Non -Contact Ultrasound WOOD AND LUMBER · PDF file · 2017-05-16 Non -Contact Ultrasound WOOD AND LUMBER ANALYSIS Application Note AN-305-3 SecondWave™ M510 Ultrasonic Analysis

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Non-Contact Ultrasound

WOOD AND LUMBER ANALYSIS

Application Note AN-305-3

SecondWave™ M510 Ultrasonic Analysis System

Non-Contact Ultrasound: Wood and Lumber


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3100 Research Drive, State College, PA 16801 USA

Ph: +1.814.861.2001 Fax: +1.814.861.2045

www.ultrangroup.com

SecondWave™ M510 shown with single and multi-channel transducers on different materials

Introduction

Contact or water immersion ultrasound does provide

significant information about materials quality and

properties. But, it cannot be applied to the early stages

of materials formation - when they are tacky or fragile.

It is also not reliable for materials that are porous, liquid

sensitive, or when any type of contact with a material is

cumbersome. Non-Contact Ultrasound (NCU) is the

most desirable choice for such applications.

Ultran has been working to facilitate NCU since 1978. In

1997, Ultran created internationally patented

piezoelectric transducers characterized by phenomenal

efficiency in air and other gases with frequencies from

50 kHz to 5.0 MHz. Complementing the NCU

transducers are Ultran’s equally novel ultrasonic imaging

systems and analyses software. The SecondWave™

M510 is a focused non-contact ultrasonic analysis

system that is customer-friendly and understands the

significance of materials testing and analysis, including

the speeds required to accomplish a task.

The M510 supports through transmission, same-side

and pulse-echo techniques. M510 single and multi-

channel systems have been fully configured and

installed for on-line (production line) and off-line (bench

top) QC analysis of wood, lumber, Oriented Strand

Board (OSB), particle boards, light weight wood foam

cores, veneer, laminates, etc.

M510 Capabilities

Moisture estimation

High resolution detection of knots and other conditions

in lumber

Density/porosity, texture, and mechanical properties

Through transmission and same side testing

SecondWave™ M510 Components

NCU Transducers

Ultran’s transducers boast the highest efficiency devices

among non-contact transducers – approaching those of

conventional contact transducers. Frequency Range: 50

kHz - 5.0 MHz. Active dimensions: 1.0 mm - 500mm.

with planar, point, parabolic, and compound beam

geometry. Robust lightweight construction.

Scanning: Vertical or horizontal acoustic bench, single or

multi-transducer multi-axis scanning frames.

System Instrumentation

4U industrial grade unit incorporating Intel Core2 Quad

processors, 2 GB RAM, RAID5 Serial ATA hard drives and

redundant power supplies. Integrated are:

Pulser: PCI-based 375V RF toneburst pulser with 50 kHz

to 5 MHz range, adjustable bursts, voltage and PRF.

Receiver: Internal 1-8 channel low-noise amplifier with

80 dB gain and 10 MHz bandwidth, multi-value low and

high pass filters.

DAQ: 14 bit Analog to Digital Converter with 50 MHz

sample rate and on-board 256 MB storage. Multi-axis

encoder inputs for motion synchronized acquisition.

Software

SecondWave™ Studio: Windows XP-based A-Scan and

C-Scan software with user-friendly GUI. Displays rolling

single and multi-channel C-Scans. Capture and storage

of full-wave data for scans. Project Manager with

multiple access levels. SQL Database integration.

SecondWave™ Research Studio: C-Scan and A-Scan

post-processing software. Generates cross-sectional

material profiles. Parametric correlation to determine

material density, porosity and fiber orientation. Image

processing functions to find and highlight defects.



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Ph: +1.814.861.2001 Fax: +1.814.861.2045

www.ultrangroup.com

Non-contact ultrasound techniques

Direct transmission

Same side transmitter-receiver – pitch-catch

T R

Longitudinal/Shear

Waves

Surface WavesAIR

Single transducer – pulse-echo

AIR

Quantitative detectability example

Defect, crack, delamination detection

Velocity, time-of-flight, thickness measurements

Oblique incidence & refraction for shear wave and

anisotropy measurements

Defect, delamination,

corrosion detection

Location of discontinuities

Surface profiling

Surface acoustic analysis

Reflectance measurements

Depth measurement

Object identification

Air + Test

Material

Transmission

Surface

Reflections

Thickness

Reflections

Detection of side drilled holes (varying

from 0.5 to 6.3 mm) in 10 mm PMMA

with direct NCU transmission – 1.0 MHz

Ultrasonic reflection image

AIR

T

R

AIR



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Ph: +1.814.861.2001 Fax: +1.814.861.2045

www.ultrangroup.com

Observations and case studies by direct transmission and same side NCU imaging (All images generated without signal post-processing, and in most cases no signal averaging was used)

Wood – defects, chemical treatment, moisture, etc.

