well if he beam should "fly away" like that then why doesen't the beab fly away in sharp Ir sensors? they get accurate readings even if the object is angeled 100degrees and tilted upwards... it uses IR beams also, doesen't it?
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well, i wouldn't call it accurate. in fact it's accuracy (Sharp sensor) is quite poor (i do have few of them).
you just have to evaluate from case to case if the sensor is satisfactory for the application. decent sensors are often very expencive but the output is not affected by temeprature, color of the target etc and they will have linear output and visible red beam for easy alignment. however the price tag of $1000-1300 per sensor will make you think twice before placing purchase order :-)
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