# US 2018/0321083 A1 · Miniature Spectrometer and a Spectroscopic Method

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- Number: US 2018/0321083 A1
- Document ID: US20180321083A1
- Status: Published application
- Kind: A1
- Application number: 15/755,765
- Filed: 2016-08-15
- Published: 2018-11-08
- Earliest claimed: 2015-09-10
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Ingo Herrmann; Martin Husnik; Eugen Baumgart; Christian Huber; Benedikt Stein
- Web page: https://patentgrep.com/patent/US20180321083A1

## CPC

- G01J 3/0224: {using polarising or depolarising elements}
- G01J 3/0205: {Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows}
- G01J 3/0208: {using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction}
- G01J 3/0256: {Compact construction}
- G01J 3/2803: {using photoelectric array detector}
- G01J 3/2823: {Imaging spectrometer}
- G01J 3/447: Polarisation spectrometry
- G01J 3/45: Interferometric spectrometry
- G01J 3/4531: {Devices without moving parts}
- 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 miniature spectrometer includes an optical system, a polarization interferometer with a polarizer and a Savart element and an analyzer, a detection unit with a detector, and a data unit. The optical system of the miniature spectrometer is configured as a diffuser.

## Claims

### Claim 1

A miniature spectrometer, comprising:
an optical system;
a polarization interferometer that includes a polarizer, a Savart element, and an analyzer;
a detection unit that includes a detector; and
a data unit,
wherein the optical system is configured as a diffuser.

### Claim 2 (depends on 1)

The miniature spectrometer as claimed in claim 1, wherein the detection unit comprises a focusing optical unit that is arranged in the beam path between the polarization interferometer and the detector.

### Claim 3 (depends on 1)

The miniature spectrometer as claimed in claim 1, wherein the miniature spectrometer comprises a light source.

### Claim 4 (depends on 1)

The miniature spectrometer as claimed in claim 1, wherein the diffuser is arranged on the polarizer of the polarization interferometer.

### Claim 5 (depends on 1)

The miniature spectrometer as claimed in claim 1, wherein the data unit comprises a reference database.

### Claim 6 (depends on 1)

The miniature spectrometer as claimed in claim 1, wherein the data unit is configured as a communication interface for data transmission between the miniature spectrometer and an external evaluation element that includes a reference database and a data processing unit.

### Claim 7 (depends on 1)

The miniature spectrometer as claimed in claim 1, wherein the detector is in the form of a one-dimensional sensor matrix.

### Claim 8 (depends on 1)

The miniature spectrometer as claimed in claim 1, wherein the detector is in the form of a two-dimensional sensor matrix.

### Claim 9 (depends on 1)

The miniature spectrometer as claimed in claim 1, wherein the optical system is a directional diffuser.

### Claim 10

A method for ascertaining a spectrum of the radiation from an object, comprising:
using a miniature spectrometer to ascertain the spectrum of the radiation that is reflected, transmitted, or emitted by the object, the miniature spectrometer including:
an optical system,
a polarization interferometer that includes a polarizer, a Savart element, and an analyzer,
a detection unit that includes a detector, and
a data unit,
wherein the optical system is configured as a diffuser.