Measuring Efficient Light Usage in plants with a Field Spectroradiometer

spectral measurements from a field spectroradiometer

 DARWin SP software includes 19 popular vegetation indices

Lawrence, MA, USA – When used with spectral measurements from a field spectroradiometer such as the PSR+ from Spectral Evolution, the Photochemical Reflectance Vegetation Index (PRI) and Red/Green Vegetation Index (Red/Green) can provide researchers with important data on the ability of vegetation to efficiently use sunlight for photosynthesis.

This data can provide a picture of plant health including an assessment of plant stress.

One of the 19 vegetation indices offered with DARWin SP Data Acquisition software and the PSR+ field spectroradiometer, PRI looks at the carotenoid pigments, especially the xanthophyll pigments absorbed by plants.

The pigments can signify growth rate and biomass production. PRI uses the wavelengths of light from 400 to 700 nanometers and has a measurement range of -1 to 1 with healthy vegetation falling between the values of -0.2 to 0.2 in the PRI index.

In addition to PRI, the PSR+ with DARWin SP includes the Red/Green Index for growth cycle studies, stress detection of canopies, and prediction of potential crop yield.

The Red/Green Index measures the expression of leaf redness caused by anthocyanin to the green caused by chlorophyll. It can be used as an indication of leaf production and/or stress. The means of the bands in the red range are divided by those in the green range.

The typical range for green vegetation is 0.7 to 3.

DARWin provides access to the following Vegetation Indices:

  • GRVI (Green Ratio Vegetation Index)
  • SR (Simple Ratio Vegetation Index)
  • DVI (Difference Vegetation Index)
  • SAVI (Soil Adjusted Vegetation Index)
  • Red/Green (Red Green Ratio)
  • ARVI (Atmospherically Resistant Vegetation Index)
  • Green NDVI (Green Normalized Difference Vegetation Index)
  • EVI (Enhanced Vegetation Index)
  • MSAVI2 (Modified Soil Adjusted Vegetation Index Type II)
  • IPVI (Infrared Percentage Vegetation Index)
  • Sum Green (Summed Green Vegetation Index)
  • PRI (Photochemical Reflectance Index)
  • NDVI 705 (Red Edge Normalized Vegetation Index)
  • WBI (Water Band Index) NDWI (Normalized Difference Water Index)
  • PAR (Photosynthetically Active Radiation)

These vegetation indices can be used with our field units to confirm or correct hyperspectral imagery with ground truthing or as part of a grid approach to mapping and measuring an area, for example, a crop field.

For more information:

Or, to speak with a Technical Specialist:


Established in 2004, SPECTRAL EVOLUTION is a leading manufacturer of laboratory and handheld portable spectrometers, spectroradiometers and spectrophotometers. SPECTRAL EVOLUTION spectrometers are used worldwide for many mission-critical lab and field applications in mining, remote sensing, vegetative studies, ground truthing, environmental and climate studies, developing satellite calibrations, and more, due to their reliable, robust, rugged design and user-friendly one-touch features.

Press contact

Mo Kashdan
Marketing & Sales


1 Canal Street, Unit B1
Lawrence, MA 01840 USA

Zoom Lens Enables Safe Viewing of Nuclear Fuel Assembly

custom UV zoom lens

Chesham, UK  —  Resolve Optics Ltd. is supplying a North American camera manufacturer with small batches of a custom UV zoom lens enabling safe remote viewing of nuclear fuel assemblies through 10 metres of water.

To meet the challenges of this difficult application – the UV zoom lens was designed to optimally operate from 10 to 55 ºC.

Miniature motors were incorporated to allow accurate remote setting of both zoom and focus functions. A filter slide was incorporated in the design enabling the lens to be switched between UV (270 to 350 nm) and visible (400 to 700 nm) without the need to refocus the lens.

