# US 9,040,931 B1 · Method and apparatus for identifying CVD diamond

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- Number: US 9,040,931 B1
- Document ID: US9040931B1
- Status: Granted
- Kind: B1
- Application number: 14/485,820
- Filed: 2014-09-15
- Published: 2015-06-11
- Granted: 2015-05-26
- Earliest claimed: 2013-12-11
- Applicants: Chih-Chung Yuan
- Inventors: Chih-Chung Yuan
- Web page: https://patentgrep.com/patent/US9040931B1

## CPC

- G01N 21/55: Specular reflectivity
- G01N 21/255: {Details, e.g. use of specially adapted sources, lighting or optical systems}
- G01N 21/87: Investigating jewels (G01N21/88 takes precedence)
- G01N 2201/061: Sources
- G01N 2201/08: Optical fibres; light guides
- 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

Method for identifying CVD diamond comprises (1) placing a clean diamond on a fixed platform; (2) illuminating the diamond with light having various wavelengths; (3) receiving reflected light from the diamond; (4) calculating a reflectance value at each wavelength based on a light intensity at each wavelength of the reflected light, generating a spectral reflectance curve; (5) determining whether the spectral reflectance curve has a sharp trough, then storing the diamond if the spectral reflectance curve thereof does not have the sharp trough, while selecting the diamond for a further identification if the spectral reflectance curve thereof has the sharp trough; and (6) determining whether the sharp trough of the diamond selected from the step (5) is at a wavelength between 227 nm and 233 nm, and identifying the diamond to be the CVD diamond if the sharp trough is at the wavelength between 227 nm and 233 nm.

## Claims

### Claim 1

A method for identifying a CVD diamond, characterized in that, the method comprises the steps of:
(1) placing a clean diamond on a fixed platform;
(2) illuminating the diamond with light having various wavelengths;
(3) receiving reflected light from the diamond;
(4) calculating a reflectance value at each wavelength based on a light intensity at each wavelength of the reflected light, generating a spectral reflectance curve;
(5) determining whether the spectral reflectance curve has a sharp trough, then storing the diamond if the spectral reflectance curve thereof does not have the sharp trough, while selecting the diamond for a further identification if the spectral reflectance curve thereof has the sharp trough; and
(6) determining whether the sharp trough of the diamond selected from the step (5) is at a wavelength between 227 nm and 233 nm, and identifying the diamond to be the CVD diamond if the sharp trough is at the wavelength between 227 nm and 233 nm.

### Claim 2 (depends on 1)

The method as claimed in claim 1, characterized in that, in the step (2), the various wavelengths range from 200 nm to 450 nm.

### Claim 3 (depends on 1)

The method as claimed in claim 1, characterized in that, in the step (6), the diamond selected from the step (5) is identified to be the CVD diamond if the wavelength of the sharp trough is 230 nm.

### Claim 4 (depends on 2)

The method as claimed in claim 2, characterized in that, in the step (6), the diamond selected from the step (5) is identified to be the CVD diamond if the wavelength of the sharp trough is 230 nm.

### Claim 5

An apparatus for identifying a CVD diamond, characterized in that, the apparatus comprises:
a light-emitting system for illuminating a diamond with light having various wavelengths;
a light-receiving system for receiving reflected light from the diamond;
a signal-converting system for converting an intensity of the reflected light received by the light-receiving system to a digital signal at each wavelength; and
a processing system for processing the digital signal into a reflectance value, generating a spectral reflectance curve and determining whether the spectral reflectance curve has a sharp trough at a wavelength between 227 nm and 233 nm.

### Claim 6 (depends on 5)

The apparatus as claimed in claim 5, characterized in that, the apparatus further comprises a displaying system which automatically displays an indication of CVD diamond when the processing system confirms that the spectral reflectance curve of the diamond has the sharp trough at the wavelength between 227 nm and 233 nm.

### Claim 7 (depends on 5)

The apparatus as claimed in claim 5, characterized in that, the light having various wavelengths emitted by the light-emitting system has wavelengths ranging from 220 nm to 450 nm.

### Claim 8 (depends on 5)

The apparatus as claimed in claim 5, characterized in that, the diamond to be identified is colorless or near-colorless.

### Claim 9 (depends on 5)

The apparatus as claimed in claim 5, characterized in that, the light-receiving system comprises a probe lens and an optical fiber, wherein the probe lens is used for enlarging a light-collecting area, the optical fiber is used for transmitting a light signal, and the light-receiving system may be equipped with various types of the optical fiber.