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傅立叶变换光谱仪
Fourier Transform Spectrometer
商品货号:ECS000349
商品品牌:北京超立方科技公司
PDF 文档: Download傅立叶变换光谱仪details Document
详细介绍

The Arcspectro HT is a static Fourier transform spectrometer (FTS) that is based on a licensed concept that uses the polarization properties of the light and the optical properties of crystals). It provides a extremely high throughput (sensitivity) and does not need external optics to be used. The Arcspectro HT is ideal for the measurement of low light, diffuse reflection and also in fields like fluorescence or Raman spectroscopy。

 

What makes the ARCspectro-HT spectrometer so exclusive?

high sensitive spectrometerARCspectro HT is ideal for low light applications or for the spectral analysis of diffusing light sources (or samples). Its unique design permits to gather a maximum of light over a large diffusing surface (several millimeters!) and over a large angle (±10°). This gives a tremendous throughput advantage (~100x more) compared to the most powerful grating spectrometers (also well-known Jaquinot advantage) which are intrinsically limited by a small entrance slit (typically 0.025mm). This makes this unique device ideal for applications were small light intensities has to be analyzed (fluorescence or Raman spectroscopy).

Compared to conventional grating spectrometers, The arcspectro-HT (and all the other FT spectrometerrs) has many advantages. The most important is its a high resolution (0.。 Also FTS do not need second and third order rejection filters on the detector which causes spectral distortions and absorptions.7 nm @ 500nm) for a broad wavelength range (400nm-1000nm) and for an entrance aperture of 4mm

Another important advantage thwith the light to be spectrally analyzed. There is no need for cumbersome and expensive optics for coupling the light into a small optical fiber as it is the case for conventional grating spectrometers. Also, if necessary, the light can be directly injected in the arcspectro-HT via a thick light guide that is connected to the entrance.e arcspectro-HT is the simplicity of the optical setup: The user can directly illuminate the 4mm entrance window 

 

Features ARCspectro HT
Spectral range 400 nm – 1050 nm
Signal-to-Noise (single measurement full detector dynamic used, Ratio between the peak value and bottom value of HeNe Spectrum) 1000:1 (Multiplex advantage)
Spectral Resolution < 1 nm @ l = 550 nm
Detector type Silicium CCD front illuminated detector array
Full-well detector capacity 30'000 e-
Dark noise 2-3 counts RMS over a total of 4096 counts
Detector sensitivity ~15 photons per count
Relative wavelength fluctuation (measured with HeNe over 1 hour) < 0.01 nm
Absolute Wavelength Accuracy < 0。5 nm
Operating Temperature 10°C – 50°C
Wavelength Drift with temperature 0.01nm per °C
Measurement time 1 ms  to  "infinite"
Operating Voltage USB powered
Light guide core diameter (optional) 4 mm
Entrance aperture 4 mm (Diam.)
Communication Interface USB
Software Interface Windows XP, Labview
CCD Readout Sampling rate 0.5 MHz
A/D converter 12 bits
Product Dimensions (including electronics) 15cm x 10cm x10cm
Product Weight 300 g

Software

The ARCspectro HT series is delivered with a free windows XP,98,2000, compatible program.
The software recognize automatically the spectrometer (USB plug and play system) and
is able as other conventional spectrometer software to:

  • Display real time spectral measurement results
  • Configure measurement parameters (integration time, averaging).
  • Choose Transmission or Reflection mode
  • Usual features such as save, open, zoom, rescale...
  • Some specific features related to Fourier transform spectrometry: choose apodization (automatic recognition option), look and save the interferograms.

On demand application specific features can be implemented in the program within a few weeks. .

Also free Labview Vi's for driving the spectrometer are available on demand.

Accessories:

The ARCspectro HT is available with four different "light inputs" possibilities depending of the application and the type of light source to be analyzed:

  • Glass window: The spectrometer module can directly be placed in front of an extended diffusing source or for a point source. This solution presents minimal losses when looking with diffusing sources
  • Diffusing window: One can directly shine onto the diffusing plate. This solution is ideal for collimated sources
  • Single branch light guide: Ideal when the source is not directly accessible.
  • Dual branch light guide: Ideal for reflection measurements

How does it works?

  The ARCspectro HT series is static (so no moving scanning parts) FTS based on a so-called common path polarization interferometer。 The hart of Arcspectro HT is a monolithic bloc constituted of high-end crystal prisms and polarizers that are transparent over a very large spectral band (UV-VIS-NIR)。 The spectral dependent intensity pattern (interference pattern) created at the output of the bloc is recorded with a CCD detector array and the spectrum is calculated by the computer via a Fourier transform algorithm and calibration tables。

 

 

 

 

The diffusing light (over a diameter of 4mm) can directly enter the to pass trough a narrow entrance slit (generally of 25mm for an equivalent resolutiondevice and so it does not need and comparable acceptance angles) as for the conventional commercially available grating spectrometers. This explains the tremendous throughput advantage (between 50 and 100x more!) of the ARCSpectro-HT.
Notice also that fiber and collimation optics are not absolutely necessary,
this may be an advantage for certain applications where cumbersome and lossy optics are not desired.

Throughput Advantage:

 

Multiplex advantage:

A Static Fourier transform spectrometer basically measure an interferogram on a CCD array and calculates its Fourier transform to find the spectrum. Every pixel of the CCD that measure the interferogram contains information of each wavelength of the light being measured. In contrast to a dispersive (or grating spectrometer) where a pixel contains only (and the whole) information of a single wavelength. So for a small band spectrum (laser line) only one or two pixels will contribute to the spectrum in a grating spectrum. In a FTS every pixel of the CCD (interferogram) will contribute to the final spectrum and we will theoretically get a better signal to noise ratio equal to the root mean square of the number of pixels off the CCD that records the interferogram. Notice that this advantage is not valid anymore if broadband spectra without emission or absorption lines are considered。

Precision Advantage:

For similar reasons  mentioned for the multiplex advantage, the FTS is capable to determined the position of a peak (absorption or emission line) with much more precision than a grating spectrometer. Indeed, in the dispersive the precision is limited by the covered spectral divided by the number of pixels. In a FTS information of the emission or absorption line is spread over all the pixels and mathematical Fourier transform methods permits to determine the peak or dip position with much more accuracy.

Some application ex: amples

  • Raman spectroscopy
  • fluorescence detection
  • Diffuse Reflection
  • Dynamic processes analysis
  • Reflectance measurement
  • Colorimetry
  • Gas detection
  • Diffusing sources

 

A FTS does not use a slit (or glass fiber) to limit the individual frequency reaching the sample and detector as a grating spectrometer does. Overall, more energy reaches the sample and hence the detector in an FTS than in a dispersive spectrometer. This means, for a comparable source and integration time, that the signal-to-noise ratio of a spectrum measured on an FTS is higher than the signal-to-noise ratio attained on a grating spectrometer .

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