The talbot plane or talbot distance is based on the pitch of the scale and the wavelength of the incident light. The exact equation is as follows:
Talbot Distance = 2 / (Wavelength of incident light x Pitch^2)
Therefore, if you want to increase the number of lines on the scale, the pitch decreases – which means the talbot distance decreases and makes alignment of the readhead more difficult.
Click for more information on talbot imaging in high resolution optical encoders.
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