| 摘要 |
PURPOSE:To eliminate an error due to the shadow of a car and the error due to traction of a trailer, by fitting a photodetector, to which a light shield hood is fitted, in the front part and the rear part of the car respectively and by measuring the overall light quantity divisionally by two photodetectors. CONSTITUTION:Outputs of photodetectors 4 and 5 which have the light shield hood and are fitted to the front part and the rear part of the car respectively are given to recorders 8 and 9 through operational amplifiers 6 and 7 and are recorded. Pulse generator 10 gives pulses to recorders 8 and 9 for the purpose of correcting the difference of the measure time due to the difference of the fitting positions between photodetectors 4 and 5. Recorded values of recorders 8 and 9 are added by adder 11 and are displayed on display equipment 12, thereby obtaining the illumination intensity. |
