Introduction
Ultrasonic Application
When using mounting tape to mount wafers, there is no indication on the tape
length at the machine. In order to measure the length of the tape, we use a
Ultrasonic sensor with resolution of less then to provide high accuracy of
measurement.
The user only need to submit initial length of tape, tape thickness and to set an
empty roll with only push of a button.
The Ultrasonic sensor is built with sender and receiver. It is counting pulses from the
moment that the ultrasonic wave was sent until the moment when the reflected
ultrasonic wave is back from an object to the sensor. With an easy calibration
process (factory setting by ADT) we can convert the pulses to current tape left
length, by a formula that developed by ADT.
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