Development of fiber optic liquid crystal sensor for pressure measurement

Author

Wolinski, Tomasz R. ; Jarmolik, Aleksandra ; Bock, Wojtek J.

Author_Institution

Inst. of Phys., Warsaw Univ. of Technol., Poland

Volume

48

Issue

1

fYear

1999

fDate

2/1/1999 12:00:00 AM

Firstpage

2

Lastpage

6

Abstract

This paper presents a further development of a novel fiber optic low and high hydrostatic pressure sensing technique utilizing new classes of chiral nematic liquid crystals with a significantly reduced thermal sensitivity. The low-pressure sensor (up to 1 MPa) is based on polarization effects caused by strong rotatory power of chiral nematics and pressure-induced deformations of a twisted nematic cell. The high-pressure sensor (up to 60 MPa) is based on intensity phenomena occurring in novel classes of chiral nematics with induced smectic A_d phase. The latest results indicate that our method of hydrostatic pressure measurement offers high response to pressure with reduced temperature sensitivity

Keywords

fibre optic sensors; high-pressure techniques; hydrostatics; liquid crystal devices; nematic liquid crystals; pressure sensors; 1 MPa; 60 MPa; chiral nematic liquid crystals; chiral nematics; fiber optic liquid crystal sensor; high-pressure sensor; hydrostatic pressure measurement; induced smectic A_d phase; intensity phenomena; polarization effe; pressure sensing; pressure-induced deformation; rotatory power; temperature sensitivity; thermal sensitivity; twisted nematic cell; Liquid crystals; Optical coupling; Optical fiber polarization; Optical fiber sensors; Optical fibers; Optical propagation; Optical sensors; Pressure measurement; Sensor phenomena and characterization; Temperature sensors;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.755041

Filename

755041