Opto-mechanical door locking system

Saurabh S. Patil, Vanessa M. Rodrigues, Ajeetkumar Patil, Santhosh Chidangil

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We present an Opto-mechanical Door Locking System which is an optical system that combines a simple combination of a coherent light source (Laser) and a photodiode based sensor with focus toward security applications. The basic construct of the KEY comprises a Laser source in a cylindrical enclosure that slides perfectly into the LOCK. The Laser is pulsed at a fixed encrypted frequency unique to that locking system. Transistor-transistor logic (TTL) circuitry is used to achieve encryption. The casing of the key is designed in such a way that it will power the pulsing laser only when the key is inserted in the slot provided for it. The Lock includes a photo-sensor that will convert the detected light intensity to a corresponding electrical signal by decrypting the frequency. The lock also consists of a circuit with a feedback system that will carry the digital information regarding the encryption frequency code. The information received from the sensor is matched with the stored code; if found a perfect match, a signal will be sent to the servo to unlock the mechanical lock or to carry out any other operation. This technique can be incorporated in security systems for residences and safe houses, and can easily replace all conventional locks which formerly used fixed patterns to unlock. The major advantage of this proposed optomechanical system over conventional ones is that it no longer relies on a solid/imprinted pattern to perform its task and hence makes it almost impossible to tamper with.

Original languageEnglish
Title of host publicationOptical Systems Design 2015
Subtitle of host publicationOptical Design and Engineering VI
ISBN (Electronic)9781628418156
Publication statusPublished - 01-01-2015
EventOptical Systems Design 2015: Optical Design and Engineering VI - Jena, Germany
Duration: 07-09-201510-09-2015


ConferenceOptical Systems Design 2015: Optical Design and Engineering VI

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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