PEN fluorescent birefringence sensor in ethanol volatilization measurement

Through the fluorescence characteristics of polyethylene naphthalate (PEN) material under short-wavelength excitation, a boradband light source of visible wavelengths can be generated. By combining this with the white-light source, we propose the design of a simple birefringent PEN sensor, utilized in a white-light polarization interferometer for the dynamic measurement of ethanol volatilization. Based on these experimental observations, the application of detecting variations in liquid refractive index can be validated.