SOLAR RADIATION SENSOR

摘要

PROBLEM TO BE SOLVED: To solve the problem that it is impossible for a conventional solar radiation sensor to accurately obtain a measured value since any internal reflection is generated in a condensing lens according to the elevation angle of the sun. SOLUTION: This solar radiation sensor 1 is provided with an internal reflection preventing part 5 on the back face of a condensing lens 2 formed as a flat face 2c, so that the deviation of elevation angle measurement to be generated when lights reach the flat face 2c according as the sun makes a specific elevation angle, and when the lights fully reflected on the flat face 2c reach a light receiving element 3 can be prevented by the internal reflection preventing part 5.