Short-wave infrared (SWIR) spectral imager based on Fabry-Perot interferometer for remote sensing

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

12 Citations (Scopus)

Abstract

VTT Technical Research Centre of Finland has developed a spectral imager for short-wave infrared (SWIR) wavelength range. The spectral imager is based on a tunable Fabry-Perot interferometer (FPI) accompanied by a commercial InGaAs Camera. The FPI consists of two dielectric coated mirrors separated by a tunable air gap. Tuning of the air gap tunes also transmitted wavelength and therefore FPI acts as a tunable band bass filter. The FPI is piezo-actuated and it uses three piezo-actuators in a closed capacitive feedback loop for air gap tuning. The FPI has multiple order transmission bands, which limit free spectral range. Therefore spectral imager contains two FPI in a stack, to make possible to cover spectral range of 1000 - 1700 nm. However, in the first tests imager was used with one FPI and spectral range was limited to 1100-1600 nm. The spectral resolution of the imager is approximately 15 nm (FWHM). Field of view (FOV) across the flight direction is 30 deg. Imaging resolution of the spectral imager is 256 x 320 pixels. The focal length of the optics is 12 mm and F-number is 3.2. This imager was tested in summer 2014 in an unmanned aerial vehicle (UAV) and therefore a size and a mass of the imager were critical. Total mass of the imager is approximately 1200 grams. In test campaign the spectral imager will be used for forest and agricultural imaging. In future, because results of the UAV test flights are promising, this technology can be applied to satellite applications also.
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publicationSPIE 9241, Sensors, Systems, and Next-Generation Satellites XVIII, 2014
PublisherInternational Society for Optics and Photonics SPIE
Number of pages8
ISBN (Print)978-1-6284-1304-5
DOIs
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
EventSensors, Systems, and Next-Generation Satellites XVIII - Amsterdam, Netherlands
Duration: 22 Sep 201425 Sep 2014

Publication series

SeriesProceedings of SPIE
Volume9241
ISSN0277-786X

Conference

ConferenceSensors, Systems, and Next-Generation Satellites XVIII
CountryNetherlands
CityAmsterdam
Period22/09/1425/09/14

Fingerprint

Fabry-Perot interferometers
remote sensing
pilotless aircraft
air
tuning
Finland
flight tests
wavelengths
spectral resolution
field of view
summer
actuators
pixels
cameras
flight
optics
mirrors
filters

Keywords

  • hyperspectral sensors
  • multispectral image sensors
  • Fabry-Perot Interferometer
  • Piezo actuators
  • imaging spectrometer
  • UAV
  • airborne
  • precision agriculture

Cite this

Mannila, R., Holmlund, C., Ojanen, H. J., Näsilä, A., & Saari, H. (2014). Short-wave infrared (SWIR) spectral imager based on Fabry-Perot interferometer for remote sensing. In Proceedings : SPIE 9241, Sensors, Systems, and Next-Generation Satellites XVIII, 2014 International Society for Optics and Photonics SPIE. Proceedings of SPIE, Vol.. 9241 https://doi.org/10.1117/12.2067206
Mannila, Rami ; Holmlund, Christer ; Ojanen, Harri J. ; Näsilä, Antti ; Saari, Heikki. / Short-wave infrared (SWIR) spectral imager based on Fabry-Perot interferometer for remote sensing. Proceedings : SPIE 9241, Sensors, Systems, and Next-Generation Satellites XVIII, 2014. International Society for Optics and Photonics SPIE, 2014. (Proceedings of SPIE, Vol. 9241).
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abstract = "VTT Technical Research Centre of Finland has developed a spectral imager for short-wave infrared (SWIR) wavelength range. The spectral imager is based on a tunable Fabry-Perot interferometer (FPI) accompanied by a commercial InGaAs Camera. The FPI consists of two dielectric coated mirrors separated by a tunable air gap. Tuning of the air gap tunes also transmitted wavelength and therefore FPI acts as a tunable band bass filter. The FPI is piezo-actuated and it uses three piezo-actuators in a closed capacitive feedback loop for air gap tuning. The FPI has multiple order transmission bands, which limit free spectral range. Therefore spectral imager contains two FPI in a stack, to make possible to cover spectral range of 1000 - 1700 nm. However, in the first tests imager was used with one FPI and spectral range was limited to 1100-1600 nm. The spectral resolution of the imager is approximately 15 nm (FWHM). Field of view (FOV) across the flight direction is 30 deg. Imaging resolution of the spectral imager is 256 x 320 pixels. The focal length of the optics is 12 mm and F-number is 3.2. This imager was tested in summer 2014 in an unmanned aerial vehicle (UAV) and therefore a size and a mass of the imager were critical. Total mass of the imager is approximately 1200 grams. In test campaign the spectral imager will be used for forest and agricultural imaging. In future, because results of the UAV test flights are promising, this technology can be applied to satellite applications also.",
keywords = "hyperspectral sensors, multispectral image sensors, Fabry-Perot Interferometer, Piezo actuators, imaging spectrometer, UAV, airborne, precision agriculture",
author = "Rami Mannila and Christer Holmlund and Ojanen, {Harri J.} and Antti N{\"a}sil{\"a} and Heikki Saari",
year = "2014",
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Mannila, R, Holmlund, C, Ojanen, HJ, Näsilä, A & Saari, H 2014, Short-wave infrared (SWIR) spectral imager based on Fabry-Perot interferometer for remote sensing. in Proceedings : SPIE 9241, Sensors, Systems, and Next-Generation Satellites XVIII, 2014. International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 9241, Sensors, Systems, and Next-Generation Satellites XVIII, Amsterdam, Netherlands, 22/09/14. https://doi.org/10.1117/12.2067206

