Diode laser conversion of adhesives using semiconductor diode lasers

2003 ◽  
Author(s):  
A. P. Hoult
Keyword(s):  
Diode Laser ◽  
Diode Lasers ◽  
Semiconductor Diode ◽  
Semiconductor Diode Lasers

Field Monitoring of Gases Using III-V Semiconductor Diode Laser Technology

1998 ◽  
Author(s):  
Hu Wang ◽  
Michael J. Hamp ◽  
Daniel T. Cassidy ◽  
An Nguyen ◽  
Mark A. Fritz
Keyword(s):  
Diode Laser ◽  
Near Infrared ◽  
Diode Lasers ◽  
Telecommunications Industry ◽  
Gas Detection ◽  
Semiconductor Diode ◽  
Laser Technology ◽  
Laser Detection ◽  
Detection Systems ◽  
Semiconductor Diode Lasers

III-V semiconductor diode lasers can be used to make accurate measurements of the concentrations of gases. In this paper the field of trace gas detection using III-V semiconductor diode lasers will be reviewed with an emphasis on suitable applications of this technology in pipeline monitoring. III-V semiconductor diode lasers emit light in the near infrared (NIR) with wavelengths ranging from 1 to 2 μm. Many molecules have absorption lines in this spectral range which makes them contenders for detection with diode laser technology. Molecules relevant to the pipeline industry that can be detected using diode laser systems include H2S, C2H4, C2H2, HF, CO2, CO, O2, NH3, HC1, NO, NO2, HCN, H2O and CH4. Diode laser detection systems may be well suited for many pipeline related applications. Portable field-screening detection systems may be possible, such as hand-held systems which can be used to pinpoint leaks for compressor station inspection. Airborne (∼200 km/h) and mobile (∼40 km/h) systems which can be used for pipeline and urban area inspection may also be feasible. Stationary systems can be integrated into pipeline systems to provide real-time remote gas monitoring for Supervisory Control and Data Acquisition (SCADA) systems. Detection sensitivities of parts per million (ppm) or better are achievable for many gases. A single diode laser detector can be designed to detect more than one gas leading to versatile multipurpose systems. As III-V diode laser based gas detection systems exploit the same technologies as the highly successful telecommunications industry they have the potential to be low in cost, reliable, and easy to operate and maintain. We will present an overview of state-of-the-art III-V diode laser detection systems. System performance will be evaluated and the usefulness of these types of detection systems will be demonstrated.

Pulsed Semiconductor Diode Lasers as an Environmentally Efficient and Affordable Decoating Method for Shipbuilding and Ship Maintenance

2003 ◽  
Vol 19 (03) ◽  
pp. 165-178
Author(s):  
Frederick A. Lancaster
Keyword(s):  
Diode Laser ◽  
Diode Lasers ◽  
Surface Preparation ◽  
High Energy ◽  
Semiconductor Diode ◽  
Layer By Layer ◽  
Semiconductor Diode Laser ◽  
Semiconductor Diode Lasers ◽  
Ship Maintenance ◽  
Coating Removal

Coating removal during new ship construction or ship maintenance has traditionally posed environmental and production issues. Coating removal results in a large amount of waste, and other trades cannot work in or near areas where coating removal operations are going on. Hydroblasting, an environmentally friendly method, has significantly decreased in recent years; it cannot be used on interior compartments. The dilemma has been to find a surface-preparation method that is effective yet environmentally acceptable and one that can work on the outer hull as well as on the inside compartments. Further, a method is needed to remove coatings from the new "soft" substrates. Laser devolved over the years from expensive CO2 and Nd:YAG lasers to the recent innovation of using affordable semiconductor diode lasers for coatings removal. Semiconductor diode laser decoating is a nonintrusive, nonkinetic energy process that has successfully removed coatings from a variety of substrates, such as composites, fiberglass, metal, and plastics, in a controlled manner, layer by layer, without damage, leaving the surface ready for immediate repainting. The process is very rapid (up to 400 sq ft per hour), 6 to 10 times faster on average than the present manual hand-sanding methods, and involves a minimal increase in temperature, because the energy is mostly absorbed and utilized in coating decomposition (i.e., instant pyrolization and evaporation). The only waste associated with this process is the ablated coating that is vacuumed from the surface and captured in particle filters, approximately one-third of the amount of coating originally on the surface. Diode lasers are compact, durable for shipbuilding and repair industry use, and present low operating costs. Due to delays in receiving test panels from Navy and commercial ship sources, this paper will highlight data from tests of removal of coatings similar to military epoxy/polyurethane coatings from thin-skin metallic, composite, and fiberglass structures, radome material, and for removing powder coatings. Pulsed high-energy diode laser decoating technology is now commercially and economically available for ship corrosion control and maintenance, can reduce the overall environmental impact of decoating, and can increase productivity of all the ship trades.

Modulation Properties of Self-Injected Quantum-Dot Semiconductor Diode Lasers

2013 ◽  
Vol 19 (4) ◽  
pp. 1900812-1900812 ◽  
Author(s):  
F. Grillot ◽  
Cheng Wang ◽  
N. A. Naderi ◽  
J. Even
Keyword(s):  
Quantum Dot ◽  
Diode Lasers ◽  
Semiconductor Diode ◽  
Semiconductor Diode Lasers

Peer Reviewed: Semiconductor Diode Lasers in Atomic Spectrometry

1996 ◽  
Vol 68 (11) ◽  
pp. 351A-356A ◽  
Author(s):  
Kay Niemax ◽  
Aleksandr Zybin ◽  
Christoph Schnürer-Patschan ◽  
Henning Groll
Keyword(s):  
Diode Lasers ◽  
Atomic Spectrometry ◽  
Semiconductor Diode ◽  
Semiconductor Diode Lasers
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