| 摘要 |
The present invention is directed to an apparatus and method for measuring the haze value of transmissive samples. The apparatus comprises a first light source selectively configurable to emit a first light beam, a second light source selectively configurable to emit a second light beam, an integrating sphere having an outer surface and an inner surface, the inner surface configured to reflect light incident upon the inner surface, the inner surface further enclosing an interior volume. The integrating sphere is further equipped with an exit port configured to emit light from the interior volume of the integrating sphere. The exit port is positioned such that light from the first light source exits the integrating sphere without obstruction, and light from the second light source is diffused on the interior surface of the integrating sphere prior to exiting the exit port. A light detector is also included and is configured to generate a light-intensity signal when light exiting the integrating sphere has passed through a sample and is incident on the light detector. The apparatus further includes a processor configured to receive the light-intensity signal and generate an output signal to a user indicating the haze value. The present invention is also directed to a method of calculating the haze value of a sample using a stored calibration value, a diffuse transmission value (sample-absent diffuse light-intensity value), a direct transmission value (sample-absent direct light-intensity value), a measured diffuse transmission value (sample-present diffuse light-intensity value) and a measured direct transmission value (sample-present direct light-intensity value). |
| 主权项 |
1. An apparatus for measuring the haze value of transmissive samples, the apparatus comprising:
a first light source selectively configurable to emit a first light beam, a second light source selectively configurable to emit a second light beam, an integrating sphere having an outer surface and an inner surface, the inner surface configured to reflect light incident upon the inner surface, the inner surface further enclosing an interior volume, the integrating sphere is equipped with at least one entrance port configured to allow light from one of the light sources to enter the integrating sphere the integrating sphere having an exit port configured to emit light from the interior volume of the integrating sphere, wherein the exit port is positioned such that light from the first light source exits the integrating sphere without obstruction, and light from the second light source is diffused on the interior surface of the integrating sphere prior to exiting the exit port; a light detector configured to generate a signal when light that has left the exit port of the integrating sphere is incident on the light detector, and a processor configured to activate only the first light source and receive the signal generated by the light detector and activate only the second light source and receive the signal generated by the light detector and calculate a haze value based on the signals generated by the light detector such thathaze=(I4I4+k·I6-I3I3+k·I5)×100%; wherein k is a stored calibration coefficient value, I3 corresponds to a first measurement made by the light detector with the second light source activated and a sample located between the exit port and the light detector, I5 is a first measurement value with the first light source activated and a sample located between the exit port and the light detector, I4 is a second measurement value with the second light source activated and no sample is located between the exit port and the light detector, and I6 is a second measurement value with the first light source activated and no sample located between the exit port and the light detector direct transmission value. |
