| 摘要 |
<p>A web of photographic film or the like having an optical property to be inspected and measured (such as exposure density or reflectance) is transported through a flasher chamber at a predetermined nominal speed and is exposed to radiation in the flasher to produce a series of longitudinally spaced, transversely oriented exposure bands separated by unexposed bands on the web. The transport speed of the web through the exposure chamber is selected for a given exposure period for each band such that the web moves only a minor fraction of the longitudinal width of each band during exposure of the band. Subsequent inspection of the web, for example in a densitometer, produces a pulsed output signal waveform in which the peak amplitudes of the pulses are proportional to the optical property being measured independent of any perturbations in transport speed of the web through the exposure chamber.</p> |
