airstar-presentation forestry (3)
TRANSCRIPT
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ULTRASONIC TESTING OF
FORESTRY PRODUCTS
JAN STRYCEK
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AIR-COUPLED ULTRASOUND
Challenges and History
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CHALLENGES OF AIR-COUPLED ULTRASONICS
REFLECTION LOSSES
♦ SPECIMEN : 60 - 90 dB
♦ TRANSDUCERS: 90 dB
♦ TOTAL REFLECTION LOSSES: 180 dB
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METHODS FOR AIR-COUPLED ULTRASONICS
♦ High Ultrasonic Pressure
♦ Impedance Matching Layers
♦ High Voltage Transducers
♦ Toneburst/ Resonant Transducers
♦ Low Noise Pre-Amplifiers
♦ Digital Filters
♦ High Sensitivity
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TRANSDUCER CONFIGURATIONS
TWO SIDED INSPECTION
longitudinalwave
shearwave
platewave
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TRANSDUCER CONFIGURATIONS
ONE SIDED INSPECTION
pseudo pulse-echo plate wave
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DEVELOPMENT AND HISTORY
Hp. Loertscher, B. Grandia, J. Strycek, W.G. Grandia:Airscan Transducers, Technique and Applications.
NDT net, Sept. 1996
J. Strycek, W.A. Grandia, Hp. Loertscher:Wave Modes Produced by Air-coupled Ultrasound.
NDT net, May 1997
J. Strycek, Hp. Loertscher:Ultrasonic Air-coupled Inspection of Advanced Material.
NDT net, Dec. 1999
J. Strycek, Hp. Loertscher, et.al:High Speed Large Area Scanning Using Air-coupled Ultrasound.
15th WCNDT 2000 Roma, NDT net 2000.
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DEVELOPMENT AND HISTORY
Our First Instrument for Air-coupled Ultrasound 1986
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AEROSPACE APPLICATIONS
ARIANE AND CHANDRA
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AEROSPACE APPLICATIONS
F22 AND B-2
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AEROSPACE APPLICATIONS
HIGH SPEED LARGE AREA SCANNER
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AEROSPACE APPLICATIONS
HIGH SPEED LARGE AREA SCANNER
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INDUSTRIAL APPLICATIONS
FOAM SCANNER
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SOLID LUMBER
Eucalyptus and Radiata Pine
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RADIATA PINE
Air-Coupled Ultrasonic C-scan
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EUCALYPTUS
Air-Coupled Ultrasonic C-scan
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SOLID LUMBER CRACK DETECTOR
2 CHANNEL LINEAR
SCANNER
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SOLID LUMBER CRACK DETECTOR
High speed scanner
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16 CHANNEL CRACK DETECTOR
SOLID EUCALYPTUS LUMBER
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16 CHANNEL CRACK DETECTOR
TRANSDUCER AND INK
MARKING
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BLOW DETECTORS
FRAME WITH TRANSDUCERS
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BLOW DETECTOR
12 CHANNELS WITH THICKNESS GAUGES
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BLOW DETECTOR
CABINET, PNEUMATICS, ELECTRICAL BOX
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BLOW DETECTOR
TESTING LVL BILLETS
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BLOW DETECTOR
LVL 3.5 INCH THICK
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BLOW DETECTOR
LVL 16-CHANNEL
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BLOW DETECTOR
LVL 16-CHANNEL
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BLOW DETECTOR
PLYWOOD 32-CHANNEL
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BLOW DETECTOR
PLYWOOD 32-CHANNEL
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BLOW DETECTOR - FEATURES
♦ High Reproducibility
♦ High Signal to Noise Ratio
♦ Specifically adapted Noise Filters
♦ Works close to Ripsaws
♦ Works close to Press
♦ Suitable for very harsh environments
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BLOW DETECTOR - FEATURES
♦ Low Maintenance
♦ User friendly interface
♦ Robust Ceramic Transducers
♦ Non contact Laser Encoders
♦ Remote maintenance
♦ Cluster defined Blows
♦ Auto-Calibration and Gain Control
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BLOW DETECTOR - FEATURES
Standard and New Receiver Cards at min. Gain
LVL 3.5 inches
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CLUSTERS
♦ TILE
♦ CLUSTER
Area for which the ultrasonic signal is tested and marked as accepted or rejected
Each channel represents one column of tiles, typically 1 inch long
Several rejected tiles can be defined to be connected in various ways
The size of a cluster is defined by the number of connected tiles
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CLUSTERS
VARIOUS ENSEMBLES OF TILES
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CLUSTERS
♦ INK MARKING
Clusters which include the minimal number of rejected and connected tiles are rejected
Rejected clusters are marked by ink on the test part and entered into the database
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BLOW DETECTOR - INSTRUMENT
EACH CHANNEL: 1 PULSER + 1 RECEIVER
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BLOW DETECTOR - CABINET
MONITOR, INSTRUMENT, PC,
ELECTRICAL PANEL
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BLOW DETECTOR - CABINET
CABINET COOLER
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BLOW DETECTOR - MONITOR
BILLET MAP, MARKED CLUSTERS, THICKNESS
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BLOW DETECTOR - SOFTWARE
ADMINISTRATION
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BLOW DETECTOR – CALIBRATION
TESTING CALIBRATION STANDARD
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BLOW DETECTOR - CALIBRATION
CALIBRATION STANDARD
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BLOW DETECTOR – CALIBRATION
CALIBRATION STANDARD IN PLACE
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BLOW DETECTOR - CALIBRATION
ON CALIBRATION STANDARD
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BLOW DETECTOR - PNEUMATICS
FOR AIR KNIVES
AND MARKING
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BLOW DETECTOR – PERIPHERALS
TRANSDUCERS WITH AIR KNIFE
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BLOW DETECTOR - PERIPHERALS
AIR KNIFE AND SHEAR PLATES
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BLOW DETECTOR – PERIPHERALS
DYE SPRAYS AND THICKNESS GAGE
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BLOW DETECTOR – PERIPHERALS
DYE SPRAYS AND THICKNESS GAGE
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BLOW DETECTOR – PERIPHERALS
LASER THICKNESS GAUGES
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BLOW DETECTOR – PERIPHERALS
LASER THICKNESS
GAUGES
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BLOW DETECTOR – PERIPHERALS
LASER THICKNESS
GAUGESAND
AIR KNIVES
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BLOW DETECTOR – PERIPHERALS
NON CONTACT LASER ENCODER
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BLOW DETECTOR – PERIPHERALS
INFRARED TEMPERATURE SENSOR
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BLOW DETECTOR – RESULTS
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BLOW DETECTOR – RESULTS
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BLOW DETECTOR
INVESTIGATING TRANSDUCER SPACING
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R & D
PLYWOOD STANDARD FREQUENCY
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R & D
PLY WOOD MEDIUM FREQUENCY
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R & D
PLYWOOD HIGH FREQUENCY
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INSTRUMENTS