CN2160894Y

CN2160894Y - Double-path optical measurer

Info

Publication number: CN2160894Y
Application number: CN 93213855
Authority: CN
Inventors: 康文刚
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 1993-05-22
Filing date: 1993-05-22
Publication date: 1994-04-06
Anticipated expiration: 2003-05-22

Abstract

The utility model relates to a double-path optical measurer which comprises a housing, an optical source, an optical device, a photo detector, an amplifier, an A/D converter, a microcomputer and a display component. The utility model is additionally provided with another circuit composed of a photo detector and an amplifier which are connected in parallel with the optical device, the photo detector and the amplifier, and the circuit is connected with the input end of the reference voltage of the and the A/D converter. The measured digital quantity which is N=V< X >/V< R >. K output by the A/D converter of the utility model is a constant, so the measured digital quantity can not be changed by the long term drift and short-term fluctuation of the optical source. Therefore, the utility model eliminates the error of the measuring instrument and enhances the stability, so the utility model is suitable for precision measuring instruments, and the utility model has simple structure and easy use.

Description

Double-path optical measurer

The utility model relates to a kind of optical gauge.

Great majority generally are made up of shell, light source, optical devices, photodetector, amplifier, voltage-reference, A/D transducer, microcomputer, display unit with the optical gauge of light source as illumination at present.The output digital quantity N of A/D transducer strictly with V _X/ V _RProportional relation, V _XBe measuring voltage, V _RIt is the reference voltage that provides to the A/D transducer.And measuring voltage V _XIncide optical devices with light source.The variation of spectral radiant flux φ (λ) and proportional variation.Hence one can see that, and as the spectral radiant flux φ of light source (λ) when changing, then the output digital quantity N of A/D transducer also and then changes.This optical gauge is measured the long-term drift of light path light source and the fluctuation of short-term, will produce certain influence to the measurement of fine measuring instrument, unless the power supply of lighting source is comparatively ideal constant current source or constant pressure source.

A kind of reference voltage that provides to the A/D transducer is provided the purpose of this utility model, the optical gauge that changes synchronously along with the variation of measuring voltage.

The purpose of this utility model is achieved in that in existing optical gauge, another road and original optical devices, photodetector, amplifier photodetector, amplifier arranged side by side have been set up, the output termination amplifier input terminal of its photodetector, the reference voltage input of A/D transducer in the output termination optical gauge of amplifier.Because the output digital quantity N=V of A/D transducer _X/ V _RK, K are constant, and reference voltage V _RBe by the voltage of another road photodetector conversion, this voltage and measuring voltage V are provided after amplifier amplifies _XChange synchronously in identical ratio, so the digital quantity N=V of A/D transducer output _X/ V _RThe K=constant remains unchanged.

The utility model makes the reference voltage V of A/D transducer owing to adopted binary channels to measure simultaneously _RWith measuring voltage V _XChange synchronously in identical ratio, therefore, the long term drift of light source and short-term fluctuation can be to the digital quantity N=V of A/D transducer output _X/ V _RK exerts an influence, thereby has eliminated the error of optical gauge, has improved its degree of accuracy.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is an outside drawing of the present utility model;

Fig. 2 is the cut-open view of optical measurement part;

Fig. 3 is a schematic diagram of the present utility model.

With reference to Fig. 1, on the housing 1 of optical measuring instrument display unit 2 is arranged.

With reference to Fig. 2, Fig. 3, optical devices 4 mainly are made up of lens, Guang Lan, color filter, and photodetector 5 is photoelectric cell or is photomultiplier, amplifier 6 is OP05 or is OP07, OP15, the A/D transducer is MC14433, and microcomputer is 8031, and display unit 2 is LED; The photodetector 7 on another road is photoelectric cell or is photomultiplier that amplifier 8 is OP05 or is OP07, OP15.

The luminous flux φ on the measurement channel direction by light source 3 generations ₁(λ) through optical devices 4, be transformed into voltage by photodetector 5 receptions, amplify input A/D transducers by amplifier 6 again; The luminous flux φ on the benchmark channel direction by light source 3 generations ₂(λ) received by photodetector 7 simultaneously, be transformed into voltage, amplify the reference voltage terminal of input A/D transducer again by amplifier 8, as the reference voltage of A/D transducer.

Claims

1, a kind of binary channels optical measuring instrument, comprise shell [1], light source [3], optical devices [4], photodetector [5], amplifier [6], A/D transducer, microcomputer, display unit [2], of the present utility model being characterised in that is provided with another road and described optical devices [4], photodetector [5], amplifier [6] photodetector [7], amplifier [8] arranged side by side, the input end of the output termination amplifier [8] of photodetector [7], the reference voltage input of the output termination A/D transducer of amplifier [8].