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BLACK-Comet UV-VIS Spectrometer (with Research Grade Concave Grating Optics)

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Research Grade Spectrometer
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  • Measurements in the 190-850nm or 280-900nm ranges
  • High performance concave grating optics for UV-VIS applications
  • Superb spectral imaging with no mirrors for lowest possible stray light
  • Enhanced UV Sensitivity & Flat-field imaging for uniform resolution
  • No optical adjustments for extreme thermal stability and ruggedness
  • Thermo-electrically Cooled Detector (TEC) upgrade increases S/N by 60%
  • BLACK-Comet-SR (Super Range) for wide range applications 200-1100nm
  • BLACK-Comet-HR (High Resolution) for high resolution applications <0.4nm

Sample Spectra SpectraWiz Software Spectragryph Software Popular Accessories

Detector TEC Upgrades

StellarNet BLACK-Comet concave grating spectrometers deliver high performance spectral analysis in the UV-VIS-NIR wavelength range covering 190-850 (model C-SR) or optionally 280-900nm (model CXR).

Research Grade Optical Performance – The BLACK-Comet UV-VIS-NIR spectrometers utilize a Dual Blaze 40mm diameter concave grating with aberration correction to provide the best optical performance of any compact spectrometer on the market.

  • Improved spectral shapes by reducing comma and astigmatism found in plane grating spectrograph designs.
  • Stray light reduction - The spectrograph architecture does not utilize mirrors, and therefore provides the lowest possible stray light, which is especially helpful for UV applications.
  • Enhanced sensitivity - due to the spectrometers ability to reduce light scatter, especially high power UV light, the BLACK-Comet provides two to three times enhanced UV sensitivity as compared to plane grating/Czerny Turner optical configurations.
  • Uniform resolution – The concave grating produces a flat field on the CCD detector creating uniform resolution over the entire spectral range.
  • Thermal Stability - Optical bench architecture without mounting turrets and optical posts (typically in most USB spectrometers) decreases thermal expansion and contraction and increases overall system performance with temperature change

BLACK-Comet Optics- The concave holographic grating is aberration corrected and has no mirrors to minimize stray light with superb imaging projecting a flat field on the detector

Dual blaze super range models provide wide wavelength ranges. Choose from the tables of standard models with various slit options for your choice of slit resolution. New and improved electronics with a high speed 16-bit digitizer allows for fast data acquisition and a signal to noise of 1000:1!

Ruggedized – The detachable spectrograph assembly and control electronics are protected inside a rugged metal enclosure, suitable for portable, process, lab, and field applications.

Multi-unit connection (up to 8) can be daisy chained together and are able to run simultaneously.

USB Powered – BLACK-Comet-SR UV-VIS-NIR spectrometers can be powered directly from your PC’s USB-2 port. A single strand fiber optic cable or probe assembly delivers input via standard SMA 905 fiber optic connector with a choice of cable lengths.

Onboard Memory with pre-set calibrations and spectrometer settings and snap shot memory to provide instantaneous spectral image from the highly sensitive CCD with 2048.

High Speed Electronic Interface can be attached directly to a computers USB port for high speed data transfer. Options for Wifi/ethernet communication available as well as other interfaces. ContactUs@StellarNet.us for more info.

Detector TEC Upgrades

BLACK-Comet Model
Wavelength Range (nm)
Slit - 200µm
nm resolution
Slit - 100µm
nm resolution
Slit - 50µm
nm resolution
Slit - 25µm
nm resolution
Slit - 14µm
nm resolution
190 - 850
280 - 900
Detector TEC Upgrades


