| 摘要 |
PURPOSE:To improve measuring accuracy and to simplify the measurement by irradiating laser light of a light emission wavelength in a UV range to a polymer, detecting the fluorescence intensity of part of the scattered light and detecting the gel and the size and number of other foreign matter. CONSTITUTION:For example, an He-cd laser light source 1 having the wavelength in the UV region, a condenser lens 8, a fluorescent filter 9 and a photoelectric multiplier 10 are provided to a grain size meter having a condenser lens 3, a stationary filter 4, a rotary filter 5, a condenser lens 6 and a photoelectric multiplier 7. The laser light of the wavelength (about 440m) of the UV region is irradiated from the light source 1 to a sample 2, then the foreign matter emits fluorescence if said matter is the gel. The presence or absence of such fluorescence is detected by the photoelectric multiplier 10 by which the gel is discriminated from the other foreign matter. The number and grain size of the foreign matter and gel in the polymer are thus easily measured with good accuracy. |
