研究目的
To fabricate a double-notched long-period fiber grating (DNLPFG) sensor with a double-sided surface corrugated periodic grating for CO2 gas sensing applications.
研究成果
The DNLPFG CO2 gas sensor demonstrated high sensitivity in detecting CO2 at room temperature, with a maximum loss variation of up to 3.881 dB and a sensitivity of 0.2146 dB/% when the diameter of the fiber was 32 μm and the CO2 gas concentration was 15%. The sensor's performance was significantly better than previously reported sensors.
研究不足
The study focused on CO2 gas sensing at room temperature and did not explore the sensor's performance under varying environmental conditions or other gases.
1：Experimental Design and Method Selection
The study used a double-sided inductively coupled plasma (ICP) process to nanostructure long-period fiber grating (LPFG) to fabricate a DNLPFG sensor. The sol-gel method was employed to add thymol blue and ZnO to form a gas sensing layer.
2：Sample Selection and Data Sources
Single-mode optical fibers (Corning SMF28e) were used to fabricate the DNLPFG sensor. The fibers were etched to reduce their diameter from 125 to 40, 35, or 32 μm.
3：List of Experimental Equipment and Materials
ICP-etcher, buffer oxide etch (BOE) chemical, metal grating masks, sol-gel composed of organically modified silica (ORMOSIL) doped with thymol blue, ZnO, or a mix of thymol blue with ZnO nanoparticles.
4：Experimental Procedures and Operational Workflow
The fibers were connected into two metal grating masks and an ICP-etcher was used to generate the double-sided surface corrugated periodic grating of the DNLPFG. The DNLPFG was then coated with a sol-gel mixture to form a gas sensing layer.
5：Data Analysis Methods
The transmission loss of light through LPFG was analyzed using a cosine squared function, where the transmission loss was dependent on the coupling coefficients and the length of the grating.
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