Newport LDS1000 User manual

1EDH0170FE1010 – 09/98

LDS1000 Controller for Laser Diode Sensors

LDS1000

Controller for Laser Diode Sensors

1.0 Introduction

This manual describes the operations and conditions necessary for the

proper use and working of the NEWPORT LDS1000 Controller.

It also provides the basic maintenance operations that are useful to keep

the instrument in good working order.

IMPORTANT

NEWPORT LDS series sensors are measuring instruments that provides

results of measurements. The calibration certificate drawn up by NEW-

PORT for each delivery, or when an instrument is newly calibrated must

ALWAYS be supplied with the sensor. It provides the values of the para-

meters that must be stored in the memory of the LDS1000 electronic

controller so that the instrument gives accurate measurements. BEFORE

any measuring operation, the operator must make sure that the parame-

ters that are used by the electronic controller are the ones that the ins-

trument is designed to use. Refer to the corresponding chapter to check

and modify the sensor parameters.

RECOMMANDATIONS

You are strongly advised to read the chapter entitled “First use” careful-

ly before connecting your autocollimator.

2.0 Description

The LDS1000 Controller is designed to drive sensors of the NEWPORT LDS

series (for example, LDS-Vector autocollimator or STR500-H rectitude sen-

sor). The latter are compact and self-contained measuring instruments.

The LDS1000 electronic controller provides the means of displaying angu-

lar variations by measuring the movement of a spot of light on a position

sensing device. It has the capacity, off-line, to store up to 2048 measu-

rements (14336 measurements with the extended memory option) and to

calculate the averages of these measurements.

When linked to a personal computer it provides the possibility of proces-

sing and recording the measurements.

This manual is designed to facilitate the use of the LDS1000 Controller for

all its modes of operation.

A second user’s manual exists which describes and facilitates the use of

the sensor.

EDH0170FE1010 – 09/98 2

LDS1000 Controller for Laser Diode Sensors

2.1 Equipment

The LDS1000 electronic controller is delivered with:

•A RS-232-C lead.

•The present user’s manual.

•The LDS-TOOLS Software.

•A connection cable (5 or 10 meters, depending on the order).

•As well as the extra accessories and options that may be ordered.

The sensor is delivered in a protection case which contains:

•The optical head.

•The control certificate.

•The present user’s manual.

2.2 Modes of Operation

2.2.1 Manual Mode

The LDS1000 Controller displays angular rotation values of the mirror on a

frontal display screen. The operator uses the display and the active but-

tons on the front panel to:

•Read the measurements.

•Modify the integration constant.

•Define the zero point.

•Program the parameters of the connected sensor.

•Modify the communication parameters (RS-232-C or IEEE-488).

•Activate the analog outputs where available.

Refer to the chapter entitled: “Off-line use”.

ATTENTION RAYONNEMENT LASER

EN CAS D'OUVERTURE

EXPOSITION DANGEREUSE

AU FAISCEAU

RAYONNEMENT LASER

NE PAS REGARDER DANS LE FAISCEAU

APPAREIL A LASER DE CLASSE 2

Puissance maxi = 0,9 mW à 670 nm

3EDH0170FE1010 – 09/98

LDS1000 Controller for Laser Diode Sensors

2.2.2 Remote Mode

When linked to a computer by RS-232-C or IEEE-488 connection, the

LDS1000 Controller communicates by ASCII messages. The buttons on the

front panel of the controller are no longer valid.

The following functions are possible:

•Reading the controller’s programmed parameters.

•Modification of the integration constant.

•Transmission of instantaneous values measured.

•Acquisition in the controller’s internal memory, of a number N of points,

at the frequency F.

•Acquisition in the controller’s internal memory, of a number N of points,

at the frequency F, the beginning of the acquisition is started by an

external signal (Trigger).

•Acquisition in the controller’s internal memory of a number N of points,

each acquisition being started by an external signal (Trigger).

