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VIS-NIR-DR spectrometer | SIMTRUM Photonics Store

Products / Light Analysis /Spectrometers /FT Infrared Spectrometer(900-16000nm) /VIS-NIR-DR spectrometer(360-2500nm) /
VIS-NIR-DR spectrometer(360-2500nm)
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SIMTRUM'S VIS-NIR-DR spectrometer is a broadband instrument designed for diffuse reflectance measurements in the visible and near-infrared. VIS-NIR DR combines two spectrometers: a standard multichannel grating spectrometer that covers the visible spectral range (360nm-950nm) and NIR scanning Fourier-transform spectrometer with an extended range InGaAs detector (900 to 2500 nm). Both spectrometers are connected to a 5 cm, internally illuminated integrating sphere which ensures illumination of the sample by perfectly diffuse light.

The VIS-NIR DR allows you to measure the reflectivity of materials and paints over the complete solar spectral range - from 360 to 2500nm. This is important for the painting, building or solar energy industries, because it provides crucial information about the solar energy absorbed and transformed into heat by those materials or paints.

Designed for ease of use, our dedicated software merges the information delivered by the two instruments and outputs a single spectrum covering the 350-2500nm interval. This software also features a direct calculation of the total solar reflectance (TSR) value for reference measurements.

Features

  • Large wavelength range（360-2500nm）
  • Grating spectrometer & FT-NIR combined
  • Internally illuminated integrating sphere
  • High resolution < 5nm
  • Fast acquisition time (5 s)
  • Direct calculation of TSR value

Principle

The VIS-NIR DR spectrometer combines a multichannel grating spectrometer, covering 360nm-950nm, with a scanning Fourier-transform spectrometer with an extended range InGaAs detector, which is sensitive in the NIR range from 900 to 2500 nm. Both spectrometers are connected to the internally illuminated integrating sphere via a bifurcated optical fiber.

The use of an Fourier transform spectrometer for the NIR and a grating spectrometer for the VIS is the optimal solution for diffuse reflection measurements:

For the VIS range it is preferable to have high sentivity because of the decreasing intensity of the halogen lamp in particualr for wavelengths below 450nm. So a grating spectrometer is the most adequate choice for this spectral range.

For the NIR spectral range, the Fourier-transform scanning spectrometer is superior to gratings spectrometer. Indeed, multichannel grating spectrometers are based on diode arrays with defective pixels and other problems. These problems are particulary important in the long range NIR (up to 2.5 microns) where InGaAs arrays suffer from severe technical limitations.

 

Applications

Total solar reflectance (TSR)

Lowering our need for energy and reducing our carbon footprint are crucial objectives for our future. Houses must be as energetically autonomouns as possible, which has to be achieved with a well engineered energy balance, and good thermal insulation. Solar radiation participates to this energy balance. In some situations, such as in cold countries, one may want the solar radiation to be absorbed as much as possible to help heating the building. In warm countries, converesely, a highly reflective surface is preferable.

However, is the reflectivity measurement in the visible range of the solar spectrum sufficient to asses the overall reflectivity of a surface?

As illustrated in the graph below, more than half of the enegy of the solar spectrum lies in the near-infrared (NIR) between 700 and 2500nm. This radiation participates to the heating, and must therefore be taken into account.

In order to give a standard comparison between the reflectivity of different surfaces, that takes into account the whole solar spectrum, a standard parameter called Total Solar Reflectance (TSR) has been introduced. Essentially, the TSR is a reflectivity weighted by a standardized solar spectrum (see ASTM ® norms G173 and E903):

The following figure illustrates the VIS-NIR reflectivity spectrum of two different paints. Their reflectivity of both paints is the same in the visible range, but it is considerably different in the NIR range. Hence, although these two paints would look identical to the human eye, one of them will absorb more solar radiation than the other.

The VIS-NIR DR SPECTROMETER was expressely developed to measure the TSR. It does cover the whole spectral range from 360 to 2500nm, and it is a fast, reliable, easy to use and comparatively low-priced instrument.


General Specifications

Model LA-AR01-VIS-NIR-DR
  Spectral range [nm] 350-2500nm
  Resolution [nm] ＜5
  Measurement geometry Diffuse illumination, 8°viewing angle
  Integrating sphere diameter [mm] 50
  Integrating sphere port diameter [mm] 10
  Illumination source Halogen, 5W
  Single acquisition scanning time [s] ＜5
  SNR ＞1000:1
  Inter-instrument repeatability ±1% at 50% R
  Repeatability on white reference ＜0.2% variation at 50% R

 

Other Specifications

  Software interface Windows 7/10/11
  Operating power 20 W @ 12 VDC
  Communication interface USB 2.0
  Dimensions [mm] 380×250×320
  Weight [kg] 8
  Operating temperature [℃] 10-40

 


We fully appreciate and value the multiple benefits that a dedicated, performant and reliable software can bring to your application. Automatic data collection, parameters changes, status diagnosis and many other essential tasks should be implemented as simply and as efficiently as possible in order to get the most out of your spectrometer. This philosophy led to the development of a multi-threading, cross-platform and versatile software application, the digital acquisition system or AoDAQ.

The AoDAQ simultaneously takes care of:

1. Handling communication with the FT-IR via USB

2. Processing raw signals to deliver a spectrum

3. Running a TCP Ethernet server

The AoDAQ can be installed on all sorts of computers, from desktop machines to embedded, low-power single board computers. Thanks to the hosting of a TCP server, the instrument data and parameters can be accessed locally and/or remotely. All communication with the instrument eventually reduces to a set of TCP/IP commands that allow to quickly acquire data, adjust parameters, monitor the instrument status etc. using the programming environment of your choice. 

 


Related products

Model Wavelength Range Resolution Detector  
  FT-NIR spectrometer 900-2500 nm 2/4/8 cm-1(user selectable) Extended type InGaAs PIN photodiode, 2TE cooled
  FT-MIR spectrometer 200-16000 nm 0.5/2/4/8cm-1(user selectable) MCT (4-TE cooled)
MCT (LN2 cooled)
DLATGS
  Fiber coupled FT-IR spectrometer 200-16000 nm 2/4/ 8cm-1 (user selectable) InGaAs (2-TE cooled)
MCT (4-TE cooled)
MCT (LN2 cooled)
  VIS-NIR-FIB spectrometer 350-2500 nm <1.5 nm silicon array detector (3648 pixels) 16-bit ADC.extended range InGaAs photodiode, 2TE cooled, 24-bit ADC.
  VIS-NIR-DR spectrometer 360-2500 nm 5 nm Extended range InGaAs detector

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LA-AR01-VIS-NIR-DR
Spectral range：350-2500nm,Resolution：＜5nm,SNR：＞1000:1,Single acquisition scanning time：＜5s 		4-6week $35200.00

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