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1.发明授权Calibration means for instrument for reading dust accumulations on dark slides 失效用于读取灰色滑块上的灰尘累积的仪器的校准装置
公开(公告)号：US3702734A
公开(公告)日：1972-11-14
申请号：US3702734D
申请日：1971-05-03
Applicant: SAAB SCANIA AB
CPC classification number: G01N21/274 , G01N15/0618
Abstract: AN INSTRUMENT FOR MEASURING DUST ACCUMULATION ON A DARK SLIDE, OF THE TYPE DISCLOSED IN U.S. PAT NO 3,526,461, IS CALIBRATED BEFORE EACH USE WITH A CALIBRATION MEANS MOUNTED IN IT FOR MOVEMENT BETWEEN A CALIBRATION POSITION AT THE LOCATION TO BE OCCUPIES BY SLIDES AN AN OUT-OF-THE-WAY POSITION. THE CALIBRATION MEANS COMPRISES MEANS FOR REFLECTING TOWARD THE PHOTOCELL OF THE INSTRUMENT A PORTION OF THE LIGHT SHONE ACROSS SLIDES, AND PRECALIBRATED MEANS FOR CONTROLLING THE AMOUNT OF SUCH REFLECTED LIGHT THAT STRIKES THE PHOTOCELL.
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