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Optical detection of fitting a common approach

83; and IPD are generally not exactly equal, the geometric center of the frame is not the position of the pupil, the actual detection line in the box only to find the frame in the graph paper at the geometric center of the bridge of the nose, which points in the horizontal direction extension of the left and right, respectively, 1 / 2 IPD determined by the distance between two points is to the left and right position of the pupil, and then around the lenses were measured in the optical center of eye pupil in the horizontal direction and the distance can be obtained by optical poor level of inter-center values. Optical center for the characterization of the relative deviation from the direction of eye pupil, we can specify the location of the eye pupil basis points, the geometric center of the optical center to the distance from nose to nose,[link widoczny dla zalogowanych], eye pupil larger than the distance between the geometric center (ie,[link widoczny dla zalogowanych], the relative eye pupil optical center outwards side),[link widoczny dla zalogowanych], the difference between the optical center of the level of interaction is positive,[link widoczny dla zalogowanych], whereas the level of each optical center differential is negative. 73.6 6.1 * height of the optical center of each vertical difference between the optical center of the bottom side of the mirror circle tangent to the baseline measurement (the measurement with a focus meter is adjustable mirror bezel ring in contact with the bottom, and can be baffle orientation angle is adjusted using the standard column test calibrated lenses, so use this to do more appropriate baseline measurement), on the right, left, points the other lenses with a vernier caliper 0-chip optical center to measure the level of the distance between the baseline and second the absolute value of the difference between who is the optical center of the vertical difference between each other. 6.2 The optical center of the optical center height with the lens optical center height of the geometric center of circle distance in the vertical direction. Can be measured by two methods: the first is a measure of the optical center, respectively, to measure the level of baseline distance and the geometric center of circle to mirror baseline level determined after the distance optical center height. If the right lens optical center, respectively, measured by the right light and H-H geometry, the right mirror a few laps, then the right the right lens optical center height H = H H right-the right light for a few (H right-> O, expressed in the lens optical center circle geometry the top of the center; H right-<O, said ring lens optical center is located below the geometric center). The second is to determine the optical center of the lens and the mirror on the geometric center circle position, directly measured with a vernier caliper. 7 cylinder with axial deviation of the AF-focal-meter can be measured directly, measurement should be sure to pay attention to the left and right bottom edge of the two mirrors are close to the focus ring can be Tiaodang meter board, otherwise may have a greater measurement error. 8 prism test how the project is the key to accurate positioning, the geometric center of the lens and the geometric center of the lens coincides bearing, you can focus in the AF-style meter to read the value of prism lenses. Inspectors general are usually estimated to determine whether the coincidence of the two center, but the inspectors at the time of testing is to observe the side bearing, and inevitably there will be visual error, it is proposed to eliminate this error using the following method: First, the grid coordinates in the standard bearings according to the size of the paper draw a circle equivalent diameter, and then against the coordinates of the geometric center of the lens paper with the geometric center of the circle coincide, and the marker with a fine as much as possible on the lens Draw a circle bearing. Only need to test the lens alignment and bearing on the coincidence of the circle can be read directly display the value of prism deviation. 9 exterior lighting should be noted that under the conditions specified observation, otherwise it will have a greater subjective error. In short, we hope the process of testing personnel in accordance with standard testing methods and standards, as far as possible measurement errors to a minimum range. Hosting of the 2008 calibration / detection technology training registration notice Institute of Metrology in 2008 that electronic information will be held four training courses, room and board to facilitate arrangements for students willing to participate, please register in advance (one month before the beginning of the formal distribution notice). (A) the time and place: 1. Distortion and jitter modulation and digital calibration technology training courses, held in Yichang, Hubei September. 2. EMC testing No. 13 technical training courses held in Beijing in March 1O. (B) Training: overview of the relevant parameters of the development at home and abroad, working principle of measurement standards, calibration / test methods and evaluation, introduction of new technologies, new standards of measurement display. (C) Instructor: Professor and invited well-known measurement expert instruction. (D) Graduation Certificate: Oscilloscope test / calibration training courses and the spectrum analyzer, distortion, modulation, digital jitter calibration training courses presented by the China Institute of Metrology graduation certificate; EMC testing technology training by the China Certification Center for Electromagnetic Compatibility and China Institute of Metrology jointly awarded graduation certificates. (E) Training costs: 1,500 yuan / person (excluding accommodation costs). (F) Contact: Department of the East in yuhd (~ nim.rdc.cn Chan ~ 'Xchenhong@nim.aC.cnTel: O1O ~ 64212076Fax :010-64292353-74 ・ salt Jin Mo:

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