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Radiometry


Colorimetry Chemistry Optical Metrology Chemometry

 

Radiometry - Systems for General Lighting, LED, Laser, Display, Solar Irradiation

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Spectro-Radiometric Measurements
 
  • Measure the spectral output of just about any light or luminaire

  • Light Measurement Systems include a miniature spectrometer, a fiber optic cable (or direct attachment), a light collecting accessory/integrating sphere, and a NIST traceable intensity calibration

  • Real-time 1931 CIE Chromaticity diagram for xy Chromaticity, Dominant Wavelength, Purity, and Correlated Color Temperature (CCT)

  • Measure LED optical output in Luminous & Radiant Flux, spectral irradiance and LUX, microwatts/cm2, moles per second, PAR, Footcandles, CRI & CQS

  • Spectrometer configurations available to cover the 200-1700nm range

The StellarNet model spectrometers are great tools for low cost, routine analysis of all types of light. From measuring the irradiance of standard light bulbs to measuring the exact color coordinates of the yellow in a traffic light, StellarNet spectrometers are used worldwide to routinely analyze light. These instruments are calibrated to measure the spectral irradiance, radiance, or Watt flux over the wavelength range in nanometers provided by the selected spectrometer model.Currently, StellarNet offers Radiometer systems in the 200-1700nm range!

SpectraWiz Software can calculate many important values such as lumens, xy chomaticity, dominant wavelength, Correlated Color Temperature (CCT), and much more.

The the bottom of the page details the various ranges for each StellarNet Spectroradiometer. The BLUE and GREEN-Wave models, BLACK-Comet concave grating model, and RED-Wave-NIRInGaAs model can be configured to have the correct slit size and detector array to suite your application. Calibrated spectroradiometers can be used to measure absolute intensity, xy Chromaticity (CIE 1931), purity, correlated color temperature, and dominant wavelength.


Typical System consists of a BLUE-Wave Spectrometer, Fiber Optic Cable, 6'' Integrating Sphere, and a Radiant Flux calibration in Watts/nm
SpectroRadiometer Test Reporting Software
The SpectroRadiometer Test Report Software now enables customers to prepare and instantly display all of the relevant test data on one sheet making quality control and R&D efforts much more efficient. Instantly acquire a complete spectrum of your test light source and view its color distribution with an under the curve wavelength color representation. This spectral curve allows for easy identification of color distribution of your light source.
- Total Power (Watts and Lumens)

- Efficiency & Efficacy

- CIELAB with the xy/u’v’ chromaticity

- CCT (Correlated Color Temperature)

- PAR

- Dominant wavelength

- Percent color purity.

- CRI (Color Rendering Index)

- CQS (Color Quality Scale)

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More and more incandescent lights are being replaced by LEDs each day. LEDs have the advantages of increased efficiency, color specificity, size, response time, lifetime, and numerous other factors. StellarNet’s line of low cost miniature spectroradiometers are the perfect tool to analyze LEDs for both irradiant output, color, spectral profiling, and a handful of other useful values.

Spectrometers for LED Measurement
These miniature rugged spectrometers are calibrated to test LED optical output in Luminous & Radiant Flux, spectral irradiance and LUX, microwatts/cm2, moles per second, PAR, Footcandles, CRI & CQS. Currently, StellarNet offers LED measurement systems in the 200-2300nm range. A majority of StellarNet’s spectrometers can be configured for LED measurement including the BLUE-Wave, High Resolution, High Sensitivity SILVER-Nova, and DWARF-Star NIR spectrometer models. The spectrometers can additionally be calibrated with our NIST traceable lamps for absolute intensity to be used to capture LED intensity profiles and shape. Typically an integrating sphere such as the IC2 2? or IS6 6? or IS12 12? integrating sphere is used with a radiant flux calibration (RAD-CAL).

StellarNet LED Testing Solutions? – UV-VIS-NIR Ranges 200-2300nm – Low cost – Ruggedized high performance – Shock-proof – Permanently aligned – SpectraWiz Software included Free – Battery packs and handheld option for field measurements – USB-2 interface to all notebook PCs


Typical System consists of a BLUE-Wave Spectrometer, Fiber Optic Cable, 6'' Integrating Sphere, and a Radiant Flux calibration in Watts/nm

Visible LED Measurement Spectrometers
The StellarNet miniature spectrometers are fiber optically coupled instruments with a wide selection of models for LED measurements in 200-1150nm wavelength ranges. BLACK-Comet and BLUE-Wave models are both very popular with LED testing
Visible High Resolution (HR) and High Sensitivity (SILVER-Nova) Spectrometers
The HR spectrometers have double the resolution over standard models with the same grating. The wavelength range is reduced by the same factor. Resolutions better than 0.1nm can be achieved depending on selected model range, detector, and slit size. The SILVER-Nova and SILVER-Nova-TEC-X2 offer the highest sensitivity with Thermo electric coolers down 15 & 30 degrees respectively which increase detection capabilities for low light LED measurement.
Near-Infrared LED Test Spectrometers
The DWARF-Star and RED-Wave NIR spectrometers can be spectrally calibrated for NIR LED testing from 900-1700nm. StellarNet offers various optional ranges with increase spectral resolution. Likewise a NIR can be paired with a visible unit to give you broadband spectral analysis over the 200-1100nm range.

