www.norsonic.com

Product Data

Innovative sound instrumentatiton

Acoustic CameraNor848A

• Three array sizes with up to 384 microphones available

• Real time virtual microphone

• Digital microphones, no extra acquisition unit needed

• Intuitive software

• Plug and play within 5 minutes

Features• Robustcamerafront-endbasedonacircularcarbonfibredisc,threesizesavailable:-128microphones0.4meterarray,only2.5kgweight-256microphones1meterarray,only11kgweight-384microphones1.6meterarrayforlowerfrequencyanalysis

• Nointerfaceboxbetweenarrayandlaptop,directconnectionwithLANcable

• Listentoandanalyserealtimeaudiofromvirtualmicrophoneposition

• Virtualmicrophoneenablesyoutolistentothesoundcontributionfromanysourcerealtime,filteredwithyourselectedfrequencyrange

• Microphonesonadiscpreventsoundandechofrombehind

• Lowself-noiseandlargemeasurementrange

• RPMoptionforanalysingrotatingmachines.

• High-performanceopticalvideocameraisincludedinthecamerafront-endunit

• Thedistributionofthehighnumberofmicrophonesensureshighresolvingpowerandreducestheproblemsduetosidelobeeffectscomparedtomostotheracousticcameras

• Digitalmicrophonesensurelargedynamicrangeandhighstability

• SimpleconnectiontotheincludedMacBookProcomputerthroughasingleLAN-cable.

• Allpartsareintegratedinthecamerafrontend–noneedforasignalprocessinginterfacebox

• OperatedonmainsorDCinput

• Recordsthesignalfromeverymicrophone

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Nor848A

Noise abatement planning for environmental noise

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Nor848A

TheNorsonicNor848Asetsanewstandardforacousticalcameras.Thelargenumberofmicrophoneseliminatestheproblems of ghost-spots, compared to traditional acous-tical cameras where the relatively low number of micro-phones increases theside lobeeffect, resulting in thesocalledghost-spoteffectwhereyoumaymeasureanon-existingsource.TheNor848Asoftware isextremely intui-tiveandeasy touse.Justaftera fewminutesof training,theuser is able tooperate the systemanddo realmea-surements.Threecamerafrontendsareavailable.A0.4marraywith128microphones,a1meterarrayholding256microphonesanda1.6meterarraywith384microphones!Thesystemenablestheusertoperformnoiseanalysiswithaclearviewofthespatialdistributionofthesoundinrealtime!Thesystemiseasytosetupinthefield.Justpowerthe

self-containedunitfrommainsorbatteryandconnecttheLANcableto thecomputer.Thesystemisreadytomea-sureinjustafewminutesafterenteringthesite.Thesoundsignalfromeverymicrophoneaswellasthe

videofromtheintegratedopticalcameraarerecordedandstoredinthecomputer.Bothlivelevelplotsaswellaspost-processed analysis with refined resolution are availablewith the user friendly software package that runs on theincludedstate-of-the-artMacBookProcomputer.Bymoving the cursor in the picture youmay analyse

andlistentothesoundintheselecteddirections–inrealtime!Thisenablestheusertoidentifytheproblem,whetherit isanannoyingsound,a leakageorotherdifficultnoiseproblemsinjustafractionoftimecomparedtotraditionalmethods.

Easy operationTheacousticcameraNor848hasbeendesignedwiththeoperatorinmindandisverysimpletooperate • Setupthefront-endinthedesireddirection

• ConnecttheLANcablebetweenfrontendandcom-puter

• Powerthefrontendandcomputer–mainsorbattery

• Viewthenoisesourcesinreal-time

• Pressthestartrecordbuttontosaveameasurementrecordingforfurtheranalysis

Thevideofromthewide-angleopticalcameraandthesig-nalfromallmicrophonesarerecordedonthehard-diskofthe computer. The filename is automatically picked fromthe timeof thedayandmayeventuallybegivenamoredescriptivename.Selectavirtualmicrophonepositionby thecursorpo-

sitionandthe focusdistanceand listen to thesignalandperformafrequencyanalysis–inrealtimeorafterthemea-surement.Manyoperatorshavefoundthatlisteningbytheearsandlookingatthelevelpictureisveryusefulinfindingnoisesources.Essentially,onlytheplacementofthefrontendisimpor-

tantforagoodrecordingsinceallparameterslikefocaldis-tanceandlevel-andfrequency-rangemaybeselectedatanylatertime.Thereisnoinitialsettingthatcanbemadewrong

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The large number of microphone elements applied in Nor848 is the basis for high angular resolving power and the low side-lobes – typically more than 25 dB below the main lobe. This reduces the amount of ghost-spots and makes the pictures easier to analyse.

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Nor848A

Thumbnailsofrecordings

SetthefrequencyrangeforanalysisSelectthecolourrange

PlaybackcontrolRecordbutton

Online analysing software - intuitive and easy to use!

