Hyperspectral imaging arrangement

Patent metadata

Field	Value
Publication number	US-9835847-B2
Application number	US-201715459164-A
Country	US
Kind code	B2
Filing date	Mar 15, 2017
Priority date	Mar 15, 2016
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

An arrangement for hyperspectral imaging, comprising an imaging sensor ( 170,270 ); a band-pass filter element ( 130,230 ): at least one imaging optics element ( 120,160,220,260 ) configured to form an image on the imaging sensor ( 170,270 ); and a first adjustable multi passband filter ( 150 a, 255 ); wherein the first ( 150 a, 255 ) adjustable multi passband filter is configured to be adjusted by tilting.

First claim

The invention claimed is:

1. An arrangement for hyperspectral imaging, comprising an imaging sensor ( 170 , 270 );
a band-pass filter element ( 130 , 230 ):
at least one imaging optics element ( 120 , 160 , 220 , 260 ) configured to form an image on the imaging sensor ( 170 , 270 ); and
a first adjustable multi passband filter ( 150 a , 255 ) and a second adjustable multi passband filter ( 150 b , 250 ); wherein that the first adjustable multi passband filter ( 150 a , 255 ) and the second adjustable multi passband filter ( 150 b , 250 ) are positioned consecutively on the optical path; and in that
at least one of the first ( 150 a ) and the second ( 150 b ) adjustable multi passband filter is configured to be adjusted by tilting.

2. The arrangement of claim 1 , wherein the first ( 150 a ) and/or the second ( 150 b ) multi passband filter comprise an adjustable Fabry-Perot interferometer.

3. The arrangement of claim 2 , wherein at least one of the first ( 150 a ) and the second ( 150 b ) adjustable Fabry-Perot interferometer is configured to have a fixed gap and to be adjusted by tilting.

4. The arrangement of claim 2 , wherein both the first ( 150 a ) and the second ( 150 b ) adjustable Fabry-Perot interferometer is configured to have a fixed gap and to be adjusted by tilting.

5. The arrangement of claim 2 , wherein the first adjustable Fabry-Perot interferometer ( 255 ) is configured to have a fixed gap and to be adjusted by tilting and the second adjustable Fabry-Perot interferometer ( 250 ) is configured to be adjusted by adjusting the gap.

6. The arrangement of claim 1 , further comprising an array ( 110 a , 110 b ) of light emitting diodes configured to illuminate the target ( 10 ) to be imaged; each light emitting diode having a wavelength different from the other light emitting diodes.

7. The arrangement of claim 1 , wherein the band-pass filter element ( 130 , 230 ) comprises a short-pass filter and a long-pass filter.

8. The arrangement of claim 1 , wherein the band-pass filter element ( 130 , 230 ) is configured to pass a predetermined wavelength range of 360 to 1100 nm or 450 to 850 nm.

9. The arrangement of claim 4 , wherein the first ( 150 a ) and the second ( 150 b ) adjustable Fabry-Perot interferometer are configured to be adjusted by tilting in the same angle in opposite directions.

10. The arrangement of claim 1 , wherein the imaging sensor ( 170 , 270 ) comprises a monochromatic or RGB image sensor.

11. The arrangement of claim 1 , wherein the imaging sensor ( 170 , 270 ) is comprised in a portable electronic device.

12. A multi passband filter arrangement for hyperspectral imaging, comprising
a first adjustable multi passband filter ( 150 a , 255 ) and a second adjustable multi passband filter ( 150 b , 250 ); wherein that
the first adjustable multi passband filter ( 150 a , 255 ) and the second adjustable multi passband filter ( 150 b , 250 ) are positioned consecutively on the optical path; and in that
at least one of the first ( 150 a ) and the second ( 150 b ) adjustable multi passband filter is configured to be adjusted by tilting.

13. The arrangement of claim 12 , wherein the first ( 150 a ) and the second ( 150 b ) multi passband filter comprise an adjustable Fabry-Perot interferometer.

14. The arrangement of claim 13 , wherein at least one of the first ( 150 a ) and the second ( 150 b ) adjustable Fabry-Perot interferometer is configured to have a fixed gap and to be adjusted by tilting.

15. The arrangement of claim 13 , wherein both the first ( 150 a ) and the second ( 150 b ) adjustable Fabry-Perot interferometer is configured to have a fixed gap and to be adjusted by tilting.

16. The arrangement of claim 13 , wherein the first adjustable Fabry-Perot interferometer ( 255 ) is configured to have a fixed gap and to be adjusted by tilting and the second adjustable Fabry-Perot interferometer ( 250 ) is configured to be adjusted by adjusting the gap.

17. A method for hyperspectral imaging, comprising
providing an image with an imaging sensor ( 170 , 270 );
adjusting a first adjustable multi passband filter ( 150 a , 255 ) and a second adjustable multi passband filter ( 150 b , 250 ) to provide the required transmission properties in order to receive at the imaging sensor ( 170 , 270 ) the required wavelengths; wherein
the first adjustable multi passband filter ( 150 a , 255 ) and the second adjustable multi passband filter ( 150 b , 250 ) are positioned consecutively on the optical path; and wherein
at least one of the first ( 150 a ) and the second ( 150 b ) adjustable multi passband filter is configured to be adjusted by tilting.

18. The method of claim 17 , wherein the first ( 150 a ) and/or the second ( 150 b ) multi passband filter comprise an adjustable Fabry-Perot interferometer.

Assignees

• Teknologian Tutkimuskeskus Vtt Oy

Inventors

• Saari Heikki
• Siikanen Sami

Classifications

• H04N23/56

  provided with illuminating means · CPC title

• G01J2003/1243

  Pivoting IF or other position variation · CPC title

• G02B26/001 Primary

  based on interference in an adjustable optical cavity (interference filters G02B5/28; devices or arrangements using multiple reflections in spectrometry or monochromators G01J3/26) · CPC title

• G01J2003/2813

  2D-array · CPC title

• G02B26/007

  the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light · CPC title