StellarNet low cost LED Measurement Systems reliably test LED optical output in Luminous & Radiant Flux, spectral irradiance and LUX, microwatts/cm2, moles per second, PAR, Footcandles, CRI & CQS


StellarNet offers LED testing systems for comparing LED Lumens, CCT, x,y chromaticity, dominant wavelength and hue for QC/QA in the field such as the StellarRad Handheld Radiometer


Laboratory & Research Quality LED Measurement Systems typically include a BLACK-Comet concave grating spectrometer (with optional TEC), optical fiber, and integrating sphere
SpectroRadiometer Test Report – Enables customers to prepare and instantly display all of the relevant test data on one sheet making quality control and R&D efforts much more efficient. Instantly, acquire a complete spectrum of your test light source and view its color distribution with an under the curve wavelength color representation.
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Low Light Configurations
Many popular applications involve measuring the irradiance of light sources with low output intensities. From ambient streetlight to UV-LEDs many people need to detect low levels of radiation. StellarNet spectrometers can be specially configured to measure these low light levels. The spectrometer aperture or slit can be adjusted to allow more light into the unit, thus making it more sensitive to radiation. For low light applications a 200um slit is the standard slit size. Additionally, low light level calibrations can be employed to further optimize the spectrometers ability to see low light levels. And lastly, a TEC cooler can be installed on the detector array to increase the signal to noise of the unit by 66%. This in affect allows the spectrometer to integrate over longer periods of time, collecting more and more photons, while keeping a low noise value. If you have a low light application be sure to discuss the configuration of your spectrometer.

Bright Light Configurations
In contrast, many industries require the measurement of really bright light emission. StellarNet spectrometers have a dynamic range of 6 decades allowing integration times from 1ms to 65s. StellarNet spectrometers can be specially configured for high power applications. The limitation of a high power radiometer will be limited by the power of the calibration source. StellarNet can configure Spectroradiometers to optimize calibration thus allowing the use of the units large dynamic range and detector linearity to allow high power light measurement. Additionally, smaller slits, fibers, and integration spheres can be employed to decrease the signal to the spectrometer. StellarNet offers a high light level calibration to further optimize the system performance.


SpectroRadiometer Sample Spectra  
   

SpectraWiz Software displaying 1931 xy chromaticity diagram measuring the color and Correlated Color Temperature (CCT) of an LED.

SpectraWiz Software allows the users to select the irradiance units. Additionally, scroll down menus allow the user to select their collection accessory in order to calculate radiant and luminous flux.
   

BLACK-Comet spectrometer calculating LUX values of a bright source. StellarNet spectroradiometers are all calibrated first with base units of irradiance in W/m^2. SpectraWiz software applies different factors and algorithms in real-time to calculate your favorite comparison value (e.g. Lumen, footcandle, CCT, etc).


Dual DSR Spectroradiometer
Halogen-lamp spectra (300-1700nm). StellarNet Dual DSR system pictured above uses a Y bifurcated fiber (F600-Y-UVSRNIR) to connect a BLACK-Comet-SR spectrometer and a RED-Wave NIR Spectrometer. The entire system can be radiometrically calibrated over the range 200-1700nm. Above system pictured with Flash Capture Interface (FCI) that allows spectrometer to capture emission from flashing sources such as flashtubes and pulsed solar simulators.

LED Measurement Sample Spectra  
   

BLACK-Comet concave grating spectrometer for LED measurement capturing spectrum of Nichia White LED (190-850nm or 280-900nm). SpectraWiz software displays 1931 CIE Chromaticity Diagram with xy chromaticity values within .001 of LED specifications. Also displayed is LED dominant wavelength, purity value XYZ tri-stimulus values. SpectraWiz software allows the user to save samples, log data, auto-scale, and take dark references.

BLACK-Comet-SR concave grating spectrometer for LED measurements displaying irradiance values in Lumens as well as correlated color temperature (CCT). Choose model C-SR (200-1080nm) or CXR-SR (220-1100nm)

*Note only Concave grating spectrometers can be NIST calibrated for deep UV (IRRADUV-CAL) and VIS (IRRAD-CAL) measurements simultaneously.




BLACK-Comet spectral overlay of UV LEDs tested for our SL1-LED UV kit. In order to choose the best LEDs for fluorescence excitation it is required that the StellarNet R&D test all incoming LEDs for wavelength and absolute intensity as compared to the manufacturers specifications.


BLUE-Wave-VIS model miniature spectrometer can be calibrated for irradiance measurements also. The spectrometer has a range from 350-1150nm and can be calibrated for irradiance measurements (IRRAD-CAL). BLUE-Wave spectrometers have the advantage of being smaller and powered by USB; however, lack the benefits of research grade concave grating optics. Contact me to determine the best spectrometer for your LED analysis.