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    Basic Information

Technology developed: Optical Fiber Solid Core Photonic Crystal Fiber Modal Interferometer Based Micro-G Accelerometer (TP19767364213)
Category: Technology Service/Know how
Details of Inventor(s):
Inventor Institution/Organization/Company Department Designation
Rajan Jha IIT Bhubaneswar School of Basic Sciences Asst. Prof
Technical Application Area: Space
If 'Other', please specify:
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 microphone or 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 The present invention relates to acceleration measurement. More specifically the present invention is directed to develop a simple and compact optical fiber modal interferometer based accelerometer capable of measuring acceleration with a micro-g resolution.
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 The present device is a simple and compact modal interferometer based optical fiber accelerometer consisting a simple cantilever-mass structure. To detect acceleration in micro-g range we need a displacement sensor which can detect displacement in nanometer or sub-nanometer range. To achieve the purpose of detecting this minuscule displacement we have proposed a SCPCF based model interferometer which can detect nanometer displacement. The accelerometer geometry comprises a stainless steel cantilever mounted on a fixed aluminum block and an inert mass is attached at the tip of the cantilever. The upper surface of the inert mass is gold coated in order to act as a mirror surface. Just above the gold coated surface at an optimized vertical distance of 110, there is a ferrule securing the Single Mode Fiber (SMF)-Solid Core Photonic Crystal Fiber (SCPCF) spliced section. The vertical displacement of cantilever tip is proportional to the acceleration and hence it can be exploited for detection of acceleration.


Applications: Space Technology
Advantages: (i) Immune from electromagnetic waves; (ii) Small and very portable design; (iii) High resolution; (iv) Low cross axis sensitivity (v) Minimum hysteresis (vi) Possibility of multiplexing.

    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
1000000 0 2016-17

   Patents & Publications:

Filed Patents (No.) Granted Patents (No.) Year
2147483647 0 2016-17
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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