Short-wave infrared (SWIR) spectral imager based on Fabry-Perot interferometer for remote sensing. / Mannila, Rami; Holmlund, Christer; Ojanen, Harri J.; Näsilä, Antti; Saari, Heikki.

Proceedings : SPIE 9241, Sensors, Systems, and Next-Generation Satellites XVIII, 2014. International Society for Optics and Photonics SPIE, 2014. (Proceedings of SPIE, Vol. 9241).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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AU - Saari, Heikki

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N2 - VTT Technical Research Centre of Finland has developed a spectral imager for short-wave infrared (SWIR) wavelength range. The spectral imager is based on a tunable Fabry-Perot interferometer (FPI) accompanied by a commercial InGaAs Camera. The FPI consists of two dielectric coated mirrors separated by a tunable air gap. Tuning of the air gap tunes also transmitted wavelength and therefore FPI acts as a tunable band bass filter. The FPI is piezo-actuated and it uses three piezo-actuators in a closed capacitive feedback loop for air gap tuning. The FPI has multiple order transmission bands, which limit free spectral range. Therefore spectral imager contains two FPI in a stack, to make possible to cover spectral range of 1000 - 1700 nm. However, in the first tests imager was used with one FPI and spectral range was limited to 1100-1600 nm. The spectral resolution of the imager is approximately 15 nm (FWHM). Field of view (FOV) across the flight direction is 30 deg. Imaging resolution of the spectral imager is 256 x 320 pixels. The focal length of the optics is 12 mm and F-number is 3.2. This imager was tested in summer 2014 in an unmanned aerial vehicle (UAV) and therefore a size and a mass of the imager were critical. Total mass of the imager is approximately 1200 grams. In test campaign the spectral imager will be used for forest and agricultural imaging. In future, because results of the UAV test flights are promising, this technology can be applied to satellite applications also.

AB - VTT Technical Research Centre of Finland has developed a spectral imager for short-wave infrared (SWIR) wavelength range. The spectral imager is based on a tunable Fabry-Perot interferometer (FPI) accompanied by a commercial InGaAs Camera. The FPI consists of two dielectric coated mirrors separated by a tunable air gap. Tuning of the air gap tunes also transmitted wavelength and therefore FPI acts as a tunable band bass filter. The FPI is piezo-actuated and it uses three piezo-actuators in a closed capacitive feedback loop for air gap tuning. The FPI has multiple order transmission bands, which limit free spectral range. Therefore spectral imager contains two FPI in a stack, to make possible to cover spectral range of 1000 - 1700 nm. However, in the first tests imager was used with one FPI and spectral range was limited to 1100-1600 nm. The spectral resolution of the imager is approximately 15 nm (FWHM). Field of view (FOV) across the flight direction is 30 deg. Imaging resolution of the spectral imager is 256 x 320 pixels. The focal length of the optics is 12 mm and F-number is 3.2. This imager was tested in summer 2014 in an unmanned aerial vehicle (UAV) and therefore a size and a mass of the imager were critical. Total mass of the imager is approximately 1200 grams. In test campaign the spectral imager will be used for forest and agricultural imaging. In future, because results of the UAV test flights are promising, this technology can be applied to satellite applications also.

KW - hyperspectral sensors

KW - multispectral image sensors

KW - Fabry-Perot Interferometer

KW - Piezo actuators

KW - imaging spectrometer

KW - UAV

KW - airborne

KW - precision agriculture

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DO - 10.1117/12.2067206

M3 - Conference article in proceedings

SN - 978-1-6284-1304-5

T3 - Proceedings of SPIE

BT - Proceedings

PB - International Society for Optics and Photonics SPIE

ER -

Mannila R, Holmlund C, Ojanen HJ, Näsilä A, Saari H. Short-wave infrared (SWIR) spectral imager based on Fabry-Perot interferometer for remote sensing. In Proceedings : SPIE 9241, Sensors, Systems, and Next-Generation Satellites XVIII, 2014. International Society for Optics and Photonics SPIE. 2014. (Proceedings of SPIE, Vol. 9241). https://doi.org/10.1117/12.2067206