Droplet CDP-2 Manuel utilisateur
Cloud Droplet Probe
(CDP-2)
Operator Manual
DOC-0343, Rev A
Includes Documentation on
Particle-by-Particle Feature
2400 Trade Centre Avenue
Longmont, CO 80301-5727 USA
DOC-0343 Rev A
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
II
2400 TRADE CENTRE AVENUE
LONGMONT, COLORADO, USA 80503
TEL: +1 (303) 440-5576
FAX: +1 (303) 440-1965
WWW.DROPLETMEASUREMENT.COM
All rights reserved. No part of this document shall be reproduced, stored in a retrieval system, or
transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without
written permission from Droplet Measurement Technologies, LLC. Although every precaution has
been taken in the preparation of this document, Droplet Measurement Technologies, LLC. assumes
no responsibility for errors or omissions. Neither is any liability assumed for damages resulting from
the use of the information contained herein.
Information in this document is subject to change without prior notice in order to improve accuracy,
design, and function and does not represent a commitment on the part of the manufacturer.
Information furnished in this manual is believed to be accurate and reliable. However, no
responsibility is assumed for its use, or any infringements of patents or other rights of third parties,
which may result from its use.
TrademarkInformation
All Droplet Measurement Technologies, LLC. product names and the Droplet Measurement
Technologies logo are trademarks of Droplet Measurement Technologies, LLC.
All other brands and product names are trademarks or registered trademarks of their respective
owners.
Warranty
The seller warrants that the equipment supplied will be free from defects in material and workmanship
for a period of one year from the confirmed date of purchase of the original buyer. Service procedures
and repairs are warrantied for 90 days. The equipment owner will pay for shipping to DMT, while DMT
covers the return shipping expense.
Consumable components, such as tubing, filters, pump diaphragms, and Nafion humidifiers and
dehumidifiers are not covered by this warranty.
Manual, Cloud Droplet Probe (CDP-2)
DOC-0343 Rev A III
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
LaserSafetyInformation
TheCDPcontainsaclassIIIBlaser.AVOIDDIRECTEXPOSURETOTHEBEAM.Observelasersafety
precautionsandwearappropriatelasersafetyglasses.Avoidplacingreflectivematerialsinthebeam
thatcouldredirectthebeam,includingwatchbands,ringsortools.
STRICTOBSERVANCEOFTHEFOLLOWINGWARNINGLABELSISADVISED.
ThefollowinglabelislocatedontheCDP:
DOC-0343 Rev A
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
4
CONTENTS
1.0ProductDescription............................................................................................8
1.1Introduction...........................................................................................................................8
1.2GeneralSpecifications...........................................................................................................9
1.3ElectricalSpecifications.......................................................................................................10
1.4PhysicalSpecifications.........................................................................................................10
1.5OperatingLimits..................................................................................................................10
2.0ProbeSetup.......................................................................................................11
3.0TheoryofOperation..........................................................................................11
3.1PbPOption..........................................................................................................................13
3.2CDPDataAcquisitionFeatures............................................................................................13
4.0ParticleAnalysisandDisplaySystem(PADS)......................................................14
5.0DynamicThresholdFeature...............................................................................15
5.1DynamicThresholdforSizerSignal.....................................................................................15
5.2DynamicThresholdforQualifierSignal...............................................................................16
6.0InstrumentMaintenanceandTroubleshooting..................................................16
6.1TroubleshootingwithHousekeepingChannels...................................................................16
7.0Calibration.........................................................................................................18
7.1RequiredEquipment...........................................................................................................19
7.2Instructions..........................................................................................................................20
AppendixA:RevisionstoManual...................................................................................23
AppendixB:GlassBeadtoWaterDropletConversionTableforCDP‐2s..........................24
AppendixC:CDPAlignmentResponse............................................................................25
AppendixD:CommunicationsbetweenthePCandCDP..................................................30
CommunicationsParameters..........................................................................................................30
InitiatingCommunications..............................................................................................................32
CommunicationsCommands..........................................................................................................32
SETUPDATACommand...................................................................................................................32
DefinitionoftheDeclaredParameters...........................................................................................34
CDPResponsetoSETUPDATACommand.......................................................................................34
Manual, Cloud Droplet Probe (CDP-2)
DOC-0343, Rev A 5
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
SENDDATACommand.....................................................................................................................35
