Incredible Optical Resolution From A Spectrometer This Small?
Ocean Optics HR4000 High-resolution Spectrometer Achieves
Sub-angstrom Resolution with a 4-inch Focal Length
Dunedin, Fla., January 2005 – The Ocean
Optics HR4000 High-resolution spectrometer is the smallest high-resolution
spectrometer available -- with a footprint of just 145 mm x 104 mm, it
takes up no more bench real estate than a DVD case. Small, yes -- but this
cleverly designed miniature spectrometer is a powerful combination of
optics and electronics that provides big features including sub-angstrom
optical resolution, fast integration times and unmatched user-controlled
timing and triggering of the spectrometer and accessories.
The HR4000, available for $3,999, has a new
3648-element CCD-array detector from Toshiba and achieves optical
resolution to 0.2 Å (FWHM) with a 4-inch focal length, a feature that is
normally associated with larger 1-meter focal length systems. Its
high-resolution capability makes the HR4000 especially useful for
applications where closely aligned spectral features must be resolved,
such as wavelength characterization of lasers, absorbance of gases, and
determination of elemental atomic emission lines. The HR4000 can be
customized for specific applications with hundreds of modular fiber optic
accessories.
The spectrometer is responsive from
200-1100 nm, although both spectral range and optical resolution will vary
by the user’s selection of a diffraction grating (there are 13 options)
and an entrance slit (available in widths of 5, 10, 25, 50, 100 or 200
microns). Other operating parameters of note are dynamic range of 2.5 x
109 and signal-to-noise of 2500:1 for a single integration period.
The spectrometer’s integrated onboard
module has 10 user-programmable digital I/O lines for interfacing to other
equipment; 13-bit analog input and 9-bit analog output; and a pulse
generator for triggering other devices. Users can use the I/Os to flash a
lamp, stop/start a process, and send a message/alarm during the
spectrometer’s integration period.
Also significant is the HR4000’s very fast
spectrometer integration time of 10 microseconds, which provides two
significant benefits. First, it allows users to measure transient events
like laser pulses. Second, the ability to integrate the spectrometer for a
brief duration eliminates many of the saturation problems that can occur
in applications with very high light energy.
The HR4000’s high-speed electronics have
been designed for considerable flexibility in connecting to various
modules and external interfaces -- including PCs, PLCs and other embedded
controllers -- through USB 2.0 or RS-232 communications. Its USB 2.0
interface enables full spectral scans into memory every 4 milliseconds.
The HR4000 operates via USB interface with
no external power requirements, or via RS-232 interface and a single +5
VDC power supply. Because the HR4000 has an onboard microcontroller,
operating parameters can be controlled through software. In fact,
wavelength calibration coefficients unique to each spectrometer are
programmed into a memory chip right on the spectrometer.
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