# US 6,724,472 B2 · Light monitoring device

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- Number: US 6,724,472 B2
- Document ID: US6724472B2
- Status: Granted
- Kind: B2
- Application number: 10/047,214
- Filed: 2002-01-14
- Published: 2003-07-17
- Granted: 2004-04-20
- Earliest claimed: 2002-01-14
- Assignees: Ushikata Mfg. Co., Ltd.
- Inventors: Akio Kubo
- Web page: https://patentgrep.com/patent/US6724472B2

## CPC

- G01J 1/4257: {applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam (monitoring arrangements for lasers in general H01S3/0014)}
- G01J 1/04: Optical or mechanical part {supplementary adjustable parts}
- G01J 1/0411: {using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction}
- G01J 1/0414: {using plane or convex mirrors, parallel phase plates, or plane beam-splitters}
- G01J 1/0271: {Housings; Attachments or accessories for photometers}
- G01J 2001/0481: {Preset integrating sphere or cavity}
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)

## Abstract

Object: provide an accurate monitor of light of even intensity light. Construction: A beam splitter (4) being fixed on a base (1) in the path of a main beam (2) of a light system, a reflecting mirror (5) being fixed on a side of the beam splitter (4), an inlet 6a of an integrating sphere (6) is provided at an opposite side of the beam splitter (4), and a light sensor (8) is provided at a reflecting surface of the integrating sphere (6).

## Claims

### Claim 1

A light monitoring system for measuring light comprising;
a beam splitter (4) fixed in a box (1) in the path of a main beam (2);
a reflecting mirror (5) on one side of said beam splitter (4) for reflecting light received from said beam splitter (4);
an integrating sphere (6) having an inlet (6a) and a reflecting surface (6b) for receiving light reflected from said reflecting mirror (5), said integrating sphere (6) being on a side of said main beam (2) opposite said reflecting mirror (5); and
a light sensor (8) in said integrating sphere for receiving reflected light passing through said integrating sphere inlet (6a);
whereby optimized light can be monitored and accurately measured.

### Claim 2 (depends on 1)

The light monitoring system according to claim 1 including;
a visible light emitter (10), light from said visible light emitter (10) being superimposed on light from said main beam (2) passing through said beam splitter (4); and a target (12) receiving said light from said main beam with superimposed light from said visible light emitter (10); whereby observation of said main beam (2) superimposed with said visible light emission (10) is enabled.

### Claim 3 (depends on 2)

The light monitoring system according to claim 2 in which said reflecting mirror (5) is a concave mirror (5a) positioned for receiving and reflecting an optimized proportion of light from said main beam (2) superimposed with said visible light (10) from said beam splitter (4) into said inlet (6a) of said integrating sphere (6); whereby accurate monitoring is achieved.