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Nor848A

RPMandordertracking

Timeaxis

Virtualmicrophonepositionselectedbythecursor.Usedforanalysisandlistening

Listen to broadband or selectedfrequencyband

A,Corflatweightingselection

Setthefocaldistance

Display the spectrum as FFT,1/3or1/1octave

Soundlevelhistory

Videoframesforquicknavigationwithinrecording

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Nor848A

DCRPMLAN-cable

Thedigitalmicrophoneelementsareprotectedbehindthedisc-shapedcarbonfibreenclosure.Adustandwaterrepellentmeshisprotectingthemicrophonesfromdustandmoisture.Therobustandsturdyconstructionalsoensuresthatallmicrophonesarekeptinthecorrectposition–importantforfieldapplications.Thesmalldistancebetweenthemicrophonesintheinnercircleisimportantforlowspatialaliasingathigherfrequencies.Thelargenumberofmicrophonesalsocontributestothewidemeasurementrangeandthelowself-noise.The

signalintheselecteddirectionisbasedontheweightedaverageofallmicrophonesandisthereforefarbelowtheself-noisefromasinglemicrophone.Allowsmeasurementsoflevelsbelowwhatisachievablewithanormalsoundlevelmeter.

Thebacksideoffront-endcontainstheconnectorsDCpowerormainsviamainsadaptor,twoexternalsignalinput(RPMinput)andthecomputerinterface(LAN).Thecomputerrunsontheinternalbatteryforabouttwohours.Alternatively,usetheenclosedmainsadapter/chargerorexternalbatterypack.

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Nor848A

Leakage localization for building acoustics applications

0.4 meter array 1 meter array 1.6 meter array

Number of microphones 128 256 384

Type digitalmems

AD converter 4thorderDeltaSigma

Resolution 16bit/sample

Sampling rate per sample 48kHzefficientafterdownsamplingandantializingfrom2,1Mhz

AC coupling 3dB frequency 20Hz

Max sound level (re. 20 µPa) 110dB

Noise level, A-weighted 10dB

Microphone frequency range 20Hz–20kHz

Mapping frequency range 316Hz-15kHz 125Hz–15kHz 80Hz–15kHz

Sampling frequency 44.1kHz

Analysing spectrum 1/1octaveor1/3octaveorFFT

FFT spectra 4096lines11,8Hzlinewidth

Focal distance 0,5mtoinfinity

Optical camera resolution 1600x1200

Optical camera frame rate 15frames/sec

Optical/acoustic covering angle ±48,5°horizontal±35°vertical

Temperature range -10°Cto+40°C

Humidity range upto90%RH

Mains supply (via mains adaptor) 100-230V(50-60Hz)

DC supply 11–36V

Power consumption frontend Max.20W

Disc diameter 43cmx4.5cm 103cmx4.5cm 164cmx4.5cm

Weight (excl. tripod) 2,4kg 11kg 16kg

Ingress protection code IP40

Specifications

P.O.Box24,N-3421Lierskogen,NorwayTel.:+4732858900 Fax.:+4732852208info@norsonic.com www.norsonic.com

Distributor:

PD848AEd2Rv0En0513

Nor848A

Accessories• BatterypackNor342withchargerNor343andcableNor4574(>4houroperation)

• Nor848/Tripod–RuggedtripodforAcousticcamerafrontendincludingdetachablewheelsanddetachabletripodholderforMacBook.Fitsallcameradiscssizes.Weight11.4Kg

• Nor848/TripodL–Lightweightedtripodfor0.4mAcousticCameraFrontend.Weight2.8Kg

• PlugforDCinput,(LemoFGG.1K302.CLAC65Z)

• PlugforRPMinput,(LemoFFA.00.250.NTA)

• Nor4575,10meterRPMinputcableBNCtoLemo

Included in the delivery• AcousticcameraarrayNor848A-0.4,frontenddiscwith128microphonesbuildinopticalvideocameraandelectronicinterfacealternativelyacousticcameraarrayNor848A-10,frontenddiscwith256microphonesbuildinopticalvideocameraandelectronicinterface.AlternativelyNor848A-16,frontenddiscwith384micro-phones,opticalvideocameraandelectronicinterfaceandprocessingunit

• On-lineanalysingsoftwarewithrecording,measure-mentandpost-processingfunctions.SuppliedwithBosenoisecancellingheadphonesforoptimumon-linelistening.ReadyinstalledontheMacBook.

• LaptopcomputerMacBookPro.

• MainsadapterNor337/848.

• LAN-cable5m.

• Nor848/case-TransportcasingforAcousticcamerafront-endwithspacefortripodandaccessories.

Options• RPMoptionforanalysingrotatingmachines.

Nor848A 0.4 meter array