研究目的
To resolve the effects of temperature on the stability of an FFPC sensor for detecting dynamic signals by proposing a simple but effective method of structure compensation based on a thermal expansion model.
研究成果
A temperature-insensitive FFPC sensing probe can be obtained by applying structure compensation in the temperature range of ?20 to 60 °C, with the change of the cavity length controlled to about 6 nm. This method provides a simple approach for practical applications, offering advantages of simple architecture and high reliability.
研究不足
The study is limited to the temperature range of ?20 to 60 °C, which may not cover all practical applications requiring wider temperature ranges.
1：Experimental Design and Method Selection:
The study is based on a thermal expansion model of FFPC probes to achieve temperature insensitivity through structure compensation.
2：Sample Selection and Data Sources:
The FFPC acoustic sensor probes were fabricated with nickel foil as the sensing part and nickel–copper alloy for the shell and core.
3：List of Experimental Equipment and Materials:
Includes a precisely controllable temperature box, electret condenser microphone, oscilloscope, signal generator, and speaker.
4：Experimental Procedures and Operational Workflow:
The probes were tested in a temperature range of ?20 to 60 °C, with interference spectroscopies acquired at each temperature.
5：Data Analysis Methods:
The change of cavity length was determined by the shift of interference spectroscopy, and the thermal stability was evaluated.
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