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From close to the wavelength of the size of micrometers, decimeter to several meters in the shape of objects, very close, a few kilometers to tens of kilometers from the target, even as large as the distance between the satellite and the Moon and Earth, with a laser accurate measurement in different ways and technology of semiconductor laser diode LD technology matures in the 1980s, began to be used, the short-ranging radar, it has a small size, light weight, simple structure, easy to use, eye-safe, low the value such as a series of advantages, the nineties began to vigorously develop the LD laser radar, short-range laser radar applications, the trend to replace the YAG laser radar in recent years, the development of a portable.
In short, the progress of those experimental results, in other words, to point out here that the assessment of the mechanical and metallurgical properties of welded structures studied welding conditions and chemical composition of tailor-welded weld toughness. Figure 5 - (a) through the thickness of the transition temperature of the weld welding model to determine the ductile-brittle transition behavior; (Fe306) in the given welding conditions. (B) The ductile-brittle transition behavior of welded joints by welding model identified; (IF-Ti, t = 0.8mm) in the case of welding conditions given sample structure (base metal, heat affected zone and weld) ductile-brittle transition temperature. By the welding of ductile-brittle transition behavior model to determine the weld; HR, Q = 5.5kW), welding speed and the influence of thickness on the ductile-brittle transition temperature. Because the battery of cell phone jammer is recyclable to avoid the battery waste and environment pollution.
Figure 6 (a) Fe360 steel and low temperature experiments the surface of the organizational structure currently displayed in the gap section of the fracture morphology. The tissue surface distribution of the uniform size of the ferrite. Fracture the specimen smooth, fracture mode was ductile fracture at high temperatures. This is a typical result, shown in Figure 6 (b) in the IF-Ti steel test sample performance of intergranular fracture, some specimens in the cleavage plane was broken, on the parent material can also see two times branched intergranular fracture. The surface of the organizational structure on the left after impact fracture experiments. (B) IF-Ti steel microstructure, surface organizational structure on the left after impact fracture experiments. (C) (d) (e). And at the same time, these kinds of batteries of cell phone jammer are not very easy or convenient for the customer to get.