0 hr 2 hr 6 hr 24 hr

Fig. 4. 19 mm oak as a function of moisture content. Observe, as the moisture time increases so does the

ultrasound attenuation.

Oriented Strand Board (OSB) – defects and moisture content – figures 5 to 7

Fig. 1. 100

mm pine

across grain.

140 kHz

Fig. 2. 100

mm pine

along grain.

140 kHz

Fig. 3. 19 mm

treated (left) and

untreated (right)

wood.

140 kHz

Fig. 5. Good

quality OSB.

140 kHz

Fig. 6. Poor quality OSB

that resulted in

catastrophic failure.

140 kHz



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Ph: +1.814.861.2001 Fax: +1.814.861.2045

www.ultrangroup.com

Fig. 7. OSB as a function of moisture content. Observe, as the moisture time increases so does the ultrasound

attenuation.

Particle board – defects and particle density – Fig. 8

Plywood – defects and disbonds – Fig. 10

Fig. 8. 15 mm particle board with small variation in texture. 500 kHz

Fig. 9. 13 mm very light wood foam core.

1.0 MHz

Fig. 10. 19 mm plywood.

140 kHz

Very light wood foam core – texture

and density variations – Fig. 9.



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Ph: +1.814.861.2001 Fax: +1.814.861.2045

www.ultrangroup.com

Conclusions

Ultran’s SecondWave™ M510 ultrasonic imaging and

analysis system is characterized by a wide range of

frequencies from 50 kHz to 5.0 MHz. This makes it

possible to apply non-contact ultrasound (NCU) for

concrete products all the way from early stages of

their formation to finished products. Typical

applications include QC analysis of wood, lumber,

Oriented Strand Board (OSB), particle boards, light

weight wood foam cores, veneer, laminates, etc. The

M510 is a powerful tool for materials process analysis

and QC, directly saving you cost, energy, and

materials, besides assuring the quality and reliability

of your materials.

What Ultran provides

We supply complete NCU systems suitable for

customers’ needs. These include specifically

designed transducer libraries so that our customers

can start characterizing all their materials from Day 1.

Ultran also supplies custom NCU systems geared for

production (online) configured to customers’

applications and environment of testing.

Under agreements, Ultran will transfer science and

technology - targeted to customer needs. We offer

hands-on training to all our customers.

We maintain a fully-stocked ultrasound materials

analytical laboratory and we are fully equipped to

provide feasibility, in-depth analysis, and R&D for our

customers.

Sales representatives

HEAD OFFICE

The Ultran Group

3100 Research Drive

State College, PA 16801 USA

Tel: +1.814.466.6200

Fax: +1.814.466.6847

Email: [email protected]

ITALY

Pierluigi Carni

Via B. Angelico, 1

24047 Treviglio – BG, Italy

Tel: +39 340 9125410


UK

Sonatest NDTS

Jenny Hough

Units 1-3 Prospect House, Colliery Close,

Ireland Business Park,

Staveley, Chesterfield, S41 8NG, UK

Tel: +44 (0) 1246 474269

Fax: +44 (0) 1246 474089


JAPAN

Ken Automation

Tatsuya Yaoita

Hiranuma 1-11-12

Yokohama KMH Bldg., Nishi-Ku

Yokohama - 220-0023

Tel: +81.45.290.0432

Fax: +81.45.321.6590


CHINA

Matrix U/E Technologies Inc.

Jiang Yunxi

Chaoyang District, Beijing Wangjing Litse emerging

industries in Park District No. 106 Building 402B

Tel:+86-10-64391208-819

Mobile: 0086-13910978697

E-Mail: [email protected]

INDIA

Simon Amallraja

President - SMD

PET Aviation Systems P Ltd.

Mobile: +91 98663-43309, +91 98480-43309

Tel: +91-40-2370-2840, Fax: +91-40-2370-2837


Documents

Non -Contact Ultrasound WOOD AND LUMBER · PDF file · 2017-05-16 Non -Contact Ultrasound WOOD AND LUMBER ANALYSIS Application Note AN-305-3 SecondWave™ M510 Ultrasonic Analysis