Optical testing device with light intensity change detecting function

Abstract

An optical testing device has a beam splitting element, a glowing unit, a first sensor, and a second sensor. The beam splitting element has a first side and a second side. The glowing unit and the second sensor are disposed at the second side. The first sensor is disposed at the first side. The beam splitting element is capable of splitting the beam emitted from the glowing unit into a testing beam and a reflection beam. The testing beam penetrates the beam splitting element and is received by the first sensor. The reflection beam is reflected by the beam splitting element and is received by the second sensor. Therefore, the change of light intensity of the light source can be monitored, and thus the processing unit is allowed to correct the calculations on the basis of the change of light intensity of the light source.

Dependencies are inferred from the claim text.