Metrology System to Beam Combining Facility ICD INT-406-VEN-0012 v0.4.doc Page 5 of 16
9 Requirements
9.1 Metrology Table
9.1.1 Metrology table area and location
A metrology table area of 7.2m minimum by 0.6m minimum is required to support the optical layout for 10
delay lines fed by up to two laser heads. It may comprise several tables but must behave as one monolithic
table.
Access is required to the front (closest to the delay lines) and rear of the table for adjustment of various
optical components and the shear camera. This places a maximum practical width on the optical table of
1.8m.
The distance between the end-plate of each delay line and the nearest edge of the metrology table
should not be less than 0.75m. This allows sufficient space for the protection mechanism of the DL
science beam exit window to project a further 250mm in front of the end-plate (the surface of which
is 100mm from the inside wall of the BCA) thus allowing at least 500mm clear for personnel access
to the delay lines or the metrology table.
The laser head is to be mounted at the south end of the table but provision should be made for
mounting a second laser at the N end of the table if room permits. At least 850mm between the end
of the table and the centreline of the nearest delay line is required to accommodate the laser head
and branch mirrors.
The metrology table should be positioned at least 600mm from the south wall of the BCA to allow personnel
access.
9.1.2 Metrology table height
The height of the table is determined by the height of the metrology beam expander assembly and the
incoming science beam height above the BCA floor. The nominal height of the centre of the incoming
science beam above the BCA floor is 1.6m. The base of the metrology system is 355mm below this and
therefore the nominal height of the top surface of the metrology table is 1265mm above the floor with an
allowance of +/-0.25mm for height setting and +/-0.1mm in the table surface error. Adjustment of the height
of the metrology table (with a sensitivity of approximately 0.1mm) must be provided as there is no height
adjustment in the individual metrology beam expander assemblies.
9.2 Electronics
Rack space in the outer BCA is required for a single 12U height VME crate is required for the metrology
measurement system. The parts required for the VME system are listed in RD4 but a portion of the table is
reproduced here in Table 1. In addition to the VME power supply at least 13 slots will be required depending
on the disc drive and any other peripheral devices/interfaces.
Rack space in the outer BCA is required to hold the power supply block for the laser head. The Agilent laser
has a power block rather than a rack-mountable module and a second block or 15V PSU will be needed when
more receivers are powered. Space is also require to hold up to 10 Agilent receiver modules which receive
signal from the remote sensors over optical fibre and convert it to voltages which are then connected to the
measurement board. A 3U height unit should be sufficient to house these modules and the power supplies.
Rack space of 15U for up to 10 1U height shear camera computer modules with a 0.5U minimum spacing
between each is required. They need not occupy the same rack as the VME system nor all be contained in
one rack.
The positioning of the rack(s) in the outer BCA used for housing the electronics should take into account the
available cable tray routes and the maximum cable lengths detailed in the following section. The preferred
location of all the electronics is in a single rack located in the outer BCA close to the south end of the
metrology table as shown in Figure 1 in the appendix.
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