noise monitoring stations january, 2011 canada environmental noise seminar dalimar instruments
TRANSCRIPT
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Noise MonitoringStations
January, 2011Canada Environmental Noise Seminar
Dalimar Instruments
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Installation Checklist
• Portable, Semi-Permanent or Permanent• Power – AC or battery w/solar• Meteorological Sensors• Communication• Ease of service• Security
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Portable Installations• Watertight case with batteries
– (1-2) 21Ahr batteries– (1) 100Ahr battery
• Tripod• Microphone protection shroud• Extension cable• Software• Security Chain / Padlocks
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1 Week Unattended Monitoring
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Permanent Installations
• Outdoor microphone/preamplifier• Automated calibration via actuator• Heavy duty mount• Weather sensor integration• Solar charging option• GPS time sync• Remote communication• Security
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Outdoor Microphone
• Designed for reliable long-term operation
• Free Field or Random Response• Remote calibration via
electrostatic actuator• Bird spikes, rain hat and UV
treated windscreen• Internal temperature and
humidity sensors**• Window to view desiccant
condition
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Electrostatic Actuator• Daily check on NMS operation• Voltage applied to diaphragm
of microphone (simulates SPL)• Output of microphone
compared against reference value
• Automated at quietest time of day
• Calibration history stored
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Mounting – Semi Permanent
• Heavy Duty Steel Tripod• Up to 20’ Microphone Height• Adapts to un-even ground• Guy wires to secure against
high winds• Feet staked to ground• Adapters for weather sensors
and solar panel
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Mounting – Permanent• 17’ Tilt-Down Pole• Mounted to concrete pad• 20’ Microphone Height• Adapters for weather sensors
and solar panel
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Ease of Service
• One man operation• Tilt-down pole for
calibration and service of outdoor microphone
• Desiccant condition viewing window
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Inside the Enclosure
• Sound Level Meter can be easily swapped for service
• 831-INT – acts as a docking station
• Ease of access to cables and connections
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831-INT Docking Station• Inputs for wind speed and
direction• Logic I/O• Powered USB hub• AC power input• Solar charging input• -ET Version (LAN)
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NEMA Enclosure
• Protects against environmental elements
• Fiberglass construction – allows passage of wireless comm
• Allows viewing of SPL and data AT SITE
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Security
Lock on tilting mechanism on TRP019 Pole
EPS033 Security Lock on EPS031 or EPS032 enclosure
Specially licensed security screw for EPS031 and EPS032
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Weather Sensor Integration• Temperature / Humidity• Wind Speed & Direction• Rainfall
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Why Measure Wind Speed & Direction?• Wind speed increases with altitude• Sound is “focused” on downwind side and “shadowed” on
upwind side of source• Distances < 50m, influence is negligible• Measure downwind for least deviation
Courtesy of B&K
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Combined Weather Sensors
• Ultrasonic Wind Sensor
• Temperature and humidity
• Rainfall and Hail
• Barometric pressure
• USB connection to 831
• Data integrated in 831 logging data
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Why Measure Temperature?• Temperature gradients create effects similar to wind
gradients.• Uniform in ALL directions• Temperature inversions “focus” sound on ground surface
Courtesy of B&K
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Logging Meteorological Data• Parameters “logged” in Time History• Min/Max/Average values stored in each Interval
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Solar Charging• Ideal for remote locations – no need to run power• Solar panel charges large battery (typically stored
underground)• Multiple size solar panels depending on climate
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Battery and Panel SizingBattery• Compute power consumption• Verify max cloudiness - # of days without charging• Check low temperature
Solar Panel• Determine Low-Insolation worst case• Choose solar panel size• How fast will panel charge battery if depleted
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Communication Options• Direct – USB, USB extender + intranet, RS-232• Analog Modem• Wireless Model (EDGE)• ADSL
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USB Extenders / Intranet• USB Extender
60m / 150 ft– IOgear GUCE51– CablesToGo Super
Booster100m / 328ft
– ICRON USB Ranger 110• USB Intranet Hub
– Digi AnywhereUSB
Alternatives• Long microphone extension
cable and keep 831 close to PC
• Long extension cable from outdoor preamplifier to Sound Level Meter (up to 500’)
• Power microphone and preamp with external supply, long direct voltage input into Sound Level Meter
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RS232 Serial port• CBL117 Null modem to PC• DVX008A to 831 Host port• Speed
– 4.5 Kbytes/s at 115200– 3.5 Kbytes/s at 57600
• Wireless RS232– 2 modems– RF Modem– CDMA
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Analog Modem• Analog Modem (MDMUSB-A)• POTS line (plain copper end
to end)– No VOIP compression
• Speed– 1.5 to 4.5 Kbytes/s
• Call from modem in PC– Same “sound” as fax
• Software– SLM Utility-G3– DNA / DNA Remote
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Wireless Communication
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Wireless Modem• MDMUSB-E
– GSM SIM Card– GPRS / EDGE technology– Data plan
• Email program with MAPI– Eg MSOutlook or MS
Outlook Express• TCP/IP port number
– Robust, error checking• Speed
– 2 Kbytes/s
• No calling from analog or other wireless modem
• SMS via wireless when provider does not support SMS, but MMS via mail
• SMS manually – test at installation
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(A)DSL / (W)LAN / 3G Ethernet• 831 Docking Station with Ethernet port
– (A)DSL connection– 3G Modem– LAN or WLAN
Leverage standard technology• Speed
– 50-70 Kbytes/s• Applications
– Faster transfer speeds (large files)– Live streaming
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Automated Downloading• DNA Remote module supports multiple connections –
analog/wireless/direct• Can connect to multiple stations simultaneously• User selectable download time• Each file tagged with S/N of instrument
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Software Options• Download Utility – G3
– Manual connection– Excel export utility– ScreenGrabber
• Advanced - DNA– Real time graphing software– Post processing of data– Automated downloading of data from NMS (remote)
• Airport – ITT / ERA AirScene– Remote hosting of data– Ability to sync noise data with radar tracks– Complaint module
• SDK (Software Developer Kit)
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Conclusions
• Environmental protection / security• Critical Questions
– Battery Life– Power Supply
• Multiple Communication Options leverage current technologies
• Software – manual to fully automated operation