Refer to the chapter entitled: “Use with a computer interface”.

2.2.3 Analog Mode

Analog outputs are only available on models that are equipped with this

option. This must be specified at the time of ordering.

There are two voltages at the analog outputs that are respectively propor-

tional to the angular measurements Y and Z of the equipment.

This enables:

•Connection to an analog acquisition chain.

•Visualization of positions on an oscilloscope.

•Use of the LDS-Vector autocollimator for analog controls.

These outputs are obtained by a digital/analog conversion of the values

calculated by the controller.

This conversion is carried out in real time at a frequency of 2000 Hz.

Refer to the chapter entitled: “Off-line use”.

2.3 Available Versions

2.3.1 Controller

The electronic controller is available in eight versions that offer different

measuring possibilities. The references are as follows:

LDS1000 Controller LDS1000-OPT BB CC

with: BB NN No cable.

01 Cable length 5 meters.

02 Cable length 10 meters.

CC NN No controller.

02 Standard controller European standard (220V,

2manuals and EU cable).

12 Analog option controller, EU standard.

22 14K memory option controller, EU standard.

32 2-option controller, EU standard.

EDH0170FE1010 – 09/98 4

LDS1000 Controller for Laser Diode Sensors

2.3.2 Sensors

Autocollimator, bilingual user’s manual LDS-Vector

Rectitude sensor, bilingual user’s manual STR500-H

2.3.3 Accessories and Additional Equipment Kits

Calibration blade kit, with certificate LDS-CAL01

2-theta adjustable mount LDS-SL

2-theta + XY adjustable mount LDS-SLXY

4 movement adjustable mount on X26 (complete, for LDS-Vector)

LDS-X26-V

2.4 Dimensions

329.5 (Depth 352)

IEEE-488

RS-232-C

Y & Z

Outputs

Sensor

Connector

– Front View –

– Rear View –

83.5

PWOK

Input

TRIG

Input

5EDH0170FE1010 – 09/98

LDS1000 Controller for Laser Diode Sensors

3.0 Principle of Operation

3.1 Laser Diode Sensors

Laser diode sensors of the NEWPORT LDS series use identical technologies

for the emission and reception of optical signals, but according to a diffe-

rent optical diagram.

The emission is performed by a Laser diode controlled and modulated at

10 kHz.

The reception is performed by a position sensing device that provides ana-

log voltages.

From the electronic controller’s point of view, that becomes:

•Supply the necessary power to the laser diode and to the pre-amplifying

electronic controller.

•Monitor break down and defects.

•Collect the return signals from the analog sensor.

This data is processed by the controller, corrected according to the para-

meters provided by calibration and usable depending on the different

modes (display, memorization, transmission to the computer interface,

analog output [available as an option]).

3.2 Electronic Controller

The LDS1000 Controller performs:

•Fast acquisition at a set frequency of 2 kHz.

•Analog to digital conversion.

•Correction and integration calculation.

•Memory and display management.

Its technology is based on a 68000, 16 MHz microprocessor.

This controller offers a clear display of the values measured on a luminous

screen and communication via RS-232-C and IEEE-488 interfaces.

One particular model is available with calibrated analog outputs, that are

proportional to the values measured.

EDH0170FE1010 – 09/98 6

LDS1000 Controller for Laser Diode Sensors

4.0 Specification

The LDS1000 Controller can be used in conjunction with various optical

heads.. The dependent characteristics of the optical head are given in the

individual manuals.

The measurement results can only take on their full meaning in relation to

a unit that represents the value to be measured (distance, angle…). The

controller enables the result to be displayed on the unit that corresponds

to the sensor used.