BLACK-Comet Spectrometers from $2950 / €2490
Dynamic Range: 2000:1 with 6 decades Dimensions: 69 x 100 x 150 mm
Optical Resolution: < 1 nm Resolving Res. with 25um slit Power consumption: < 100 mA via USB port
Detector Type: 2048 pixel CCD, PDA opt. Interface: USB-2
Detector Range: C=190-850nm or CXR=280-900nm Data Transfer Speed: 3x / 40x faster than USB-1
Pixel Size: 14 x 200 µm Detector Integration: 1ms to 65s
Concave Grating: Abberation corrected Slit size options: 14, 25, 50, 100, 200um
Grating Type: Holographic, 590 lines/mm Stray light: 0.02% at 435nm; 0.2% at 200nm
Spectrograph: f/2, Flat field – No mirrors Fiber optic input: SMA905 0.22 NA single fiber
Order Sorting Filters: Integrated multi-band Operating systems: Win XP, Vista, 7, 8, & 10
Signal to Noise: 1000:1 CCD, TEC Options Software included: SpectraWiz program & apps
Digitizer: 16-bit Also free programs for: LabView, Excel+VBA, Delphi

BLACK-Comet TE Cooler upgrades reduce the temperature of the CCD to 15 degrees below ambient and increase instrument S/N by 60% at long exposures, improving low light measurement quality for fluorescence and other weak emission applications. In order to achieve low temperatures the TEC add-on includes a new sealed and isolated detector enclosure with specialized heat sink and air flow design for added stability and cool operation. TEC Upgrade Price – $1,650

Detector TEC Upgrades

BLACK-Comet TE Cooler upgrades reduce the temperature of the CCD to 15 degrees below ambient and increase instrument S/N drastically by reducing noise over 50% at long exposures. This upgrade improves the compact spectrometer’s measurement quality and makes it a perfect solution for fluorescence and other weak emission applications. In order to achieve low temperatures the TEC add-on includes a new sealed and isolated detector enclosure with specialized heat sink and air flow design for added stability and cool operation.

TEC Upgrade Price -> $1,650

Low light spectral measurement of a dim backlit LED display. The display measurement is performed with a BLACK-Comet-TEC spectrometer with the thermo-electric cooler ON and OFF at a 30 second exposure time. The background noise is drastically reduced, increasing instrument detection capabilities.

BLACK-Comet Sample Spectra  

Optical Metrology and Colorimetry
BLACK-Comet UV-VIS spectrometer model CXR-25 (-25 denotes slit size) measuring the transmission of a blue plastic film using a SL1 tungsten halogen lamp, TXF-4 transmission fixture, and two F600-VIS-NIR fiber optic cables and providing colorimetric data in CIELAB color space. Go to the colorimetry page.

Solar Irradiance Monitoring XXX
BLACK-Comet-SR in DSR-CSR-512 system measuring solar irradiance. The dual blaze concave grating allows for superb spectral imaging from 220-1100nm.

BLACK-Comet Sensitivity
Spectral sensitivity is one of the most important factors in choosing the proper miniature spectrometer. The concave grating optical design allows for high sensitivity and a smooth spectral distribution over the wavelength range as shown in the above spectrum of a Tungsten Halogen lamp.

UV-VIS Absorbance System
StellarNet’s Low Cost UV-VIS Spectrometer system is composed of the BLACK-Comet research grade concave grating spectrometer, a SL5 high stability light source with integrated cuvette holder, and an optical coupling fiber. Above is the absorbance spectrum of various sugars.

BLACK-Comet Options

JACK 1-In Trigger
TTL input trigger to enable spectrometer scan $100

Optional Configurations
Units may be daisy chained via USB-2 hub allowing simple configurations for dual and multi-beam process applications. 8 BLUE-Wave spectrometers can be operated at once!

BLACK-Comet Interfaces

The system includes a high speed plug & play interface using USB-2 connection.

StellarControl™ Device
Enables PCs with WiFi to run all StellarNet spectrometers attached to the kit, which may optionally be battery powered. SCD converts USB to Ethernet that feeds high speed WiFi wireless router (not included). Works on WinXP, Win 7-32bit and Win7-64bit.

Systems / Applications
  • SpectroRadiometry
  • Colorimetry
  • SpectroChemistry Systems
  • Optical Metrology
  • Fluorescence Spectroscopy
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