Laser-based ultrasound for remote and limited access applications

McKie, A. D. W.; Addison, R. C.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p239
Academic Journal
The ability to quickly and directly manipulate flexible low mass optical fibers equipped with specialized endoscopic scanning optics make fiber systems an attractive method for the development of limited and remote access inspection systems. Previous work has shown that a promising approach for the implementation of a fiber-based inspection head is based on the use of a Cassegrain optical collection system. However, the successful implementation of a fiber-based remote and limited access LBU inspection system is reliant on two key factors. First, the capability to efficiently and robustly deliver the high peak-power generation and detection laser beams via fiber optics to the part under test must be established. Secondly, the scattered light from the part must be collected and efficiently coupled to the optical interferometer system via optical fiber. The selection of the generation and detection lasers is a critical step in the process of optimizing the LBU system signal-to-noise ratio. To maintain the ability to operate the remote scan head at distances of tens of meters from the lasers at a reasonable cost, the lasers selected must be transmitted efficiently over a standard quartz optical fiber. The latter requirement eliminates the use of a pulsed CO[sub 2] (λ=10.6 μm) generation laser which has been routinely used for inspection of composite materials using LBU. Investigations have been performed using Q-switched alexandrite (λ=720–800 m) and Nd: YAG (λ=532 nm) lasers which are both compatible with transmission through long lengths of optical fiber. However, one potential problem with the Q-switched Nd: YAG laser is that the high energy generation-laser pulses may cause catastrophic failure of the delivery optical fiber at relatively low incident energy levels. The longer pulse duration of the alexandrite laser allows for delivery of pulse energies >65 mJ, but the ultrasonic generation efficiency with this laser is somewhat ...


Related Articles

  • Application of phased array in inspection of nozzle welds of high thickness reactors manufactured by GE oil & gas Massa plant. Zappavigna, G. // Insight: Non-Destructive Testing & Condition Monitoring;Sep2007, Vol. 49 Issue 9, p521 

    The article reports on the ultrasonic inspection of the nozzle welds, used in the Massa gas plant, using the phrased array technique, in accordance with the requirements of Code Case 2235. For the inspection a special scanner containing a probe holder and an encoder for recording the position...

  • Laser scanner replaces template and reduces costs. Knittel, Jud // Laser Focus World;May2000, Vol. 36 Issue 5, p279 

    Deals with inspection efficiency and overall accuracy through the replacement of templates for automobile-seat inspection with a laser scanning approach. Seat inspection through templates; Optoelectronic approaches; Benefits of laser inspections.

  • Laser Scanning Savings.  // Foundry Management & Technology;Feb2008, Vol. 136 Issue 2, p24 

    The article presents a case study the tooling costs of Grede Foundries Inc.'s laser scanning. Grede Foundries is operating eight ferrous foundries and maintains a tool inventory with its valuable resources. The patterns creating these molds are regularly checked by inspectors using coordinate...

  • Produce 3D scans with sub-micron resolution. Jordan, John M.; Bradbury, Johanna L. // Modern Machine Shop;Jun98, Vol. 71 Issue 1, p244 

    Introduces CyberOptics Corporation's CyberScan non-contact inspection system. Uses of the system; Features and capabilities.

  • Weapons for Flexible Inspection. Koelsch, James R. // Quality;Jun2004, Vol. 43 Issue 6, p32 

    Features the multisensor coordinate measuring machines (CMMs). Mechanism of the multisensor CMM; Identification of classes of probes or scanners for quick measurement of the forms and other features; Measure of openness of CMMs. INSET: TECH TIPS.

  • A Dynamic Way to Scan.  // Quality;Sep2004, Vol. 43 Issue 9, p26 

    This article focuses on the coordinate measuring machine's scanning performance. Scanning induces inertial forces, which result in measurement errors if left uncorrected. Scanning is different than touch-trigger probing in that the machine's dynamic performance is more important than the static...

  • A Laser Scanning System for the Inspection of Fasteners in Railways. ZHANG, H.; TAO, W.; LIU, M.; ZHAO, H. // Lasers in Engineering (Old City Publishing);2013, Vol. 24 Issue 3/4, p229 

    With the rapid growth of high-speed railways, the demand for automatic railway inspection, including fastener inspection, has increased. Most studies related to fastener inspection have focused on image processing and recognition technologies, which entail high computational costs and make...

  • Laser scanner helps define part profiles. Schuster, C. Martin; Thoreson, Robert // Vision Systems Design;Sep2003, Vol. 8 Issue 9, p24 

    Deals with the use of coordinate-measurement machines (CMM) with laser scanners in the improvement of reverse-engineering task of measuring a complex-shaped part in manufacturing industries. Accuracy of such tools in measuring surfaces; Limitations of CMM; Benefits of retrofitting CMM with...

  • X-ray inspection system.  // Manufacturers' Monthly;Dec2005, p44 

    The article features the Autopac X-ray inspection system from Autopac Systems and offers information on the distinct features, design, physical description, specifications and industrial applications of the product.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics