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Sampling period criterion in a scanning-beam technique.

C A Schrama¹, E W van der Ham

¹Nederlands Meetinstituut Van Swinden Laboratorium BV, Schoemakerstraat 97, 2628 VK Delft, The Netherlands. cschrama@nmi.nl

|March 18, 2008

Summary

The scanning-beam technique accurately measures detector irradiance responsivity. Errors in this method vanish when the step size exceeds the diffraction limit, aligning theory with experimental results.

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Area of Science:

Optics and Photonics
Metrology and Measurement Science

Background:

The scanning-beam technique is used to measure detector irradiance responsivity.
This method involves integrating spatial responsivity, often approximated by summation with finite step sizes, introducing potential errors.

Purpose of the Study:

To analyze errors in the scanning-beam technique for measuring detector response to irradiance.
To determine the conditions under which these errors vanish and validate theoretical predictions experimentally.

Main Methods:

Theoretical analysis of the scanning-beam technique and its error sources.
Experimental validation of the theoretical findings regarding step size and diffraction limits.

Main Results:

Errors introduced by finite step sizes in the integration process were quantified.
It was demonstrated that these errors diminish to zero when the reciprocal step size surpasses the diffraction limit.
Experimental results showed strong agreement with theoretical predictions.

Conclusions:

The scanning-beam technique can accurately measure irradiance responsivity when step size is optimized.
Reciprocal step size beyond the diffraction limit is crucial for error elimination.
The study confirms the validity of the theoretical model through experimental evidence.