公开(公告)号：US3902806A

公开(公告)日：1975-09-02

申请号：US46269674

申请日：1974-04-22

Applicant: AMERICAN OPTICAL CORP

Inventor： BOBER ROBERT E

IPC: G01N21/25 ,  G05F1/56 ,  G01N33/16

CPC classification number: G05F1/56 ,  G01N21/255

Abstract: A circuit for use with an oximeter system which provides constant current pulses to light-emitting diodes in a sequential and cyclical manner. The circuit maintains magnitudes of pulses in the pulse train equal to certain other pulses in the pulse train over extremes of temperature variation, voltage variation, and time duration. Each diode is energized by a series of pulses having the same magnitude, although pulse magnitudes will vary from diode to diode. Therefore, light output from one lightemitting diode remains proportional to light output from the others.

Abstract translation: 一种与血氧计系统一起使用的电路，其以顺序和循环方式向发光二极管提供恒定的电流脉冲。 在温度变化，电压变化和持续时间的极端情况下，该电路将脉冲串中的脉冲幅度保持在脉冲序列中的某些其他脉冲。 每个二极管由具有相同幅度的一系列脉冲通电，尽管脉冲幅度将随二极管而变化。 因此，来自一个发光二极管的光输出与其它发光二极管的光输出成比例。