Data sheet: RLD10 0 degree detector head

Data sheet
RLD10 0º detector head
For the fibre optic laser encoder
Renishaw’s RLE fibre optic laser encoder uses
interferometry to provide high resolution, high linearity
position feedback.
The RLE system comprises an RLU laser unit and one or two
RLD detector heads. This data sheet describes the RLD 0º
detector head.
The detector head is the core of the optical measuring system
containing the interferometer, reference optics, fringe detector,
laser shutter and beam steerer.
The head dissipates negligible power (<2 W) and is designed
to be thermally stable.
Two versions of the RLD 0° head are available, one of which
incorporates a plane mirror interferometer (PMI), the other
a retroreflector interferometer (RRI). The fibre optic cable
can be disconnected from the detector unit and the electrical
cable can be disconnected from the laser head, thus allowing
each to be pulled through small cable tracks and ducting. The
detector head incorporates a safety interlock that prevents a
laser beam being emitted if either the fibre or electrical cable
are disconnected.
Laser beam shutter
General outline and dimensions
Laser beams
Ø3 (0.12)
7 (0.28)
Legislative - Laser safety:
Laser beam indicator
38 ±0.2 (1.5±0.008)
4 off fixing screws
19 (0.75)
31.5 (1.24)
4 off M3 x 0.5 x 35 mm or
5-40-UNC x 13/8 cap head screws
on a 38 mm square pitch.
98 (3.86)
13.5 (0.53)
Overall dimensions of the head:
31.5 (1.24)
50 (1.97)
Dimensions in mm (inches)
38 ±0.2 (1.5±0.008)
To complete the interferometer configuration, only one
additional optic is required in either plane mirror or
retroreflector based configurations. For easy installation, the
integral rotary beam steerer allows final adjustments to be
made to optimise beam alignment after the head has been
In accordance with IEC/EN60825-1, IEC/EN60825-2 and US standards 21CFR 1040
and ANSI Z136.1, Renishaw RLE lasers are Class II lasers and safety goggles are not
required, since the blink reaction of a human will protect the eye from damage. Do not
stare into the beam or shine it into the eyes of others. It is safe to view a diffuse-reflected
beam. Do not dismantle the unit in any way; doing so may expose laser radiation in
excess of Class II limits.
The RLD 0º detector
head can be mounted
on either top or bottom
faces providing maximum
Renishaw plc
New Mills, Wotton-under-Edge
Gloucestershire GL12 8JR
United Kingdom
T +44 (0) 1453 524524
F +44 (0) 1453 524901
RLD 0º detector head operating parameters
Axis travel
0 m to 1 m
0 m to 4 m
Optical signal period
λ/4 (158 nm)
λ/2 (316 nm)
System non-linearity error (SDE)*
PMI <±2.5 nm below 50 mm/sec with >70% signal strength *excludes interface
<±7.5 nm at 1 m/sec with >50% signal strength
RRI<±5 nm below 100 mm/sec with >70% signal strength
<±13 nm at 2 m/sec with >50% signal strength
Thermal drift coefficient
<100 nm/ºC
Measured by mounting mirror and detector close together
on a Zerodur® base and changing the temperature
Beam diameter
3 mm
Beam separation
7 mm
Centre to centre
Beam alignment adjustment
±0.65º pitch
±1.5º yaw
Integrated beam steering to simplify beam alignment
Beam alignment tolerance
for plane mirror (1 m axis)
±25 arcseconds
Tolerance applies to both pitch and yaw during operation
Cable length (standard)
3 m
Permanent attachment to the detector head and 15-way
D-type connector at the laser
Cable diameter
6.5 mm
Terminated with a 15-way D-type connector
Fibre diameter (armoured)
5 mm
Removable from the detector head (connector 12 mm diameter)
Component weight 0.25 kg
Operating environment
650 mbar to 1150 mbar Normal atmospheric
0% to 95% RH
10 ºC to 40 ºC
Zerodur® is a registered trademark of Schott Glass Technologies
It is possible to operate an RLE system at axis lengths greather than those
stated above, although the resulting signal strength will be affected by axis
length, system velocity and optical alignment.
Laser beam alignment
The RLD 0º detector head incorporates a beam steerer to simplify the alignment
process. Prior to installation, ensure that the alignment groves are horizontal and
that both locking screws are loose, as shown in Figure 1. Align the head on the 4
mounting screws by securing one of the two nearest the aperture and rotate (yaw)
the detector head until the maximum output signal strength is achieved. To then
increase the output signal strength to its optimum, rotate the beam steerer using
the key, as shown in Figure 1 to adjust the pitch. Finally, tighten the locking screw
on the top side and 4 fixing screws.
RLD identification and ordering
The RLD is normally supplied with the
appropriate RLU laser unit as a configured
RLE fibre optic laser encoder system. For full
details of available RLE system configurations
visit or consult a
Renishaw representative. For special
applications or spares requirements, the RLD
is available separately; the generic form RLD
detector head part number is shown below:
Cable length
Fixing screws
RLD 10 - A 3 - P 0
* P = plane mirror, R = retroreflector
Figure 1
Locking screws
Renishaw reserves the right to change specifications without notice.
© Renishaw plc 2001-2017
For worldwide contact details, please visit our
main website at
0617 Part No. L-9904-2348-05
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