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  Digital Catalogue for Technology and Products Development

   Technology and Product Development

    Basic Information

Technology developed: Optical Fiber Microphone or Hydrophone With And Without Diaphragm. (TP19767473913)
Category: Product (Hardware/Material/Software)
Details of Inventor(s):
Inventor Institution/Organization/Company Department Designation
Rajan Jha and Sumit Dass IIT Bhubaneswar School of Basic Sciences Asst. Prof
Technical Application Area: Military
If 'Other', please specify:
Underwater Acoustics
Please give more details of new technical application area:
The present invention relates to optical fiber-based acoustic signal detection. More specifically, the present invention is directed to develop an optical fiber interferometry based microphoneor hydrophone device for sensing acoustic signal which can operate with and without diaphragm and also work inside and outside water. The present microphone or hydrophone device advantageously includes an all optical fiber design and in-line structure which makes it a practicable and economical contender for acoustic signal detection in different over and under water applications.
Indian Institute of Technology (IIT) Bhubaneswar
Affiliated Ministry: Ministry of Education
Type of technology development: Indigenous
Does the technology help in replacing any import items currently
procured from outside India?
Does the technology have export potential? Yes
Category of Technology developed: Export Potential
Stage of Development: Prototype Level
Please describe in detail including the TRL Level:
A modal interferometer based system to improve performance of vortex flowmeter and a method thereof


Applications: The present invention discloses an optical fiber based acoustic signal sensor or an optical fiber based acoustic signal sensing probe which can be used as microphone or hydrophone. The acoustic signal sensing probe is applicable in both air and underwater and essentially includes an optical fiber means connected between an optical source and an optical detector having optical fibers with tapered regions ensuring travelling of input light from the optical source through said tapered regions and sinusoidal interference in output light to the optical detector due to intermodal interference taking place between core and cladding mode of the optical fiber at the tapered regions. The optical fiber means subjected to the acoustic signal causes a change in the sinusoidal interference spectrum of the output light being detectable by the optical detector for accurate determination of the acoustic signal.
Advantages: Online monitoring, better SNR than commercially avaibale system

    Technology Inputs:

Imported Equipment/Spare Parts:
Equipment/Spare Parts Year ITC-HS Code
Indigenous Equipment/Spare Parts:
Equipment/Spare Parts Year ITC-HS Code
Imported Raw Materials:
Raw Materials Year ITC-HS Code
Indigenous Raw Materials:
Raw Materials Year ITC-HS Code
Existing R&D Facilities used:
Facilities Year ITC-HS Code

    R&D Investment:

R&D investment (Rs. in Lakhs):                    
Indian Source (Rs.) Foreign Source (Rs.) Year
5000000 0 2018-19

   Patents & Publications:

Filed Patents (No.) Granted Patents (No.) Year
0 0 NA
Submitted (No.) Published (No.) Year
0 0 NA

    Commercialization Potential:

Who are the Potential Licensees?
What commercially available products address
the same problem?
Company Product Problem Addressed
Would you like to develop this invention further with
corporate research support?
Would you be interested in participating in cluster based
programs for commercialization research or business
planning for your invention?
      Submitted by: INSTITUTION HEAD Date of Submission: 5-8-2020

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