公开(公告)号：US4708477A

公开(公告)日：1987-11-24

申请号：US829273

申请日：1986-02-13

Applicant: Yabusaki Kenji ,  Tozawa Hitoshi ,  Noda Akira ,  Ito Takashi

Inventor： Yabusaki Kenji ,  Tozawa Hitoshi ,  Noda Akira ,  Ito Takashi

IPC: G01J1/08 ,  G01J1/42 ,  G01J1/44

CPC classification number: G01J1/04 ,  G01J1/02 ,  G01J1/0228 ,  G01J1/0455 ,  G01J1/0466 ,  G01J1/08 ,  G01J3/02 ,  G01J3/0232 ,  G01J3/0243 ,  G01J3/0248 ,  G01J3/027 ,  G01J3/1804 ,  G01J3/42 ,  G01J2001/086 ,  G01J2001/4453 ,  G01J2001/446

Abstract: A photometrical apparatus has a first light receiving element, and a second light receiving element less sensitive to temperature and other environmental influences than said first light receiving element whereby a value Pm of measured quantity of light from the subject is calculated from the following formula ##EQU1## Pr designates a quantity of light from a standard light source, Dr and Dm designate outputs of the first light receiving element generated by the light from the standard light source and the subject, Dpo and Dpt designate outputs of the first light receiving element generated by the light from the reference light source and the subject, and Dso and Dst designate outputs of the second light receiving element generated by the light from the reference light source and the subject.

Abstract translation: 光度测量装置具有第一光接收元件和对所述第一光接收元件的温度和其他环境影响不敏感的第二光接收元件，从而根据以下公式计算来自被摄体的测量光量的值Pm Pr表示来自标准光源的光量，Dr和Dm表示由来自标准光源和被摄体的光产生的第一光接收元件的输出，Dpo和Dpt表示由第一光接收元件产生的第一光接收元件的输出， 来自参考光源和被摄体的光，Dso和Dst表示由来自参考光源和被摄体的光产生的第二光接收元件的输出。

公开(公告)号：US4669877A

公开(公告)日：1987-06-02

申请号：US704368

申请日：1985-02-22

Applicant: Charles M. Wittmer

Inventor： Charles M. Wittmer

IPC: G01J1/44 ,  G01J3/42 ,  H03G3/20 ,  H01J39/12

CPC classification number: H03G3/3026 ,  G01J3/42 ,  G01J2001/4406 ,  G01J2001/4453

Abstract: A digital gain controlled current to voltage amplifier having particular utility for interfacing with and forming part of a spectrophotometer system with a photomultiplier tube being responsive to light for producing an analog current proportional to the intensity thereof. The digital gain controlled current to voltage amplifier incorporates a current switched multiplying digital-to-analog converter inside its feedback loop. In this manner, the feedback loop impedance may be maintained constant as its gain is varied under control of a software programmed microcomputer.

Abstract translation: 数字增益控制电流到电压放大器具有用于与分光光度计系统连接并形成分光光度计系统的一部分的特别实用性，其中光电倍增管响应于光以产生与其强度成比例的模拟电流。 数字增益控制电流到电压放大器在其反馈环路内部包含电流开关倍增数模转换器。 以这种方式，当软件编程的微型计算机的控制下，其增益变化时，反馈回路阻抗可以保持恒定。