# US 8,786,854 B2 · Spectroscopic detector

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- Number: US 8,786,854 B2
- Document ID: US8786854B2
- Status: Granted
- Kind: B2
- Application number: 13/316,767
- Filed: 2011-12-12
- Published: 2012-06-21
- Granted: 2014-07-22
- Earliest claimed: 2010-12-17
- Assignees: Olympus Corporation
- Applicants: Yuya Miyazono
- Inventors: Yuya Miyazono
- Web page: https://patentgrep.com/patent/US8786854B2

## CPC

- G01J 3/00: Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J 3/02: Details
- G01J 3/0208: {using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction}
- G01J 3/28: Investigating the spectrum (using colour filters G01J3/51)
- 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 spectroscopic detector includes a spectroscopic element for dispersing light, a photodetector for detecting the light dispersed by the spectroscopic element and a condensing optical system for condensing the dispersed light to the photodetector and compensating for a deviation in a detected wavelength deriving from nonlinearity of the angle of emergence generated in the spectroscopic element through chromatic aberration of magnification.

## Claims

### Claim 1

A spectroscopic detector comprising:
a spectroscopic element which disperses light;
a photodetector which detects the light dispersed by the spectroscopic element; and
a condensing optical system which condenses the dispersed light to the photodetector, and which compensates for a deviation in a detected wavelength deriving from nonlinearity of an angle of emergence generated in the spectroscopic element through chromatic aberration of magnification;
wherein assuming λ1 is a minimum value of wavelengths captured by the photodetector, λ2 is a maximum value of wavelengths captured by the photodetector, δ1 is chromatic aberration of magnification at a maximum image height of the condensing optical system with respect to light of wavelength λ1, and δ2 is chromatic aberration of magnification at a maximum image height of the condensing optical system with respect to light of wavelength λ2, the following conditional expression is satisfied: δ1>δ2.

### Claim 2 (depends on 1)

The spectroscopic detector according to claim 1, wherein the condensing optical system comprises one positive lens and one negative lens, and assuming that an Abbe number of the positive lens is νp, and an Abbe number of the negative lens νn, the following conditional expression is satisfied: 2<νp/νn<5.

### Claim 3 (depends on 1)

The spectroscopic detector according to claim 1, further comprising:
a slit that causes light to impinge on the spectroscopic detector; and
a collimator optical system placed between the slit and the spectroscopic element, wherein axial chromatic aberration generated in the condensing optical system is corrected by the collimator optical system.