CDPResponsetotheSENDDATACommand..................................................................................35
DefinitionsoftheSendDataResponseparameters....................................................................37
ResponseDataPacketLengthandTransmissionRate................................................................38
CDPHousekeepingChannels........................................................................................................39
SENDPbPDATACommand..............................................................................................................40
CDPResponsetotheSENDPbPDATACommand...........................................................................40
ResponseDataPacketLengthandTransmissionRate................................................................41
DefinitionsoftheSENDPbPDATAResponseparameters...........................................................42
ChangingtheSerialInterfaceType..................................................................................................42
AppendixE:MountingConsiderations............................................................................43
AppendixF:DMTInstrumentLocator—OperatorGuide.................................................45
Purpose............................................................................................................................................45
Installation.......................................................................................................................................45
Operation.........................................................................................................................................45
AppendixG:CDP‐2DimensionalDrawing.......................................................................46
AppendixH:ThresholdTableforCDP‐2.........................................................................48
List of Figures
Figure1:CloudDropletProbe...........................................................................................8
Figure2:CDPTheoryofOperation..................................................................................12
Figure3:CDPwithImportantComponentsLabeled........................................................13
Figure4:CDPData,Histogram,andParticleImages........................................................14
Figure5:IdentifyingaNoiseBand..................................................................................15
Figure6:DisplayofCalibrationTestResults.Notethedefinitepeakinthe12‐14µm
particlerange...........................................................................................................18
Figure7:CompressedGasCansor“Dusters”..................................................................19
Figure8:BottleofGlassBeads,DMTOP‐0591‐0020.......................................................19
DOC-0343 Rev A
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
6
Figure9:GlassBeadDispenser,DMTAD‐0164................................................................20
Figure10:CleaningtheGlassBeadDispenser..................................................................20
Figure11:TappingtheBeadDispensertoDislodgeBeads...............................................21
Figure12:DispenserwithFilmofBeadsonBottom.........................................................21
Figure13:CDPCalibrationFixture...................................................................................22
Figure14:ReleasingGlassBeadsintotheCDP.NotethispictureisofaCDPattachedtoa
CCP;operationisthesameforstand‐aloneCDPs.....................................................22
Figure15:8‐mglassbeadsCDPaligned.........................................................................25
Figure16:8‐mglassbeadsCDPmoderatemisalignment...............................................26
Figure17:8‐mglassbeadsCDPseveremisalignment....................................................26
Figure18:20‐mglassbeadsCDPaligned.......................................................................27
Figure19:20‐mglassbeadsCDPmoderatemisalignment.............................................27
Figure20:20‐mglassbeadsCDPseveremisalignment.................................................28
Figure21:40‐mglassbeadsCDPaligned......................................................................28
Figure22:40‐mglassbeadsCDPmoderatemisalignment............................................29
Figure23:40‐mglassbeadsCDPseveremisalignment.................................................29
Figure24:20‐mglassbeadscalibrationoverload..........................................................30
Figure28:CDPMountingInformation.............................................................................43
Figure29:CDPElectronicsMounting...............................................................................44
Figure30:InstrumentLocator.........................................................................................46
Manual, Cloud Droplet Probe (CDP-2)
DOC-0343, Rev A 7
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
List of Tables
Table1:PC‐CDPCommunicationsParameters................................................................31
Table2:DataStructuresUsedinCDP‐HostComputerCommunications..........................31
Table3:SetupCommand–DataPacket..........................................................................33
Table4:CDPResponsetoSetupCommand–DataPacket..............................................35
Table5:SendDataCommand–DataPacket...................................................................35
Table6:CDPResponsetoSendDataCommand‐‐DataPacket.......................................37
Table7:ConversionEquationsforAnalog‐to‐DigitalHousekeepingChannels.................39
Table8:SendPbPDataCommand–DataPacket............................................................40
Table9:CDP‐PBPResponsetoSendPBPDataCommand–DataPacket.........................41
DOC-0343 Rev A
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
8
1.0 Product Description
1.1 Introduction
TheCloudDropletProbe(CDP)isdesignedtomeasureclouddropletsizedistributionfrom2µmto
50µm.TheCDPandanappropriatedatasystemcanalsocalculatevariousotherparameters
includingparticleconcentrations,effectivediameter(ED),MedianVolumeDiameter(MVD),and
LiquidWaterContent(LWC).
