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中北大学信息商务学院外文文献 1 原文：原文： Development of laser diameter measuring instrument Daisuke Knono The measuring diameter instrument is big to the sub laser scanning diameter measuring instrument, the CCD projection diameter measuring instrument, the laser diffraction diameter measuring instrument, and the front two belong to the optical geometry principle, the latter is the use of the optical wave principle. CCD projection diameter measurement instrument, after all limited because of the motor speed and scanning the parallel band not too easy assurance, plus now collimator and CCD technology development, now many companies began using CCD imaging method to measure diameter, at home to Shanghai Euler in this regard done earlier, the light source using longer wavelength infrared light, anti-jamming strong, due to the lack of many mechanical parts, so the device is stable and reliable, but the CCD imaging is the control, accuracy is not so easy to expand, especially large diameter of the measured object, but not too thin, too thin scanning measuring diameter instrument of the same problem. Laser diffraction measuring diameter instrument, using diffraction principle of measurement of thin wire diameter, the technology and first two opposite applies only in small diameter of the filaments, and more detailed the better, because this technique is based on the principle of diffraction and theory only when the wavelength and measured objects similar to or greater than the length to be measured diffraction is the most obvious. According to online inquiries, the current glory in this area is in a leading position, and its products in the measurement of 5um to 300um of the filament is no problem, according to the maximum of its advertising can be measured to 500um. Its accuracy owing to the limitation of standard sample and test environment, now only 0.2um around, but the repeatable accuracy is very high. This is filament diameter measuring instrument of a development direction. 中北大学信息商务学院外文文献 2 In large diameter measurement, according to the data display advertising, now do the market Octavia measuring diameter instrument has been the biggest can measure 400mm, and really Shang Youce diameter instrument by multi-sensor collaborative work can also be measured in diameter and up to 500mm, Shanghai eectrl Electric Co., Ltd. measuring diameter instrument by double optical path edge measuring principle has been implemented 1600mm Max diameter measurement, and to put into application in large-scale pipeline industry. There are two directions in large diameter measurement, a is achieved by means of double lens, but it will sacrifice some of the small diameter measurement range, another is through the realization of the single lens, but such of the lens processing difficulty and quality assurance and cost control put forward greater demand.measuring principle At present, two kinds of non contact measurement methods are commonly used in China, one is the measurement method based on the CCD device, and the other is the laser scanning measurement method. Each of the two methods has its own advantages and disadvantages, let us look at the basic principles of their work. The first measurement principle: CCD size measurement CCD size measurement system is basically composed of CCD image sensor, optical system, microcomputer data acquisition and processing system, we first look at the basic principles of the use of CCD measurement: Linear array CCD parallel light of the basic principle of the non contact measurement: the linear array CCD is arranged in the parallel light path, the measured object is placed in the optical path of the CCD front, shooting CCD light by objects blocking part, so the CCD output signal have a notch. Obviously, the size of the width of the notch and the object correspondence relationship, we use the digital circuit design and computer processing is very easy to get corresponding notches of the CCD pixel number, to calculate the size of the object to be measured. But we are also very easy to found a problem: this method of measurement requirements of the length of the CCD photosensitive area larger than the size of the object to be measured, and the large size of the CCD is very expensive, so must by other methods to achieve the light reception. Basic principles of CCD size measurement Apparently CCD method it has some unique general mechanical, optical, electromagnetic measurement instrument incomparable advantages, which with the CCD itself since the scanning high resolution high sensitivity compact structure characteristics of the exact location of the closely related, which key technology is the optical system design and CCD output video signal acquisition and processing. But there are also many common problems, such as complex structure, cost advantages and shortcomings. Let us look at the following, CCD measurement methods have some shortcomings: (1) received by CCD and then converted into digital signal method, the accuracy of the measurement is limited to the size of the CCD pixel! We know CCD pixel no matter which part receives the light, the received optical signal into electrical signal, which restricts the precision of CCD measurement. Of course, we can also use as far as possible a small CCD pixel, so that the measurement error as far as possible. But 中北大学信息商务学院外文文献 3 we also know that the smaller CCD pixel, the higher the cost of CCD, this is a no way to avoid the spear. (2) at the same time, as we know, CCD photosensitive area is generally 28mm, which directly limits the size of the object being measured, the system model is limited. (3) diffraction, we know that diffraction is an unavoidable problem in precision measurement. And here our CCD pixel is not continuous, is a pixel closely arranged with each other, and due to the diffraction caused by the propagation of light is not a straight line, the results will be very easy to appear a lot of error. Second measurement principles: laser scanning measurement Principle diagram of ZM100 laser diameter measuring instrument Principle diagram of ZM100 laser diameter measuring instrument Laser scanning measuring diameter instrument system sent by laser beam by scanning the polyhedron rotating mirror and a scanning optical system, forming and parallel to the optical axis of the continuous high speed scanning beam, high-speed scanning is placed in the measuring region of the work piece, and by on the work piece on the opposite side of the photoelectric receiving device receives, projected onto the photoelectric photoelectric receiver on the light in the beam scanning work piece interdictions, so through the analysis of photoelectric receiver output signal can obtain data and the diameter of the work piece. In order to ensure the measurement accuracy and reliability, light scanning measurement system must meet the following three b