Ocean Optics Flame-S, User Manual

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5: How the Flame Spectrometer Works
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pixels. Each pixel responds to the wavelength of light that strikes it. The detector
outputs an analog signal from each pixel that is converted via the ADC into a digital
signal. The driver electronics process this signal and send the spectrum via the USB
connection to the software. The best choice of detector will depend on the application.
Detector Specifications
Specification S Type (FLAME-S) T Type (FLAME-T)
Detector Sony ILX511B linear
silicon CCD array Toshiba TCD1304AP linear
silicon CCD array
Strengths

Strong response <
350nm, good for UV
measurements.

Fast data output rate.

Larger pixel size
improves sensitivity

Slightly higher SNR due
to well depth

Larger number of pixels
can offer better resolution
with small slits.

Electronic shutter
Watch for N/A
– Offers strong all-
around performance

Signal lag at low
integration times

Signal may bleed to
neighboring pixels at high
intensities (blooming)

Higher minimum
integration time
See Chapter 6: Technical Specifications for more detailed detector specifications.
9. OFLV Variable Longpass Order-sorting Filter (optional): Our proprietary filters
precisely block second- and third-order light from reaching specific detector elements.
Light reflected off the grating can propagate 2
nd
and 3
rd
order effects at whole multiples
of the incident light. While these signals are weak, they may cause stray light that
reduces the accuracy of the spectrometer response. Order sorting filters reject this stray
light only allowing the desired wavelength through to the detector. Order sorting filters
are combined with detector window upgrades. The full range available is listed below.
These must be specified at the time of ordering.
Detector Window Upgrades (optional): The standard BK7 glass window on the
detector begins to absorb light around 340nm. For applications in the UV, below 360nm,
we recommend the detector window upgrade. This replaces the BK-7 glass with Quartz.
Typically these are used in conjunction with an order sorting filter to block the impact of
2
nd
and 3
rd
order effects at higher wavelengths.