Research On Application Of Semiconductor Laser In Train Chassis Detection

With the rapid development of railway technology,the technical requirements for train detection have also increased.Traditional manual inspection can no longer meet the testing needs of new trains such as EMU and HSR.Under the high requirements of operating costs and technical quality,the image detection technology scanned by high-speed cameras has increasingly highlighted its advantages.This kind of image scanning technology needs to be equipped with a reasonable light source to meet the sharpness requirements for imaging.At present,LED infrared light products actually have limitations in the clarity and uniformity of lighting.For products that can truly achieve high-definition lighting imaging,infrared semiconductor lasers are the best choice.The semiconductor laser uses a single fiber or fiber bundle to round the beam and homogenize the spot.With hermetically sealed device and dedicated power supply,And through advanced semiconductor temperature control technology to ensure that the product works at a reasonable temperature,product’s life is well guaranteed.For a single high-power semiconductor laser,due to the mode problem,the spot is speckle-like and there is a problem of homogenization.The current common scheme is to use multiple single-tube semiconductor laser modules,which are compressed by optical lenses and overlap light spots.After multiple lasers have complementary light spots,some dark stripes can be brightened to improve uniformity.Therefore,infrared laser light source,mechanical flat and fast camera,to form an infrared image capture system,can be a good realization of the train chassis detection requirements to meet market demand.This article starts with the principle of semiconductor lasers and explains the advantages of semiconductor lasers.By introducing the working principle of the semiconductor fiber-coupled laser module,the advantages of the semiconductor fiber-coupled laser in spot quality are further demonstrated.Secondly,it will start with the requirements of the current light source for the inspection of trains,and compare the advantages and disadvantages of the current mainstream lighting sources,and propose future development trends.Finally,starting with the performance characteristics of semiconductor fiber-coupled lasers,with multi-single-tube semiconductor lasers to obtain superimposed light spots through coupling of small-core optical fibers.Simulation experiments and actual environmental tests are performed to achieve the requirements of uniform light spot,reliable performance,and flexible use.