Halo Photonics Stream Line XR Hardware Manual

Scanning doppler lidar system

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Halo Photonics Stream Line

Our modular, autonomous, turn-key, pulsed Doppler LiDAR systems were conceived to meet the need for remote

sensing of motion and backscatter in the atmosphere. In this mode of operation, naturally occurring aerosols and

clouds act as a distributed target and backscatter the transmitted pulses. The receiver detects the Doppler shift

brought about by the motion of the distributed targets and therefore the line-of-sight component of their velocity. The

novel optical technology employed and the design approach have led to a new class of eye-safe (Class 1M), high

performance LiDAR exhibiting exceptional stability which is compatible with a continuous and unattended mode of

operation. Typical applications include boundary layer wind profiling, plume dispersion, analysis of complex flows,

cloud studies, cloud base measurements and gust and air quality monitoring.

While every effort has been made to provide accurate and calibrated data products, HALO Photonics does not

currently guarantee the calibration of the data in absolute terms.

The system has been designed to be rugged and autonomous. Even so, the end user must respect the fact that the

system is a precision optical instrument that must be treated with great care.

The laser emission from the antenna is in the class 1M category. The responsibility for ensuring suitable safety

procedures and operating modes lies entirely with the end user. HALO Photonics does not accept any

responsibility for issues relating to the field deployment of the equipment and propagation of the beam in the

atmosphere.

Scanning Doppler LiDAR system - Hardware Guide

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Summary of Contents for Halo Photonics Stream Line XR

Page 1 Typical applications include boundary layer wind profiling, plume dispersion, analysis of complex flows, cloud studies, cloud base measurements and gust and air quality monitoring. While every effort has been made to provide accurate and calibrated data products, HALO Photonics does not currently guarantee the calibration of the data in absolute terms.
Page 2 General notes on the LiDAR PC and the use of third party software. • The LiDAR contains a PC, running Windows XP or 7. It is an embedded, ruggedised unit, which controls the LiDAR and acts as a storage system for the collected data. We would encourage users to treat the PC as a sophisticated embedded controller, and not as a general use PC.
Page 3 Operating. No parts of the LiDAR are to be removed or adjusted in any way without the permission of Halo Photonics with the exception of the lifting handles and mast if fitted. The settings file is not to be modified without permission of Halo Photonics.
Page 4: Table Of Contents
Table of contents Transit Case – Packing and Unpacking Connections Power requirements and the UPS module Powering up Orientation and levelling Site considerations Routine cleaning Typical thermal characteristics Returning a system...
Page 5: Transit Case - Packing And Unpacking
1. Transit Case – Packing and Unpacking. [Back to contents] For transportation, the LiDAR and its power supply unit are housed in a transit case that has a removable wheeled base, with all of the wheels having integral brakes. The transit case with LiDAR weighs approximately 110Kg and will need to be moved according to the appropriate manual handling health and safety guidelines.
Page 6 There are three locating areas machined into the legs that match the width of the leg clamps. The LiDAR will be delivered with the clamps set to the lowest position, and it is recommended that it be left at this position.
Page 7: Connections
2. Connections. [Back to contents] From left to right: RJ45-X – This is for use with an RJ45 crossover cable, which will directly connect the internal PC to another PC. Power LED and recessed internal PC power button. The button will act in exactly the same way as a regular desktop PC power button. If the shutdown software has been run and the PC is switched off, but the system is still powered, then a short press (duration of ½...
Page 8 This picture shows the two mast connectors, another un-wired smaller connector, and the white purging line. The arrow on the power connector faces away from the LiDAR when it is the correct orientation. The connector is a ¼ turn bayonet type. Ensure that it is properly inserted and locked into position.
Page 9: Power Requirements And The Ups Module
3. Power requirements and the UPS module. [Back to contents] • The LiDAR operates from 24V DC +/- 10%. The supply voltage can sometimes be pulled down to be outside of this range when the LiDAR’s thermal control system is working hard – so it’s best to adjust the input voltage presented to the UPS module to 25.5V no-load.
Page 10 • The LiDAR draws ~ 7A at 24V DC. • If the active thermo-electric cooler (TEC) system is fitted, it can draw up to an additional 7A when fully cooling. The temperature spec of the LiDAR with this option is -20 to +40C. •...
Page 11: Powering Up
4. Powering up. [Back to contents] If the unit has been allowed to cool down to below 15ºC, then additional time will be needed before the unit can be run. Ideally, the system should be stored at room temperature (20ºC) for at least 24 hours prior to deployment.
Page 12: Orientation And Levelling
5. Orientation and levelling. [Back to contents] It is possible to enter a bearing during software setup, which will then be used in conjunction with all of the azimuth co-ordinates in the scan files. If the LiDAR is aligned to face north when in its home position (recommended), then a bearing of 0º...
Page 13: Site Considerations
6. Site considerations. [Back to contents] It is strongly recommended that the LiDAR be deployed on a surface that is not liable to get excessively hot, as the cooling aggregate (air-flowed heat exchanger) is located on the underside of the base plate. Steps should be taken to minimise the heat generated underneath the LiDAR from direct sunlight - a turfed area is ideal, or shading if possible.
Page 14: Routine Cleaning
7. Routine cleaning. [Back to contents] Heat exchanger fans. If the LiDAR is in a dusty environment, it may be necessary to blow the dust from around the heat exchanger fans with an air duster. The fans should also be checked routinely to make sure that they are both spinning without obstruction. Wiping brush.
Page 15: Typical Thermal Characteristics
8. Typical thermal characteristics. [Back to contents] The graph below illustrates the expected averaged internal temperature versus the external ambient temperature for the two different standard temperature specifications. The external ambient temperature is defined here as the temperature of the air being drawn into the heat exchanger on the underside of the lidar. Depending upon the characteristics of the ground, this may be hotter than the temperature as measured in the conventional way for meteorological reporting.
Page 16: Returning A System
9. Returning a system. [Back to contents] Before returning a system to Halo, please ensure that the following preparatory steps are followed. If the system is being returned due to an internal computer fault, then it is recognised that some of the following steps will not be possible.