envea STACK 602, Руководство пользователя

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STACK 602 Appendix A – Alignment
ENVEA UK Ltd
(PC-000848-MA Issue 5, December 2021)
57
Appendix A – Alignment
Principles of Alignment
Transmitter (Tx)
The STACK 602 has a diffused transmitter, which emits light at various angles (see
Figure 26
). The highest light intensity occurs in the forward direction.
Therefore, if the Transmitter is misaligned (for example, the Transmitter is not
pointing directly at the Receiver), the light level at the Receiver will be reduced.
Figure 26: Alignment principles – Transmitter.
Receiver (Rx)
The STACK 602 Receiver consists of a lens that focuses the received light onto a
small Receiver diode (see
Figure 27
below).
The Receiver must be aligned correctly, so the lens focuses light onto the centre
of the Receiver diode. If the Receiver becomes misaligned, the beam may miss
the Receiver diode completely. Therefore, correct Receiver alignment is
critical for
the instrument to function.