LDS-20000 pages

LDS Series

Model LDS-2000 Laser Doppler Scale

LASER SCALES FOR POSITIONING APPLICATIONS

FEATURES
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High accuracy and high resolution.
No need for periodic calibration.
Non-Contact eliminates parts wear.
Freedom locate point of
measurement close to measured
object reduces Abbe Error.
Orthogonality of positioning system
determined by mirrors not X-Y
stages when using flat mirror target.
Electronics flexibility with variable
increment and automatic
temperature compensation.
No mounting stress on scale.
No thermal expansion on scale.
No need for machined fiat surface
for mounting scale saving
installation costs.
Higher loop gain possible for closed
loop servo control.
Optional hermetic seals for hostile
environments.
Rejection of vibration in two or three
planes reduces structural resonance
effects.

Precision Positioning with Environmental Compensation

DESCRIPTION

SYSTEM COMPONENTS

The LDS-2000 Laser Doppler Scale (LDS)
with Automatic Temperature, Pressure and
Material Thermal Expansion Compensation
provides high speed, high accuracy and long
range positioning for single or multiple axis
applications, such as linear motors, large
gantry machines, CNC machine tools,
CMM's, precision stages, Supermi-crometers,
and other linear measurement devices. The
LDS is compact, easy to install, easy to align,
has less Abbe off-set, no cross coupling, and
is cost effective.

L-109 Laser Head-HeNe Laser head,
ruggedized for direct installation in machine
tool and other positioning applications.
Contains HeNe Tube, Optics and a
Photodetector Receiver. Outputs to IPS 1
Processor Module.

The LDS is compatible with all mainstream
controller feedback systems, and the laser
head is insensitive to dirt, oil, and hostile
environments.

The LDS Laser Head reflects a modulated
laser beam off a movable target. The beam is
detected and processed for displacement
information used by your system controller to
determine position.

Installation is made easy with only four
components; the laser
head, the retroreflector, the
processor
module,
that
produces
either
AQuadB
Square Waves or Up/Down
Pulses and the IACTM
Automatic
Temperature/
Material
Compensation
System. The LDS-2000 can
directly replace glass scales
and other positioning devices
in your existing systems.
Optional cards include RS232,
and Sinusoidal outputs.

IPS1 Processor Module - Contains the
electronics for signal processing and generation
of the AQuadB Square Waves and Up/Down
Pulses. Receives signal directly from the Laser
Head. The processor mounts in the P-108 AC
Powerfeed and Enclosure. The standard output
is Up/Down Pulses. For AQuadB instead of
Up/Down Pulses, please specify at time of
order. The board also provides an error signal
that is a TTL level output, which is LOW to
indicate that the laser signal is low and HIGH
to indicate that the laser signal level is
sufficient for normal operation. An Optional
Error Signal/ Warning Signal Latching Relay is
also available. See IEWR Relay for Warning
and Error
R-102A Retroreflector - 1/2" diameter
retroreflector without post or base. Used to
return the laser beam back to the Laser Head
receiving aperture on a path parallel to the input
beam, regardless of the angle of incidence.
Movement of the retroreflector determines
displacement measurement.
IATCM Automatic Temperature/ Pressure
Compensation (Master) -Consists of an Air
Pressure Sensor, an Air Temperature Sensor, a
Material Temperature Sensor, and a CPU
controlled board. The values of Pressure,
Temperature and Material Temperature are
used to calculate the compensation factor. The
Material Thermal Expansion Coefficient is
loaded into the CPU through the RS-232 port
on your PC. Software is provided to change the