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I have a similar need as the one posted by Ludovic
DEMEULENAERE yesterday for crane positioning, but for a short distance application in an extrusion machine. I need to measure the position of a moving carriage with a 1.5 meter travel; the position sensor's most viable mounting position is about 30 cm from the carriage at rest or zero position (therefore, 1.8 m from the carriage when fully extended).
I have been looking at several options, from cable or reel type position sensors/string pots (like Unimeasure) to ultrasonic analog output sensors to laser type devices (like Sick). The most cost effective solution we've seen so far is the cable or string pot, at about $500. However, a non-contact method is much more desirable in this app. Does anybody know of a non-contact (laser or LED or ultrasonic) device with analog output in that same price range? All laser options investigated so far are too expensive (and overfeatured) for our needs. We have no limitations on fixing any required type of
reflective surface to the carriage, so that is not a problem. Also, resolution/accuracy is not very critical(up to 5mm or so could be ok). Any
suggestions welcome.
We haven't looked much into ultrasonic sensors,
because since they have a much wider "aperture" or
"window" than lasers, we suspect that we may have
problems with them, since the line of sight from the sensor to the carriage in its furthest position is pretty narrow (possibly a square foot), as it runs inside a metal cage. However, we are ignorant in this matter, and any feedback will be welcome.
Thanks and best regards, Bob.
DEMEULENAERE yesterday for crane positioning, but for a short distance application in an extrusion machine. I need to measure the position of a moving carriage with a 1.5 meter travel; the position sensor's most viable mounting position is about 30 cm from the carriage at rest or zero position (therefore, 1.8 m from the carriage when fully extended).
I have been looking at several options, from cable or reel type position sensors/string pots (like Unimeasure) to ultrasonic analog output sensors to laser type devices (like Sick). The most cost effective solution we've seen so far is the cable or string pot, at about $500. However, a non-contact method is much more desirable in this app. Does anybody know of a non-contact (laser or LED or ultrasonic) device with analog output in that same price range? All laser options investigated so far are too expensive (and overfeatured) for our needs. We have no limitations on fixing any required type of
reflective surface to the carriage, so that is not a problem. Also, resolution/accuracy is not very critical(up to 5mm or so could be ok). Any
suggestions welcome.
We haven't looked much into ultrasonic sensors,
because since they have a much wider "aperture" or
"window" than lasers, we suspect that we may have
problems with them, since the line of sight from the sensor to the carriage in its furthest position is pretty narrow (possibly a square foot), as it runs inside a metal cage. However, we are ignorant in this matter, and any feedback will be welcome.
Thanks and best regards, Bob.