Study on a novel illuminance calibration method for signal to noise ratio measurement of image intensifier
2010
Signal to noise ratio is a fundamental performance of a image intensifier, which shows the photons
detection ability from object in low light level, and its determine detection range and image definition.
The input illuminated circular area must be 0.2mm in diameter on the photocathode, input illuminance
must be 1.02×10 -4 lx in signal to noise ratio value measurement of Image intensifier . So the paper study
a novel illuminance calibration method, which uses PMT photon counting detection technique. The
method can directly calibrate illuminance value of very low light sources in signal to noise ratio
measurement device of image intensifier. First, we introduce the principle of low light image intensifier
S/N tester. Secondly we research illuminance calibration method of 0.2mm in diameter on the
photocathode of image intensifier, design quasi-point low light luminometer, which adopts the photon
counting detection technique. So we research the radiation characteristic of standard light source with
2856K color temperature and calculate its output photon number, For high accuracy measurement on
quasi-point sources, vision function correction and cosine correction is made. Lastly, we research the
traceability diagram of this luminometer, which is traceable to our primary photometry metrology
standard device. The experimental results indicate the novel illuminance calibration method can
accurately directly measure illuminance of quasi-point sources. Comparing with the conventional
calibration method this novel method avoids the transfer error. The absolute illuminance calibration
uncertainty is analyzed. These analysis results are useful as a evaluating method for improving signal
to noise ratio of Image intensifier.
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