# US 7,609,963 B2 · Apparatus to produce spectrums

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- Number: US 7,609,963 B2
- Document ID: US7609963B2
- Status: Granted
- Kind: B2
- Application number: 11/416,232
- Filed: 2006-05-03
- Published: 2007-01-18
- Granted: 2009-10-27
- Earliest claimed: 2005-07-12
- Inventors: Roger Wayne Brown
- Web page: https://patentgrep.com/patent/US7609963B2

## CPC

- G01J 3/00: Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J 3/2803: {using photoelectric array detector}
- 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

A method of placing a grating material at an optimum distance from a sensor that will produce a reference spectrum on that sensor. In a preferred embodiment of the present invention, a device with a diffraction grating end will protrude into the empty lens well of a camera and with the camera inserted into a telescope eyepiece holder will focus both a image of an object, that the telescope is pointed to, and its spectrum onto the light sensor in the camera. This dual image, called a reference spectrum, allows the separation between the image of the object and a point in the image of its spectrum to be determined quickly. This separation distance to the spectral point within the spectrum is then a referenced distance. Once a reference distance is known it is then used to determine the wavelength of any other point or spectral line within the spectrum.

## Claims

### Claim 1

An apparatus to produce spectrums comprising:
an apparatus housing that receives a source of light from a telescope,
wherein the housing fits inside a camera's empty lens well;
means for fitting the housing within the lens well; and
a transparent diffraction grating material rigidly connected to the housing;
wherein the grating is located near the camera's photo sensor to receive the spectrum, and
wherein the apparatus does not require a threaded eyepiece.

### Claim 2

An apparatus to produce spectrums comprising:
a lower housing that receives a source of light from a telescope from a bottom end of the apparatus;
a housing that loosely fits the inside of a camera's empty lens well;
a washer connecting the lower housing to the housing;
a transparent diffraction grating material rigidly connected to the housing; and
a means for fitting the apparatus to the camera;
wherein the apparatus does not require a threaded eyepiece; and
wherein said grating is located near the camera's photo sensor to receive the spectrum.

### Claim 3 (depends on 1)

The apparatus to produce spectrums in accordance with claim 1, wherein the housing incorporates a transparent cover material that protects the grating.

### Claim 4 (depends on 2)

The apparatus to produce spectrums in accordance with claim 2, wherein the housing incorporates a transparent cover material that protects the grating.

### Claim 5 (depends on 2)

The apparatus to produce spectrums in accordance with claim 2, wherein the means for fitting the apparatus to the camera comprises threads.