Compares and contrasts the use of dedicated modulation transfer function (MTF) measurement systems and interferometers for testing optical components in the infra-red region of the spectrum
Precision-Optical Engineering (P-OE) has published the latest in its series of on-line interferometry technical datasheets.
IF007, Wavefront Distortion Measurements - MTF vs Interferometry, compares and contrasts the use of dedicated MTF measurement systems and interferometers for testing optical components in the infra-red region of the spectrum.
This new datasheet can be downloaded as a PDF file from the technical library section of the company's website.
The change in shape of a wavefront passing through or being reflected from an optical system, compared to the incident wavefront is an indication of the quality of the optical components.
A quality indicator is the modulation transfer function (MTF) of the image.
The two common methods of measuring MTF in optical components in systems are Fourier transform of measured linespread function, and interferometric measurements.
The datasheet covers experimental arrangements as well as trade-offs in measurement time vs accuracy.
A practical example of the benefits of both techniques in the design of zoom optical telescopes is given.