Using a telescopic focus the lens was able to image objects from 13 metres to infinity with optical correction for 10 metres of water. The lens achieved high image resolution with low distortion throughout the zoom range without refocusing (image tracking).

Top-siding adjustment was provided on the lens so that the motor cables could be conveniently positioned.

A unique lockable C-mount was incorporated into the design to ensure that the lens would not come loose during operation.

For further information please contact Resolve Optics Ltd. on +44-1494-777100 or

Resolve Optics ( has developed the rare capability to produce small production quantities of high performance, mounted lenses with the professional look, feel and quality equivalent to the best professional photographic and broadcast TV lenses. Over the last 30 years, Resolve Optics Ltd. have developed market leading applications expertise in a range of areas – most notably industrial machine vision, aerospace, broadcast TV, instrumentation, security and the nuclear industry.

Worldwide HQ

Resolve Optics Ltd.
Asheridge Road
Bucks. HP5 2PT

tel: +44-1494 777100

Ultra High-Speed Imaging of Fracture & Crush Tests

 Kirana ultra high speed video camera

Tring, UK  —  Specialised Imaging reports on customer feasibility tests published on YouTube using its Kirana ultra high-speed video camera.

The movies ( show various impact fracture and crush tests performed on ceramic, plexiglass and polycarbonate plates taken at 5, 2 and 1 million frames per second using the Kirana ultra high speed video camera. Continue reading

NEW AICON 3D Studio version 11

New languages, Windows® 10-compliant

21_AICON_3D_Studio_kleinBraunschweig/Germany – The AICON 3D Studio version 11 now offers still more advantages!

Microsoft® Windows® 10 is on the market since the end of July 2015.

To make the AICON 3D Studio fit for the future, AICON has adapted the software to the altered requirements of the Windows® release. The new software is Windows® 10-compliant!

The newly released version 11 features a clearer and more flexible layout. Continue reading

Unlocking The Mechanism of Plasma Modification of Polymer Films

With Ultra Fast UV Imaging


Plasma Image Courtesy INP Greifswald

Tring, UK — Specialised Imaging reports on how the Leibniz Institute for Plasma Science and Technology eV is using an optimised version of its SIM Framing Camera to make ultra fast UV measurements of the mechanism of plasma being used to modify the electrical properties of polymer films.

The Leibniz Institute for Plasma Science and Technology eV (INP Greifswald) is the largest non-university research institute conducting basic research into and investigating the applications of low temperature plasmas.

In addition to the application-oriented basic research, the INP Greifswald promotes the development of plasma-supported processes and products. The Institute conducts research and development from idea to prototype. Continue reading

Measure the advantage!

25 years of AICON 3D Systems GmbH

AICON_LogoBraunschweig, Germany – Optical, camera-based 3D metrology has become a standard in many industrial areas. Far more than 4.000 of the installed 3D measuring systems worldwide are from AICON 3D Systems.

For 25 years now, the company has developed, manufactured and supplied 3D metrology for various applications.

“In the first place, we wanted to name our company ICON. That sounded fitting, as the word means ’image‘ in Greek. Because of trademark issues, it wasn’t possible; an image processing company already carried that name. However, we liked the sound of the word. We simply put an A in front: AICON. The sound is the same, and it has an advantage: We are always on top in alphabetic company lists.”

Continue reading

NEX instruments from ZEISS Industrial Metrology adds new detectors


SURFCOM NEX 100 for additional measurement analysis (PRNewsFoto/ZEISS Industrial Metrology)

MAPLE GROVE MN, USA  — /PRNewswire/ — The NEX series of instruments from ZEISS Industrial Metrology integrate additional measurement analysis with their new detectors.

SURFCOM NEX 100 offers a single hybrid detector to measure surface texture and contour at the same time.

RONDCOM NEX Rs offers best-in-class spindle accuracy and allows optional surface roughness measurements in the horizontal, vertical and radial axes.

Pair your preferred surface texture & contour detectors with SURFCOM NEX 100
Continue reading