1：Experimental Design and Method Selection:

The study uses a long-period grating (LPG) coated with single-wall carbon nanotubes (SWCNTs) to create a 'hot wire' anemometer. The LPG is selected for its higher temperature sensitivity compared to fiber Bragg gratings (FBGs). The principle involves heating the SWCNT film with a broadband light source (BBS), which also serves as the probing light, and measuring the wavelength shift in the transmission spectrum due to cooling by air flow.

2：Sample Selection and Data Sources:

An LPG with a grating length of 2.0 cm and period of 550 μm is used. SWCNT films of varying thicknesses (1.0 μm, 1.3 μm, 1.6 μm) are deposited on the LPG. Wind speed data is controlled using a wind tunnel and monitored with a commercial electrical anemometer (TESTO405V1).

3：0 cm and period of 550 μm is used. SWCNT films of varying thicknesses (0 μm, 3 μm, 6 μm) are deposited on the LPG. Wind speed data is controlled using a wind tunnel and monitored with a commercial electrical anemometer (TESTO405V1). List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment includes a broadband light source (BBS), optical spectrum analyzer (OSA, Yokogawa AQ6370), programmable tubular furnace (SK2-1-12, Y-Feng Electrical Furnace Company), thermocouple (KSGD-6.3-16Z, Y-Feng Electrical Furnace Company), wind tunnel, and single-mode fibers. Materials include SWCNTs, APTES (3-aminopropyltriethoxysilane), DMF (N,N-dimethylformamide), and FBG for temperature compensation.

4：3-16Z, Y-Feng Electrical Furnace Company), wind tunnel, and single-mode fibers. Materials include SWCNTs, APTES (3-aminopropyltriethoxysilane), DMF (N,N-dimethylformamide), and FBG for temperature compensation. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: The LPG is silanized with APTES, then immersed in SWCNT-DMF suspension for film deposition. Thickness is controlled by deposition cycles and measured via SEM. The sensor is placed in a wind tunnel; BBS light is input, and transmission spectra are recorded by OSA at different wind speeds and input powers. Temperature response is tested using a furnace.

5：Data Analysis Methods:

Wavelength shifts are analyzed to determine sensitivity. Data is fitted to derive sensitivities, and temperature compensation is applied using an FBG. Statistical analysis includes linear fitting and derivative calculations for sensitivity.