What device is used to evaluate the quantitative values for the emitted light of fluorescent materials?

The correct answer is the fluorometer, which is specifically designed to measure the intensity of fluorescent light emitted by a sample when it is excited by a certain wavelength of light. In the context of Liquid Penetrant Testing, the fluorometer plays a crucial role in quantifying the amounts of fluorescent penetrants present after the test, allowing for a more objective assessment of indications.

The fluorometer works by detecting the emitted light at different wavelengths and providing quantitative data, which is essential for determining the effectiveness of the penetrant and the characteristics of the discontinuities detected. This capability ensures higher accuracy in evaluations and is vital for maintaining the integrity and reliability of testing processes.

Other devices mentioned, such as the spectrometer, are generally used for analyzing the spectral composition of light and may not focus solely on the emissions from fluorescent materials. The refractometer measures the refractive index of liquids and is unrelated to fluorescence. Thus, the fluorometer is uniquely suited for evaluating fluorescent materials, making it the correct choice in this scenario.