainly designed for measuring diameter as well as length differences within arterial sections within elastic & vitro tubes.

The construction of this transducer is so easy, its non-linearity is very small & its sensitivity ample. The transducer’s cut-off frequency can be 300 Hz & its tiny phase lag will change the linearly through frequency. This article discusses an overview of the photoelectric transducer, working principle, and its applications.

What is Photoelectric Transducer?

The photoelectric transducer can be defined as, a transducer which changes the energy from the light to electrical. It can be designed with the semiconductor material. This transducer utilizes an element like photosensitive which can be used for ejecting the electrons as the light beam soak ups through it. The electron discharges can change the photosensitive element’s property. Therefore the flowing current stimulates within the devices. The flow of the current’s magnitude can be equivalent to the whole light absorbed with the photosensitive element.

The diagram of the photoelectric transducer is shown below. This transducer soak ups the light radiation which drops over the semiconductor material. The light absorption can boost the electrons in the material, & therefore the electrons begin to move. The electron mobility can generate three effects like

  • The material resistance will be changed.
  • The semiconductor’s o/p current will be changed.
  • The semiconductor’s o/p voltage will be changed.

Photoelectric Transducer Classification

These transducers are classified into five types which include the following

Working Principle

The working principle of Photoelectric Transducer can be classified like photoemissive, photovoltaic otherwise photoconductive. In photoemissive type devices, once the radiation drops over a cathode can cause emission of electrons from the cathode plane.


The output of the PV cells can generate a voltage which is relative to the intensity of radiation. The occurrence of radiation can be IR (infrared), UV (ultraviolet), X-rays, gamma rays, and visible light. In photo-conductive devices, the material’s resistance can be changed once it is light up.

Applications of Photoelectric Transducer

The applications of this transducer mainly include the following.

  • These transducers are used in biomedical applications
  • Pickups of pulse
  • Pneumograph respiration
  • Measure blood pulsatile volume changes
  • Records Body movements.

Thus, this is all about Photoelectric Transducer which is main measuring devices. These transducers respond on electromagnetic radiation, dropping on the changing element’s surface.

A light can be noticeable & also have a less or large wave-length can be unseen. From the basic types of transducers, two from them are formally categorized like semiconductor devices which include photoelectric & photo semiconductor. Here is a question for you, what are the advantages and disadvantages of Photoelectric Transducer?