公开(公告)号：US5073707A

公开(公告)日：1991-12-17

申请号：US528750

申请日：1990-05-24

Applicant: Edward Marcin

Inventor： Edward Marcin

IPC: G01N21/59 ,  G01N21/86 ,  G01N21/896

CPC classification number: G01N21/59 ,  G01N2021/9586 ,  G01N21/86 ,  G01N2201/0256

Abstract: A light-transmittance meter (10) employs a housing (12) that forms a slot (16) in which the edge of a window pane (14) can be received. A microswitch (24) detects initial insertion of the window (14) into the slot (16) and causes a sample-and-hold circuit (32) to store a value representing the output that a photodiode (20) produces in response to light received from a light-emitting diode 18 before the window pane (14) is interposed between them. A ratio meter (36) then receives the output of the photodiode (20) when the window (14) has been interposed between the LED (18) and the photodiode (20), and it generates a display (22) of the ratio of that value to the initial, reference value determined before the window 14 was completely inserted.

Abstract translation: 光透射仪（10）采用形成可容纳窗玻璃（14）的边缘的槽（16）的外壳（12）。 微型开关（24）检测窗口（14）的初始插入到插槽（16）中并且使采样和保持电路（32）存储表示光电二极管（20）响应于光产生的输出的值 在窗玻璃（14）插入它们之前从发光二极管18接收。 当窗（14）已经插入在LED（18）和光电二极管（20）之间时，比率计（36）接收光电二极管（20）的输出，并且产生显示器（22） 该值与窗口14完全插入之前确定的初始参考值。