microflown - a new category of sensors
TRANSCRIPT
Introduction
Company Introduction1994: Invention Microflown by Hans-Elias de Bree at University Twente
1997: Ph.D. Hans-Elias de Bree
1998: Founding Microflown Technologies B.V. (de Bree, Koers)
2001: Industrializing product
2003: Introduction broad banded sensor element
2004: First applications scientifically proven / first arrays sold
2005: Rapid growth in (automotive + aerospace) industry
2005: De Bree appointed Professor ‘Vehicle Acoustics’ at the HAN University, Arnhem School of Automotive Engineering
2008: Strategic decision to explore the defense & security market
2010: 20 FTE company, 2 MEURO turnover
Company Introduction• Main markets Microflown is focusing on are Automotive, Aerospace and
Defense• 2 million euro turnover• Rapidly growing company• Own faculty at the Han University of Automotive engineering in Arnhem• Within total of 20 FTE employed, we count:
• Two professors• Two more PhD• Two academic engineers• Eight engineers a higher vocational level• Five EU nationalities (Dutch, German, Italian,Scottish, Spanish)
ReferencesAutomotive - OEMAudi, BMW, DAF Paccar, Daimler, Ford, Freightliner, Harley Davidson, Honda, Isuzu, Mazda, Nissan, PSA Group ( Peugeot - Citroën ), Renault Samsung, TATA, Toyota, VolkswagenAutomotive - OthersAISIN, Behr Group, Eaton USA, Faurecia, Fontijne Grotnes, Harman Becker Automotive Systems, ISM Automotive, Jatco, Mirror Controls International, Mitsuba, Rieter Automotive, Rietschle Thomas, Robert Bosch, Siemens VDO, StankiewiczAerospaceAirbus France, Airbus Germany, DLR ( German Aerospace Center ), General Electric Propulsion Systems, Progency Systems Corporation
ReferencesDefense & SecurityAeronautical Development Establishment Bangalore, Batelle, BBN, Dutch Ministery of Defense, University of the Federal Armed Forces ( Germany), Naval Post Graduate School, Wehr Technische DienstTest housesLMS International, Mueller-BBM, Ricardo UK, SPEKTRAOther IndustriesASML, BOSE, CAE Engineering and Services, Canon, CNAM, EMPA, Fisher-Rosemount, INRS, INSA, KAZ, KNMI, Kobe Seitetsusyo, MSX International, Nippo Hoso Kyokai, Oticon, Pioneer, RION, Sick Maihak, Sony
Microflowns
Working principleMicrophone measures sound pressure (result)
Microflown measures Particle Velocity (cause)
Acoustical <-> electrical <-> energySound pressure <-> voltage <-> potentialParticle velocity <-> amperes <-> kinetic
Working principle
PRESSURE WAVEPRESSURE WAVE
Working principle
PRESSURE WAVE PRESSURE WAVE ≠ ≠ PARTICLE VELOCITYPARTICLE VELOCITY
Working principle
Microflown SEM picture: two heated wires
Working principle
ou tpu t
T[k
]velocity
d is tance 0
u pstream d ow n stream
Working principle
Working principleSurface velocity measurement:• No background noise and reflection problems
Figure of eight High surface velocity and low surface pressure
Low surface velocity and high surface pressure
Working principle
Mems based sensorClean room technology is used to create the small elements on a waver
University of Twente
Working principle
Wirebonded elements
Standard probes
Scanning Probes• 1D Velocity• For small object• High temperatures• Non contact vibration
Standard probesPU probes• Particle Velocity• Sound Pressure• 1D Sound Intensity• 1D Sound Energy• Impedance
Standard probes
PU Probes: Placement of p and u
Standard probesMetal Mesh• Wind shield, DC
flow up to 2 m/s• Protecion of the
wires• Calibration
including mesh
Standard probes Array applications: From product development till end of line control
Standard probesUSP probes• 3D Particle Velocity• Sound Pressure• 3D Sound Intensity• 3D Sound Energy• Impedance• Acoustic Vector Sensor
Standard probes
3D Sound Chip
Standard probesApplication examples• Hostile fire localization• Air to ground applications (PGM, UAV’s, etc.)• Border control (passive, unattended ground sensor node)• Passive surveillance (also in urban environment)• Environmental monitoring• Etc.
Standard probes
Standard signal conditioner
Standard probes
Standard signal conditioner• Powering the sensor• Option for hardware correction• High or low gain setting
Standard probesHigh dB Scanning Probe• Above 135dB acoustics becomes non linear• Standard sensor overloads at 130dB• Measurement at 170dB is possible with packaged sensor
Calibration
CalibrationStanding Wave TubeLoudspeaker on one side, reference pressure microphone at the other sidein the tube, known relation between pressure at the end and pressure and velocity in the tube
Reference microphone
loudspeaker
PU probe
Standing wave <->
CalibrationPiston on a SphereKnown relation between sound pressure and particle velocity in front of the speaker.Use a reference pressure microphone to calibrate the Microflown probe.