08-10-2011, 08:47 AM
Ooops,
The current Imatest target is reflective while encoders base is transluctive.
Target has dark and white areas.The targhet is with high contrast. While most optical encoders are transluctive – metal grid over glas or trans[perant plastic.
Back illuminating is not an option. Since another side effects will occures – scattering, refraction etc. The encoder manufactures do a lot of trics to acheve resonacble sharp images. remember the encoder head is looking for 0 and 1 while we must look for nuaces of light
SinCos encoder is exection of 0s rule, but high end manufacures guaranties 1% THD by perfectly aligned encoder
The current Imatest target is reflective while encoders base is transluctive.
Target has dark and white areas.The targhet is with high contrast. While most optical encoders are transluctive – metal grid over glas or trans[perant plastic.
Back illuminating is not an option. Since another side effects will occures – scattering, refraction etc. The encoder manufactures do a lot of trics to acheve resonacble sharp images. remember the encoder head is looking for 0 and 1 while we must look for nuaces of light
SinCos encoder is exection of 0s rule, but high end manufacures guaranties 1% THD by perfectly aligned encoder