Inspection methods laser

A particularly insidious failure mechanism that is commonly found in carbon-steel tubing is under-deposit corrosion. In many cases, corrosion products fomi a scab that can mask the presence of the pitting, making it difficult to quantitatively assess using conventional NDT methods. However, by combining proper cleaning procedures with laser-based inspection methods, the internal surface of the tubing can be accurately characterized and the presence of under-deposit corrosion can be confirmed and quantified. 

The laser-based gun tube inspection systems are intended to augment and, perhaps eventually, replace the labor-intensive, time consuming and subjective visual inspection methods that are currently employed by these facilities. 

General corrosion control, prevention, and monitoring should be planned for from the onset. To detect and monitor corrosion, various methods must be used, while corrosion protection would be done by the addition of inhibition and use of protection coatings [5]. Visual examination, laser methods, the replication microscopy liquid penetration testing method, magnetic particles testing, the eddy current inspection method, acoustic emission technique, thermal methods of inspection, and nondestructive methods are the various methods to be adopted when monitoring pipeline corrosion [5]. 

Another application of laser-based profilometry is the inspection of rocket and missile components. The U.S. Air Force has funded work to develop a non-contact laser-based profilometer for the inside surface of solid rocket motors. Over time, these devices are subject to slumping and cracking, which could potentially render the rocket motor ineffective and hazardous. When fully implemented, this system will provide a meaningful screening method for evaluating the condition of aging rocket motors. 

The potential of this method (in the CO2 mode)(5) is illustrated in Figure 2, where the complete thermogram of an ambient sample is shown. The lower trace represents the CO2 concentration, while the upper curve corresponds to the light intensity of the laser light beam that reaches the detector during the temperature scan. Inspection of the thermogram shows that a sudden... 

In any case, the method has one problem per slice you get minute amounts of protein. This means you have to stain, inspect, glue, and extract many, many slices. Rosamonde Banks needed 13 h (without a break ) to prepare enough protein for a 2D gel. Many doctorate students or TAs would probably not have a similar stamina. The team leaders who want to use the laser adhesive technique as a standard method will have to invest a substantial share of their research money into help-wanted ads in lab journals. 

Although the scale of typical liquid-gas interfaces is large compared to the resolution of many modern characterisation techniques, they are difficult to observe because the surface of interest is situated beneath the drop of the liquid. The method presented here bypasses this difficulty by solidifying the drop and inspecting the surface directly. Slight shrinkage of the drop when it is subjected to the laser beam of the confocal microscope may cause a problem. Earlier works have used a plasticising drop where this is not a problem [15]. However, the benefit of the present method is that it uses a water-based system with a surface tension similar to that of water. 

We introduced the identification of food colors in foods using TLC/scanning densitometry and consider the method to be sufficiently applicable to routine analyses at facilities such as the Centers of Public Health and the Food Inspection Office. Also, we consider that TLC/ scanning densitometry is applicable to the identification of various food additives, drugs, and pesticides in foods. However, TLC/scanning densitometry has a limitation It can be applied only to samples which have chromo-phores in the molecules. Recently, applications of the TLC/matrix-assisted laser desorption ionization time-of-flight mass spectrometry (TOF-MS), TLC/fast atom bombardment and TLC/multiphoton ioniza-... 

Direct assessment gives a possibility for direct mechanical or ultrasonic measurement of pit depth and wall thickness change due to the corrosion. X-ray radiography is used to inspect welds immediately after they are made. This technique can also show stress corrosion cracks and corrosion pits in the weld area, where the coating has failed to seal the metal structure. A promising method of mapping corrosion on the metal surface is the use of laser scanning equipment. 

---