WS400

High-Sensitivity Compact Spectrometer

The compact high-sensitivity spectrometer WS400 is developed for low-light applications such as measurements of Raman scattering, fluorescence, etc., that require especially high sensitivity or enhanced specifications in the UV spectral range. 

Key Features:

  • Up-to-date model based on back-thinned arrays for operation with low signals

  • Enhanced UV sensitivity

  • Monolithic housing for optimum stability

  • Internal light traps to reduce stray light

  • Flexible configuration, including a choice of Diffraction gratings, spectral ranges and resolutions tailored to your requirement

  • User-friendly interface compatible with Windows XP, Windows 7, 8 and 10

  • The high-aperture optical bench of the WS400 has no moving parts and minimizes the number of reflective surfaces. The WS400 features a monolithic housing, thus ensuring long-time measurement stability. The case has internal fins (light traps) that allow reducing stray light – a typical problem of compact short-focal length instruments.

    The WS400 may contain as a detector either one of two non-cooled Hamamatsu back-thinned CCD-arrays without a charge-storage section (back-thinned FFT CCD), operating in the binning mode. Both arrays have wide spectral range and excellent sensitivity in the UV (see below for the curves of each detector spectral sensitivity and their specifications). These two arrays differ in quantum efficiency, data reading rate, dynamic range, and in pixel active area size.

  • Upon request, the WS400 spectrometer can be optionally calibrated for spectral sensitivity.

    Available calibration ranges:

    • Cal-UV: 220–400

    • Cal-VIS: 300–1050 nm

    Calibration is carried out using certified light sources—a deuterium lamp for the UV range and a halogen lamp for the VIS range. It is performed via fiber input and remains valid for one year, provided the optical fiber remains connected. Calibration accuracy is ±10%.

Ws400 TECHNICAL FEATURES:

    • Spectral range, nm: 190 — 1100

    • Focal length, mm: 125

    • F/number: 1 : 3,9

    • Entrance slit (one to choose): fixed width: 14μm, 30μm and 50 μm

Detection & Image Sensors

Spectral resolution: depends on selected diffraction grating (see table below)

Image Sensors model S10420-1106-01
Hamamatsu		 S16010-1106
Hamamatsu		 S7030-1006
Hamamatsu
Number of pixels 2068 × 70 1024 × 64
Number of active pixels 2048 × 64 1024 × 58
Pixel size, μm 14 × 14 24 × 24
Active area size, mm 28.672 × 0.896 24.6 × 1.4
Maximum spectral sensitivity, nm 500 700 650
Maximum quantum efficiency, % >75 >90
Non-uniformity of sensitivity 1), % ±3 ±3
Anti-blooming 2) Yes No
ADC Resolution 16-bit, 250 kHz 16-bit, 125 kHz
Mean-square reading noise, ADC counts <4 <2
Dynamic range (binning mode) ~16000:1 ~33000:1
Exposure time, s 0.0083–10 3) 0.0082–2 3)
Frame processing time in the binning mode, ms 9.39 9.12
Thermoelectric cooling No
Operating temperature 10–30 °С

1) Signal level ≥ 50% of saturation.
2) Anti-blooming – sensor’s feature eliminating overflow of charges from over-exposed pixels to the neighboring ones.
3) Maximum storage time is deemed to be the time at which dark signal reaches 25% of the dynamic range at the ambient temperature +25°С.

Diffraction Grating

Diffraction grating, grooves/mm 1800 1200 900 600 400 300 200
Spectral range of grating operation, nm 190 – 600 190 – 900 190 – 1100 190 – 1100 190 – 1100 190 – 1100 190 – 1100
Multichannel array bandpass (average), nm 105 2)
92 3)		 170 2)
145 3)		 230 2)
200 3)		 350 2)
300 3)		 540 2)
460 3)		 720 2)
620 3)		 1000 2)
920 3)
Reciprocal linear dispersion (average), nm/mm 3.8 6.0 8.2 12.5 19.0 25.4 38.0
Spectral resolution (average), nm 1) 0.16 2)
0.22 3)		 0.25 2)
0.36 3)		 0.34 2)
0.5 3)		 0.5 2)
0.75 3)		 0.8 2)
1.1 3)		 1.0 2)
1.5 3)		 1.6 2)
2.3 3)

1) For 300nm wavelength.
2) For Spectrometer with S10420-1106.01 and S16010-1106 image sensor models.
3) For Spectrometer with the S7030-1006 image sensor model.

    • Triggering: internal / external

    • PC connection: Full Speed USB

    • Optical input:
      — Direct radiation input to the entrance slit
      — Optical Fiber : 0.6 (0.4)mm diameter, 1m length, SMA-905 connector ( As an option)

    • Dimensions, mm: 158 × 182 × 74

    • Weight, kg: 2.2

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