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Correction method for effects of stray light - uses light- sensitive resistance and modulated light
Correction method for effects of stray light - uses light- sensitive resistance and modulated light
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机译:杂散光影响的校正方法-使用光敏电阻和调制光
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摘要
Two resistances (R - Delta R, r) in series are used between a defined voltage source (V), one of them (R - DeltaR r) being a photo resistor subjected to the illumination of the ambient light (E) and a modulated light beam (Delta E): the variation of voltage (v) corresponding to this modulation being bled off at the terminals of the resistance which does not receive the modulated light beam. The mean values of resistivity of the two resistances are maintained equal. The potential at the point (M) between the two resistances is compared with one half of the supply voltage and the difference is used to modify the value of at least one of the resistances in order to annul the difference; the modification thus eliminates the effects of the variation caused by modulating the light beam.
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