1：Experimental Design and Method Selection:

The sensor was designed using an FBG encapsulated in a stainless steel capillary to isolate pressure and enable rapid temperature response. Theoretical models for temperature sensitivity and transient heat transfer were employed.

2：Sample Selection and Data Sources:

The FBG sensor was tested in controlled environments, including water baths and pressure chambers, to measure temperature and pressure responses.

3：List of Experimental Equipment and Materials:

Equipment includes a Smartscan demodulator, electronic thermometer, oven, thermoelectric cooler (TEC), test tube for pressure testing, and glass rod. Materials include the FBG sensor, stainless steel capillary, and water.

4：Experimental Procedures and Operational Workflow:

Temperature response was tested by placing the sensor in a water bath heated in an oven, recording wavelength changes. Response time was measured by transferring the sensor from room temperature to hot water and recording temperature changes. Pressure resistance was tested by applying pressure up to 100 MPa and monitoring wavelength stability. Temperature resolution was tested using a TEC.

5：Data Analysis Methods:

Data were analyzed using linear regression for temperature sensitivity, finite element modeling for response time, and statistical methods for resolution and pressure effects.