Abstract: It is analyzed theoretically and investigated experimentally for the vision detection and positioning in an experiment of linear polarization rotatory. Under various conditions, the best method of sensitivity detection is suggested by means of detection sensitivity analysis and verification. Finally, the investigation on difference between the detection positioning and vision using photoelectric technique are carried out and the new method and way of increasing detection sensitivity are pointed out.

Key words: Weber -Fechner＇s law, vision difference, positioning, sensitivity, photoelectric detection