DropletMeasurementTechnologies(DMT)hasimplementedstate‐of‐the‐artelectronicsandoptics
thatofferflexibilitytotheCDPuserinavarietyofapplications.Theminiaturizedandstreamlined
housingallowsuseinavarietyofground‐basedorairborneapplications.
TheParticleAnalysisandDisplaySystem(PADS)offersagraphicaluserinterfaceatthehost
computer.PADSprovidescontrolofCDPmeasurementparameterswhilesimultaneouslydisplaying
real‐timeparticlesizedistributionsandderivedparameters.Allstandarddatainterfacesaredone
vialinedriversmeetingtheRS‐422electricalspecification,allowingcablelengthsofupto100
meters.
Figure1showstheCDP.FordetailsonspecificcomponentswithintheCDPhousing,seeFigure3.
TheCDPprobehousingcontainstheforward‐scatteropticalsystem,whichincludesalaserheating
circuit,photodetectors,andanalogsignal‐conditioning.Thesignalsaretransmittedviaarobust
differentialdriver/receiverinterfacetotheCDPElectronicsModule,orCDPE.There,thesignalsare
receivedandprocessed,particlepulsesaredigitizedandcategorized,eightdifferent
“housekeeping”parametersaretracked,andaserialdatastreamineitherRS‐422orRS‐232
standardformatissentontotheuser’sdatasystem.
Figure 1: Cloud Droplet Probe
Manual, Cloud Droplet Probe (CDP-2)
DOC-0343, Rev A 9
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
1.2 General Specifications
Measured Parameters: Single-particle light scattering
Derived Parameters:
Particle diameter
Particle number concentration
Liquid water content (LWC)
Effective diameter (ED)
Median volume diameter (MVD)
Measured Particle Size Range:
2 µm – 50 µm
Number Concentration Range: 0 – 2,000 cm3
Typical Sample Area: 0.24 mm²
Air Speed Range: 10 - 250 m/sec
Sampling Frequency: Selectable, 0.04 sec to 20 sec1
Refractive Index: non-absorbing, 1.332
Light Collection Angles: Optical design: 4 - 12
Optical performance: 1.7 - 14
Laser: 658 nm, up to 50 mW
Data System Interface: RS-232 or RS-422 serial interface
Calibration: Precision glass beads
1 Versions of the Particle Analysis and Display System (PADS) earlier than 3.5 assume a
sampling frequency of 1 sec / 1 Hz. As a result, this frequency is recommended if you are using
PADS 2.7 or earlier. CDP-PBPs are also limited by the baud rate; a sampling g rate of
faster than 2 Hz may compromise the data.
2 A refractive index of 1.33 for water is the industry standard. Contact DMT for support for
measuring particles with other refractive indexes.
DOC-0343 Rev A
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
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1.3 Electrical Specifications
System: 28VDC at 2A
Anti-Ice: 28VDC at 12A
1.4 Physical Specifications
Probe Weight:
1.37 kg / 3.0 lbs (standard version); a
lighthweight UAV version is also
available
Electronics Box and Header Cable
Weight: 0.82 kg / 1.8 lb
Probe Dimensions: 26.7 cm L x 17.5 cm W x 21.6 cm H
(10.5” L x 6.9” W x 8.5” H)
Electronics Box Dimensions: 17.8 cm L x 8.9 cm W x 5.1 cm H
(7.0” L x 3.5” H x 2.0” H)
1.5 Operating Limits
Temperature: -40 to +40 °C
Altitude: 0 - 50,000 feet
Humidity: 0 - 100%, non-condensing
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