Abstract:

The atmospheric horizontal visibility is one of the important parameters in some realms such as transportation. A method of one-terminal transmission visibility meter by using corner reflector is proposed based on the principle of transmission visibility measurement. The system is easy to be adjusted and calibrated due to combination of transmitter and receiver. With the laser light going and back, the length of horizontal atmosphere volume is doubled, so the visibility measurement range is extended. By means of phase locking amplifying, signal noise has been effectively suppressed and the accuracy of visibility measurement is improved. The result of the experiments shows that correlation coefficient between measured value and actual value is up to 99.93%. Finally, the results of visibility measurement are given. Reaserches indicate that correlation coefficient R between our system and foreign instrument is 0.9904.

Key words: visibility, one-terminal transmission, corner reflector, phase-locked amplifier, control of single-chip computer, comparison