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Color Measurement
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SpectraRad™ Xpress
| Power Input | USB at < 350 mA | |||
| Detector Type | Response enhanced 2048 element linear silicon CCD array | |||
| Detector Pixel Format | 2048 x 1 elements @ 14μm x 200μm per element | |||
| Spectrograph F# | 3.0 | |||
| Spectrograph Optical Layout | Crossed Czerny-Turner | |||
| Dynamic Range | 275 typical | |||
| Digitizer Resolution | 16-bit or 65,535:1 | |||
| Readout Speed | 500 kHz | |||
| Data Transfer Speed | Up to 180 spectra per second via USB 2.0 | |||
| Effective Integration Time | 1 to >=20,000 ms | |||
| External Trigger | Aux Port | |||
| Operating Temperature | 15°C - 35°C | |||
| Relative Humidity | 0 - 85% RH non condensing | |||
| Weight | ~0.23 kg (0.5 lbs) | |||
| Dimensions | See Drawings | |||
| Computer Interface | USB 2.0/1.1 | |||
| Operating Systems | Windows XP, Vista (32-bit), & 7 (32-bit) | |||
The groove frequency of the grating determines two key aspects of the spectrometer’s performance: the wavelength coverage and the spectral resolution. The higher the groove frequency the more resolution the instrument will achieve but the wavelength coverage will be less. Inversely, decreasing the groove frequency increases wavelength coverage at the cost of spectral resolution. With over twenty-five gratings to choose from we can customize the spectrometer to suit your application needs.
The blaze angle or blaze wavelength of the grating is also a key parameter in optimizing the spectrometer’s performance. The blaze angle determines the maximum efficiency the grating will have in a specific wavelength region. We have a variety of blaze angles available per groove frequency to match your application needs.
| Best Efficiency |
Spectral Coverage (nm) |
Ordering Code |
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| UV / NIR | 200 - 850 | AG02 | |
| Vis | 380 - 750 | AG06 | |
| Vis / NIR | 350 - 1050 | AG03 | |
| Custom Configurations Available | |||
The Quest™ X features a non-cooled 2048 element linear silicon CCD array detector with a pixel format of 2048 x 1 elements @ 14μm per element with effective (active) pixels > 2000. Each pixel represents a portion of the spectrum and as the dispersed incident light strikes the individual pixels across the CCD the electronics can then translate and display the intensity using our BWSpec™ software.
The quantum efficiency (QE) and noise level of the array detector greatly influences the spectrometer's sensitivity, dynamic range and signal-to-noise ratio. The spectral acquisition speed of the spectrometer is mainly determined by the detector response over a wavelength region.
| Specifications | |
| Wavelength Range | 200nm - 1050nm |
| Pixels | 2048 |
| Pixel Size | 14μm x 200μm |
| Well Depth | ~65,000 e |
| Digitization Rate | 500 kHz |
Although filter based instruments are desired for certain properties such as cost, speed and portability, they are not always the best choice for analytical measurements. Filter based instruments only acquire three data points across the entire spectrum of light to yield colorimetric values. This is accomplished by the use of filters corresponding to the normal human eye response. These filters can only be manufactured to a certain degree of accuracy. Due to these facts, filter based meters are susceptible to errors because of the deviation of the filter response from the ideal human eye response and the lack of resolution needed to accurately describe narrow bandwidth light sources.
The SpectraRad™ avoids these problems at a comparable cost, higher speed and small footprint because it acquires hundreds of data points across the visible spectrum. In addition, the 2048 pixel linear CCD array provides the precision required to accurately measure narrow bandwidth light sources or LEDs. Having multiple sensors also enables the unit to report spectral data and display spectral graphs, making it the ideal instrument for evaluating LEDs, which are today’s dominant light source.
B&W Tek, Inc. also offers an optional CIE 127 adaptor for LED characterization.
SpectraRad™ Xpress Miniature Spectral Irradiance Meter
The SpectraRad™ Xpress is a miniature Spectral Irradiance Meter designed for field, industrial, and lab applications with a plug-and-play USB 2.0 interface. A transmissive cosine corrector is coupled to a spectrometer which then is irradiance calibrated against a NIST traceable tungsten light source. Optimized software is provided for characterization and measurement of many application lighting devices and systems. Standard software features include timeline recording, data smoothing, illuminance (lux), chromaticity, color temperature, external triggered pulsed light capturing, and other data handling functions. The SpectraRad™ Xpress is ideal for lamp and LED characterization (requires input optic option), and color analysis, solar studies, photostability testing, photobiology and photochemistry.
