Lambda SRS SR475, Руководство по эксплуатации

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1.1 Introduction to the Instrument 1 – 3
active servo system instead of a solenoid and return spring, the SR475
and SR476 do not have a preferred state, and can stay indefinitely in
either state without significant power dissipation. Significant power
is only used when opening or closing, and each shutter head is rated
for continuous duty without duty cycle restrictions.
The shutter blade in an SR475 or SR476 is mounted in a sapphire
jewel bearing to minimize friction, and is driven as a part of a tightly
integrated rotary motor. The motor design, along with the impulse
reduction from eliminating physical stops, results in a head lifetime
that is orders of magnitude more than is typically found in other
laser shutter systems.
The on-board electronics in the shutter head detect the blade position,
servo control the blade position, and provide control, communica-
tion, and error detection functions. Electrical, over-temperature, and
mechanical faults are detected and can be reported over the shutter
head’s serial interface.
1.1.3 Mechanical performance
Figure 1.1: Mechanical action of the SR475 and SR476 shutter heads.
Part (a) illustrates the shutter head in the
closed position, where the
shutter blade blocks the aperture. Part (b) shows the shutter head in
the
open position, where the shutter blade is clear of the aperture.
The location of the shutter blade in its open and closed positions is
illustrated in Fig. 1.1. In the open position the shutter blade is clear of
SR475 and SR476 Laser Shutters