Journal of Opto-Electro-Medic Science

Impact of gamma irradiation on the properties of fiber Bragg grating: A review

2025-02-08T14:11:00+07:00

Fiber Bragg grating (FBG) is an optical sensor used to detect environmental changes, such as temperature, pressure, and radiation. This study analyzes the impact of gamma-ray irradiation on the shift of Bragg reflection wavelength in FBG optical fibers at various temperatures. The results show that increasing temperature from 18°C to 40°C before gamma irradiation causes a Bragg wavelength shift of about 5.48 pm/°C. Gamma-ray irradiation with a cumulative dose of 22.85 kGy for 124 min at 35°C resulted in a radiation dose-dependent Bragg wavelength shift, with a value of about 5.25 × 10-3 pm/Gy. After the irradiation was stopped, the Bragg reflection wavelengths on the FBG fibers showed a recovery of up to 84.4% for the buffer fiber and 36.2% for the reference fiber. These findings provide important insights into the behavior of FBG sensors in an environment of gamma radiation and temperature fluctuations, making them potential for applications in extreme condition monitoring.

Factors contributing to slice loss in small-angle X-ray scattering tensor tomography in real space: A review

2025-06-19T16:21:01+07:00

X-ray small-angle scattering tensor tomography (SAXSTT) technique is an innovative method that enables 3D tomographic reconstruction of large-volume voxels non-destructively. This study identifies factors that affect slice loss in SAXSTT in real space. Results show that the quality and resolution of the resulting images are strongly influenced by the signal to noise ratio, absorption, as well as scattering in the sample. In addition, parameters such as collimator and slice thickness during CT scanning prove crucial for obtaining optimal image results. Reconstruction using SAXSTT shows great potential in high-precision material analysis, especially in applications where sample integrity is required to be maintained.

Development of fiber Bragg grating as a sensor based on Mach-Zehnder interferometer and development of optical fiber instruments: A review

2025-06-30T14:31:02+07:00

Over the past few decades optical sensor has experienced significant development. The utilization of fiber Bragg grating for the detection of various parameter such as stress, strain, displacement, temperature, refractive index, humidity, pressure and vibration by measuring the changes in wavelength, polarization, intensity of light passing through the sensing region and phase. This review discusses the development of optical sensors using the Mach-Zehnder interferometer which is being frequently used for sensing applications due to their geometric and flexible construction. This review would be useful for the researchers to develop miniaturize fiber devices and instrument with enhanced sensing performance.