4.1 General Characteristics

4.1.1 LDS-Vector Optical Head (example of Sensor)

•Wavelength 670 nm

•Peak power 900 µW

•Modulation 10 kHz

•Beam diameter 31 mm

•Beam direction <0.5 mrad in relation with autocollimator body

•Equivalent focal length 280 mm

•Beam divergence 0.1 mrad

•Ocular field ±15 mrad

•Measurement range ±2000 µrad

•Weight 1.065 kg

4.1.2 LDS1000 Controller

•Microprocessor 68000 (32 bits - 16 MHz)

•Display 2 x20 characters, adjustable brightness

•Interfaces RS-232-C and IEEE-488

•Measurement memory 2048 spots or

14336 spots depending on the option

•Analog output Available as an option

•TTL TRIGG input Measurement synchronization

•TTL PWOK output Beam signal

•Power supply 90/264 VAC, 50/60 Hz

•Consumption 30 VA

4.1.3 Measurements

•Digital resolution 0.1 µrad

•Measurement range ±2000 µrad

•Measurement error ±(1 ±0.02 xmeasurement.) µrad (i.e. ±2%)

•Max. measuring noise 0.02 µrad/√Hz

•Sampling frequency 2000 Hz

•Digital integration from 0.5 msec to 1 sec

7EDH0170FE1010 – 09/98

LDS1000 Controller for Laser Diode Sensors

4.1.4 Environment

The performances of an optical sensor greatly depend on the conditions in

which it is used.

The contractual characteristics are specified in the manual that goes with

each sensor of the LDS series.

The operating limits of the LDS1000 Controller are the following:

•Operating temperature +15 °C to +25 °C

•Humidity 10% to 80%

•Storage temperature -10 °C to + 50 °C

Refer to the paragraph entitled “Specification Validity” in each user’s

manual for the performances of the sensors according to the conditions of

use.

4.1.5 RS-232-C and IEEE-488 Interfaces

RS-232-C interface

Baud rate 300 to 19200

IEEE-488 interface

Mode SRQ management

4.1.6 Analog Outputs

Analog outputs are only available if the option has been chosen.

•Refresh frequency 2000 Hz

•Digital low-pass filter 1 to 2000 Hz

•Output range ±10 V

•Scale factor 5 mV/incr to 1000 mV/incr

•Resolution 0.5 increment

•Electronic noise 1 mV rms

•Distortion 0.5% (electronic)

•Maximum Offset 50 mV typical

•Output impedance 10 Ω

•Discrepancy equivalent to a pure delay of 1.1 msec (without integration).

•Attenuation equivalent to the one of an order 1 low-pass filter with

600Hz cutoff frequency.

WARNING: SPECTRAL WITHDRAWAL

The analog outputs use an intermediary calculation stage that is based

on a sample at 2000 Hz. This will limit the use of the LDS sensor for stu-

dying signals that do not have a significant spectral component over

1000 Hz (this sort of component would find themselves “withdrawn” and

would appear for lower frequencies).

4.2 Validity of Specifications

Refer also to the paragraph entitled “Specification Validity” in each user’s

manual for the performances of the sensors according to the conditions of

use.

EDH0170FE1010 – 09/98 8

LDS1000 Controller for Laser Diode Sensors

4.2.1 Calibration

A reading of the linear errors according to the angle measured is provided

with each sensor. This calibration certificate gives, in particular, the value

of the principal parameters to be used to configure the LDS1000 electronic

controller:

•S/N: Series number of the optical head.

•Type: RT (Rotation) for LDS-Vector or TR (Translation) for STR500-H.

X: Beam Axis; Y: Horizontal Axis; Z: Vertical Axis.

–Type RT (Rotation):

Y: Rotation around Y axis.

Z: Rotation around Z axis.

–Type TR (Translation):

Y: Parallel translation with Y axis.

Z: Parallel translation with Z axis.

•Ycoef:Linear correction factor for axis Y.

•Yincr:Count increments for axis Y.

•Yunit:Unit displayed for axis Y.

•Yofs1, Yofs2:Channel Y electronic offsets.

•Zcoef:Linear correction factor for axis Z.

