Metrology System to Beam Combining Facility ICD INT-406-VEN-0012 v0.4.doc Page 7 of 16
9.4 Services
The following services are required for the metrology system:
• Utility power for the VME rack
• Utility power for up to ten shear camera computers each fitted with 180W power supply.
• Utility power for the Laser head and receiver module power supplies 200W
• One network socket at the metrology table. (Gigabit Ethernet recommended for displaying shear camera
images)
• Ten network sockets for the shear camera computers. (Gigabit Ethernet recommended)
• Ducting/cable trays for connections between metrology table and equipment rack(s)
9.5 Thermal loading
The laser will dissipate 35W while warming up but approximately 23W while in normal operation. A
significant proportion of this heat should be removed to meet the dissipation requirement of no more than a
total of 20W [TBC] apportioned to the metrology system within the inner BCA (RD1 & RD2). Each shear
camera will dissipate less than 1W and no explicit cooling will be necessary.
Air cooling for the laser head (RD5 and Figure 6) is required to be a minimum of 4m/s at the 50mm diameter
exit port, at ambient temperature, to remove 80% of the power dissipated in the head.
10 Design
10.1 Metrology Table
The optical layout of the metrology system provides for ten channels of metrology from a single laser which
is placed at one end of the metrology system. Provision for a second laser at the other end of the table should
be made in case one is required to maintain sensitivity of the measurement system. This requires a table area
which is long and narrow though the width could be increased to a standard size or more, if needed to
accommodate other BCA optics, but in any case no more than 1.8m. The layout of the laser metrology
system for the ten delay lines is described in RD4.
The distance between the inside of the south wall of the BCA and the centre of the first delay line
pipe is 5 feet 11 ¾ inches i.e. 1.82m (according to the architectural drawing given in RD6).
The
preferred placement of the optical table along the N-S direction is such that there will be a 0.9m space
between the inner BCA wall and south end of the metrology table. This provides a distance of 920mm
between the edge of the table and the centre of the first delay line pipe (accommodating the 850mm
minimum requirement) and allows for cables from components on the table to be routed into the cable tray
directly above that end of the table. The diagram in Figure 1 in the appendix shows the laser mounted at the
S end of the table and the dimensions for positioning the table. The layout drawing for the metrology bench
within the BCF is available (AD3).
10.2 Connections
The connections between metrology components are listed in Table 2. Each cable is described in more detail
in this section.
10.2.1 Laser metrology
The laser head cable carries both the power supply to the head and the laser reference signal from the head.
The cable is 20m long and has a single connector at the laser but splits into to connectors at the other end.
See Figure 3 and Figure 4 for how the cable is connected. The remote sensor is not shown in Figure 3 but
connects to the remote receiver using a 20m glass optical fibre. The remote receiver is connected to the VME
measurement board using a 5m cable. Agilent require that the receiver modules are powered by +15V which
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