What is fiber optic temperature sensor in biomedical instrumentation

The basic theoretical basis of fluorescence measurement method is that when the intensity of the fluorescence linear spectrum shows monotonicity with temperature, and the temperature of the fluorescent substance determines the time of the light quenching process, fluorescence temperature measurement can be carried out. Therefore, it is generally divided into fluorescence intensity temperature measurement method, fluorescence lifetime temperature measurement method, and laser induced fluorescence method. Among them, the fluorescence lifetime temperature measurement method is not easily affected by the intensity of the excitation light source, coupling degree, and fiber transmission efficiency in the temperature measurement process, and has more obvious advantages in use.

Principle of fiber optic temperature measurement:

After removing the excitation light source, the duration of fluorescence emission by the fluorescent substance is called fluorescence lifetime, which depends on the lifetime of the excited state. The fluorescence lifetime of fluorescent substances is related to the corresponding temperature within a certain temperature range.

The application of fiber optic sensors in the medical field has become relatively mature, commonly including fiber optic volumetric pressure sensors, fiber optic oxygen meters, fiber optic blood flow meters, and fiber optic endoscopic technology. The liquid crystal fiber optic temperature sensor is an early developed fiber optic temperature probe, with a temperature range of (35-50) ℃ and a measurement accuracy of up to 0 1 ℃. At present, the diameter of fiber optic temperature sensors such as new intensity modulation and wavelength modulation fiber optic temperature sensors is smaller than that of general thermometers, and can be used for invasive human body temperature measurement and monitoring.

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