•Zincr:Count increments for axis Z.

•Zunit:Unit displayed for axis Z.

•Zofs1, Zofs2:Channel Z electronic offsets.

These parameters were optimized when the instrument was calibrated in

order to obtain the best results. You are advised not to modify them

without reason.

These parameters have been defined for the following conditions of use:

•Temperature 22 °C ±2 °C

•Mirror diameter >31 mm

•Reflectivity 80% at 670 nm

•Working distance 0.1 m

4.3 Noise Reduction

The LDS1000 Controller constantly carries out acquisitions at a rate of 2000

values per second.

These acquisitions are dealt with on request (transformation of electric

signals into metrological values) for display or emission on a connection.

Depending on the programming of the electronic controller, the returned

value corresponds either to the last acquisition carried out (no average) or

to the average of the last N acquisitions.

ATTENTION RAYONNEMENT LASER

EN CAS D'OUVERTURE

EXPOSITION DANGEREUSE

AU FAISCEAU

RAYONNEMENTLASER

NEPAS REGARDER DANS LE FAISCEAU

APPAREILA LASER DE CLASSE 2

Puissancemaxi = 0,9 mW à 670 nm

9EDH0170FE1010 – 09/98

LDS1000 Controller for Laser Diode Sensors

In the second case, a low-pass digital selection is carried out which reduces

the noise.

The noise reduction evolves like the square root of the number N of avera-

ged samples, which is itself equal to the averaging time to acquisition per-

iod ratio.

The acquisition period is always equal to 0.5 msec (2 kHz).

The duration of the averaging is fixed by the integration constant that can

be parametered INTG.

Refer to the user’s manual of the LDS sensor concerned.

4.4 Offset Coefficient Adjustment

The Yofs1, Yofs2, Zofs1 and Zofs2 coefficients are normaly set to zero

value.

When the reflected light is becoming low, because of poor reflectivity or

small mirror aperture, it is necessary to take into account the value of the

electronic offsets of the detector.

The LDS1000 Controller is designed to make this correction very easily, by

introducing offset coefficients into its memory.

The following procedure must be accomplished:

❶The values of offsets are reached when the instrument does not receive

any light.

In order to get these values, place a black screen in front of the exit

pupil of the instrument.

The requested values are then dispayed by the LDS1000 in the specific

test mode, described in chapter 7.3.

=> (F5) => (F4) => (F2)

The first line gives Yofs1 and Yofs2.

The second line gives Zofs1 and Zofs2.

❷Take notes of these values and go to LDS1000 parameter setting, as

explained in chapter 7.4.

EDH0170FE1010 – 09/98 10

LDS1000 Controller for Laser Diode Sensors

5.0 Starting the Equipment

5.1 Setting Up

The setting up of the sensor is explained in each user’s manual of the LDS

instruments.

RECOMMANDATION

You are advised to read the user’s manuals corresponding to each sensor

delivered. They contain important information for optimal use of the ins-

truments. These instructions can vary from one sensor to another.

5.1.1 Mounting

Small movement measurements require specific precautions as far as the

quality of the mounting of the equipment is concerned. It is particularly

important to make sure that the sensor, the reflector and their correspon-

ding supports are solid

5.2 Electric Connections

CAUTION

Before connecting check that all equipment is switched off.

CAUTION

Do not use any cable other than the one supplied by NEWPORT.

The cable provided connects the sensor to the electronic controller. The

male part should be connected to the optical head, the female part to the

controller. Please ensure that all connections are correctly screwed in.

The cable is available in two standard lengths:

Cable for LDS1000, length 5 meters LDS1000-OPT01NN

Cable for LDS1000, length 10 meters LDS1000-OPT02NN

For longer lengths, please consult us.

A lead ensures the connection to the mains supply on a switch and fuse

base.

The controller is equipped with a self-selecting input voltage power supply

(from 90 V to 250 V).

Set the switch to "0" (OFF) position.

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