# US 2019/0376907 A1 · Light-scattering dust sensor

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- Number: US 2019/0376907 A1
- Document ID: US20190376907A1
- Status: Published application
- Kind: A1
- Application number: 16/217,571
- Filed: 2018-12-12
- Published: 2019-12-12
- Earliest claimed: 2018-06-11
- Assignees: Samyoung S&C Co., Ltd.
- Applicants: Samyoung S&C Co., Ltd.
- Inventors: Sang Ick Park; Do Hoon Kim; Hyun Chul Hwang; Myeong Yong Lee; Dong Ju Kim
- Web page: https://patentgrep.com/patent/US20190376907A1

## CPC

- G01N 21/53: within a flowing fluid, e.g. smoke
- G01N 21/94: Investigating contamination, e.g. dust (G01N21/85 takes precedence)
- G01N 15/0205: by optical means
- G01N 15/06: Investigating concentration of particle suspensions (by weighing G01N5/00; investigating sedimentation of particle suspensions G01N15/04; investigating individual particles G01N15/10)
- G01N 15/0656: {using electric, e.g. electrostatic methods or magnetic methods (by investigating individual particles G01N15/1031, G01N15/12)}
- G01N 21/47: Scattering, i.e. diffuse reflection (G01N21/25, G01N21/41 take precedence {G01N21/55 takes precedence})
- G01N 21/85: Investigating moving fluids or granular solids
- G01N 15/075: by optical means
- G01N 2015/0046: {in gas, e.g. smoke}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A light-scattering dust sensor includes: a light scattering region; a light emitter configured to emit light to the light scattering region; a light receiver configured to receive scattered light generated in the light scattering region; and an emitted light limiter located between the light emitter and the light scattering region, wherein the light emitted by the light emitter includes: peripheral light; and central light having an intensity that is more uniform than an intensity of the peripheral light, wherein the emitted light limiter is configured to block part of the emitted light, wherein the part of the emitted light blocked by the emitted light limiter includes the peripheral light.

## Claims

### Claim 1

A light-scattering dust sensor comprising:
a light scattering region:
a light emitter configured to emit light to the light scattering region;
a light receiver configured to receive scattered light generated in the light scattering region; and
an emitted light limiter located between the light emitter and the light scattering region,
wherein the light emitted by the light emitter comprises:
peripheral light; and
central light having an intensity that is more uniform than an intensity of the peripheral light,
wherein the emitted light limiter is configured to block part of the emitted light,
wherein the part of the emitted light blocked by the emitted light limiter comprises the peripheral light.

### Claim 2 (depends on 1)

The light-scattering dust sensor of claim 1, wherein the emitted light limiter comprises a slit or an aperture.

### Claim 3 (depends on 2)

The light-scattering dust sensor of claim 2, wherein the slit or the aperture has a size equal to or less than a width of the central light.

### Claim 4 (depends on 3)

The light-scattering dust sensor of claim 3, wherein the light emitter comprises a light-emitting diode (LED).

### Claim 5 (depends on 4)

The light-scattering dust sensor of claim 4, wherein the width of the central light is equal to or less than a width of light determined by a half angle of the LED.

### Claim 6 (depends on 1)

The light-scattering dust sensor of claim 1, further comprising a scattered light limiter located between the light receiver and the light scattering region,
wherein the scattered light limiter is configured to block part of the scattered light, and
the light receiver is further configured to detect another part of the scattered light.

### Claim 7 (depends on 6)

The light-scattering dust sensor of claim 6, wherein the scattered light limiter comprises a plurality of hole structures sequentially arranged from the light scattering region to the light receiver,
wherein the plurality of hole structures respectively comprise a plurality of holes having different sizes.

### Claim 8 (depends on 7)

The light-scattering dust sensor of claim 7, wherein, from among the plurality of holes, a hole adjacent to the light receiver is smaller than a hole adjacent to the light scattering region.

### Claim 9 (depends on 8)

The light-scattering dust sensor of claim 8, wherein the plurality of holes are three holes.

### Claim 10 (depends on 9)

The light-scattering dust sensor of claim 9, further comprising a scattered light focusing lens located between the scattered light limiter and the light scattering region,
wherein the scattered light focusing lens is configured to focus the scattered light such that the focused light is provided to the receiver.

### Claim 11 (depends on 10)

The light-scattering dust sensor of claim 10, further comprising a heater configured to generate heat and thereby move dust particles.