K. A. Unnikrishna Menon currently serves as Visiting Professor at Amrita Center for Wireless Networks and Applications (AmritaWNA). His areas of interest include Electro- Acoustic Sensor Design, Development and Evaluation, SONAR Antenna Design & Field Implementation, Sensor for Under Water Communication, Research and Development in Underwater Transducer Design, Project Management, Techno Mechanical activities.

Qualification: PG in Physics with Electronics as special subject.

Occupation / Post Held: Retd. Scientist-F / Jt.Director (Division-Head "Transducer design and Measurements”, Defence Research & Development Organization (DRDO, Ministry of Defence)
Present Work: Professor, Amrita Center for Wireless Network and Applications, Amrita Viswa Vidyapeetham, Amritapuri, Clappana P.O., Kollam-690525, Kerala.
Experience: Teaching: Seven years at graduate level.

Research: Thirty years experience in the field of development of Underwater Electro- acoustic Transducers for various Sonar Systems of the Indian Navy for induction to ships, submarines and airborne operations. Development of sensors for Tsunami Warning system and Life Recovery System during earthquake.

Details of R&D Work :

  1. Successfully completed the following Projects:
    • Development of underwater transducers for Hull-mounted arrays for ship- sonar
    • Underwater communication system for ships and submarines.
    • Integrated sonar systems for submarines (active and passive)
    • Airborne Dipping Sonar and Ranger buoys
    • Transponders
  2. Technical documentation for projects in the following areas: Transfer of   Technology, Factory Acceptance Tests & Procedures and Qualification Approval Plan.
  3. Characterization of piezo-ceramic materials, ferrite cores and underwater cables.
  4. Techno-managerial area:
    • Division Head - ‘Projectors’:  Active transducer development for various Naval Projects.  
    • Division Head -  ‘Transducer Measurements’:  Measurement support to all projects, technology development and Fleet support.
    • Interaction with production agencies: Transfer of technology for bulk production of subsystems for various projects and training of technical personnel.
  5. Chairman of various Committee/ Boards: a) Tender Procurement Committee b) Assessment Board c) Condemnation Board
  6. Member Review Committee:
    • Authored and  co-authored several technical reports and papers. Guided MTech  students in various projects as a part of the completion of their Projects, review of technical papers, symposia proceedings, organizing / conducting seminars , symposia and lectures.
  7. Project Manager: Successfully completed various prestigious Naval projects as Project Manager  / Project Director. Recognition of the projects by induction to service  of the Indian Navy and by awarding the prestigious DRDO   ‘AGNI’ award.


  1. DRDO Award for project PANCHENDRIYA from Scientific Advisor to Raksha  Mantri  (SA TO RM) – Dr.APJ Abdul Kalam.  – “Induction  of first indigenous state- of- the art sonar to the service”.
  2. DRDO ‘AGNI’ Award for excellence in self reliance from SA to RM - Dr. M .Natarajan – “Design and development of sonar system for fitment on submarines”.
  3. NPOL Golden Jubilee Award for :  
    • Development of state- of- the- art transducer for a Sonar System.
    • Demonstrating Underwater Telephone on Naval Platform                                                         
    • NPOL Award for Field service

Work Area/Technical Expertise:

  1. Transduction mechanism  and concepts
  2. Characterization of piezo-electric materials and passive materials for fabrication of electro-acoustic transducers and their encapsulation.                                                                                                              
  3. Design and fabrication of electro-acoustic transducers for sonic and ultrasonic frequencies capable of working under water.
  4. Equivalent circuit analysis and transduction analogies of mechanical /electrical / acoustic parameters.
  5. Impedance matching requirements of ‘electro-mechanical devices’ for system .    interface.
  6. Vibration modes of different configuration of active materials.
  7. Design and development of pressure and acceleration compensated passive and active transducers for detection of underwater target, obstacle avoidance ,communication etc.
  8. Design of low frequency, high power and compact transducer  like unimorphs/bimorph, sandwich- tonpilz , symbal and flextensional transducers.
  9. Transducer array design for beam control.
  10. Performance evaluation of developed transducers under controlled environmental  conditions and actual field trials.
  11. Parameter measurement using automated measurement system:
    • Receiving sensitivity & projector response
    • Electrical impedance, phase, power handling, source level
    • Receiving / transmitting directivity 
    • Acceleration sensitivity and shock response
  12. In-se-to evaluation of transducers under high pressure and low temperature.
  13. Development of transducers using Piezo-ceramics, Piezo-polymers and Piezo-composites.
  14. Project co-ordination, management and direction
  15. Project documentation, technical publications and training for technology transfer


Publication Type: Patent

Year of Conference Publication Type Title



K. A. Unnikrishna Menon, Jayaram, R., and Divya, P., “Wearable Wireless Tongue Controlled Devices ”, 2018.

Publication Type: Conference Paper

Year of Conference Publication Type Title


Conference Paper

D. Arjun, Indukala, P. K., and K. A. Unnikrishna Menon, “Border surveillance and intruder detection using wireless sensor networks: A brief survey”, in 2017 International Conference on Communication and Signal Processing (ICCSP), Chennai, India, 2018.[Abstract]

Intrusion of terrorists and trespassers are adversely affecting the peace and harmony in the nation. The fatalities and disturbances caused by the latest Uri attack in Indian Army Camp show the necessity of an efficient border surveillance and intruder detection system for the effective monitoring and detecting the unauthorized movement of intruders across the national borders. Conventional border patrolling lacks an integrated multi-sensing system that coordinates various technologies for surveillance and detection of human intruder movement in the different border scenarios: flat surface movement, river/pond crossing and dry leaves movement. This paper describes the current Wireless Sensor Network (WSN) techniques related to intruder detection and border surveillance. Our future work focuses on delivering an improved multi-sensing system for detecting intrusion activities to secure the national borders.

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Publication Type: Conference Proceedings

Year of Conference Publication Type Title


Conference Proceedings

Gayathri B, K., S., and K. A. Unnikrishna Menon, “Non-Invasive Blood Glucose Monitoring using Near Infrared Spectroscopy”, 6th International Conference on Communication & Signal Processing, ICCSP 2017. IEEE, Chennai, India, 2018.[Abstract]

Diabetes has become a grave concern which can affect anyone irrespective of their age. To prevent the uneasiness of invasive glucose monitoring system, it is desirable to develop a low cost non-invasive blood glucose monitoring system. The present work proposes the feasibility of developing such a method for the continuous monitoring of blood glucose concentration using near infrared spectroscopy. Both linear regression and polynomial regression analysis are studied for developing an enhanced algorithm for estimation of glucose concentration using the scattering property of glucose molecules and the principle of photoplethysmography. Processing of data conversion is performed with MSP430G2553 microcontroller in the integrated development environment (IDE) of Code Composer Studio (CCS). Data analysis is carried out in MATLAB from which a relation between blood glucose concentration and photoplethysmograph is derived.

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