Abstract
An optical fiber Bragg grating (FBG) sensor is capable of simultaneous measurement of sound pressure and temperature. The FBG is a type of refractive index grating constructed in a short segment of optical single mode fiber that reflects particular wavelengths of light. This Bragg wavelength depends on both of the sound pressure and the temperature. We reported the simultaneous measurement of sound pressure and temperature in water under the conditions of medical application. In this study, temperature rise of a tissue mimicking material (TMM) caused by exposure to ultrasound in the range of 0.3 to 5 MPa were measured. The TMM is made of agar-gel with Glycerin solution of 11.21%. The FBG of 1 mm in length constructed in the optical fiber of 0.25 mm in diameter was used in the experiments. As a result, as the measured sound pressure was 5 MPa, the measured temperature rise was 6.0 degree. Thus this sensor is capable of simultaneous measurement of sound pressure and temperature rise of biological tissues exposed to the ultrasound. [This study was supported by MEXT-Supported Program for the Strategic Research Foundation at Private Universities, 2013–2017.]
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