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Fiber Optic Spectrometer Specifications

 

The PC2000 PC Plug-in Spectrometer is a low-cost, 2048-element linear CCD-array fiber optic spectrometer mounted on a half-length, 1 MHz ISA-bus A/D card. This sturdy spectrometer-A/D card combination fits easily into a slot in the PC.

The PC2000 is just $1,999, which includes a Master spectrometer channel and ISA-bus A/D card combination. Additional (up to 7 Slave) channels can be added at just $799 each, and are available in an ISA-bus version. (A PCI-bus Slave channel version is still in development). Each Slave channel has its own optics and detector.

The PC2000 uses the same high-sensitivity detector and miniature optical design that distinguishes our S2000 Miniature Fiber Optic Spectrometer. Like the S2000, the PC2000 is responsive from 200-1100 nm and couples via an SMA 905 connector to our extensive line of fiber optic light sources, probes, chemical sensors and other accessories. By mixing and matching the PC2000 and other components, users create convenient, small-footprint spectrophotometric systems for a variety of optical-sensing applications.

In addition, the PC2000's multiple-channel capacity allows users to configure systems for expanded wavelength range, multi-sampling or reference measurements. Installation and operation are straightforward: Small harness cables connect the Master spectrometer channel to each successive Slave channel. These Slave channels operate using the power from the computer and the timing signals from the Master channel.

The PC2000's A/D function includes a channel multiplexer rotator that permits rapid switching between channels. For example, acquisition with a triple-channel spectrometer can be configured so that Pixel #0 is acquired from the Master channel, Pixel #1 from the first Slave channel, and Pixel #2 from the second Slave channel; as the sequence repeats, Pixel #3 is acquired from the Master channel, and so on. The result is that spectra acquired by multiple spectrometer channels during the same integration period can be sampled by the A/D, making the PC2000 especially useful for applications involving pulsed light sources and transient spectral events.

The data acquired using the multi-channel scanning capability of the PC2000 is automatically de-interlaced (i.e., separated into individual spectra for each channel) by Ocean Optics software drivers, so that use of this feature is transparent to the user.

The PC2000 comes with OOIBase operating software for Windows, and is supported by all Ocean Optics software products, including our application programs, code for software development, and interface packages.

 

PC2000 Fiber Optic Spectrometer -- Features & Benefits

How much will my PC2000 spectrometer cost?

The PC2000 is just $1,999, which includes the spectrometer, A/D card interface and operating software. A complete spectrophotometric system -- the PC2000 plus light source and sampling optics -- is available for less than $2,700. That's about 10x less expensive than benchtop laboratory spectrophotometers offered by many manufacturers.

 

What is the optical design of the PC2000 spectrometer?

Ocean Optics took a familiar optical design -- the crossed Czerny-Turner spectrometer -- and reconfigured it for an optical bench small enough to fit into the palm of your hand. The result is a more flexible, lower cost spectrometer with no moving parts and a compact design that's easy to integrate as an OEM component. What's more, the bench is small enough to mount directly onto an ISA-bus A/D card (for Master and Slave spectrometer channels) or PCI-bus A/D card (for Slave spectrometer channels only), providing PC plug-in convenience. Note: The PCI-bus Slave channel option is still in development.

 

What detector is used in the PC2000 spectrometer?

The PC2000 has a Sony ILX511 linear CCD-array silicon detector that's up to 50x more sensitive than the detector in earlier generations of Ocean Optics miniature fiber optic spectrometers. The increased sensitivity results, in part, from the PC2000's smaller well depth and larger individual pixel elements (12.5 mm x 200 mm).

 

What is the spectral response of the PC2000 spectrometer? What is the spectral range available for my application?

The PC2000 has a linear CCD-array silicon detector responsive from 200-1100 nm. Each channel in a PC2000 can be configured with one of 14 gratings options covering various segments of the UV, VIS and Shortwave NIR. The spectral range available with a particular grating depends on its groove density (expressed in lines per millimeter). The most frequently specified gratings are 600 lines/mm, and typically have a spectral range of ~650 nm.

 

What desktop-PC interface options are available for the PC2000 spectrometer?

The Master channel in any PC2000 configuration is limited to ISA-bus architecture. Slave channels, however, can be ordered in either ISA-bus or PCI-bus slot configurations. Slave channels also can be mixed -- for example, a system with three Slaves could be configured with Slave 1 for an ISA-bus slot, and Slaves 2 and 3 for PCI-bus slots. Note: The PCI-bus Slave channel option is still in development.

 

What optical resolution can be achieved with the PC2000 spectrometer?

Optical resolution (Full Width Half Maximum) with the PC2000 depends on the groove density of the grating and the size of the entrance optics -- either the diameter of the fiber or width of the entrance slit. When configured with a 3600 lines/mm grating and 10 mm slit, the PC2000 achieves optical resolution to ~0.3 nm (FWHM). A more likely setup for most applications -- a 600 lines/mm grating with a 50 mm slit -- achieves optical resolution to ~2.1 nm.

 

How does the PC2000 spectrometer couple to sampling optics?

The PC2000 has an SMA 905 connector for easy coupling to our extensive line of SMA-terminated fiber optic accessories, including light sources, probes, spheres, collimating lenses, patch cords and cuvette holders.

 

What software is available for the PC2000 spectrometer?

The PC2000 comes with OOIBase spectrometer operating software for Windows. Other software options (separately priced) include add-on programs for applications such as color measurement, code for Windows 95, Windows 98 and Windows NT software development, and various driver interface packages.

 

PC2000 Fiber Optic Spectrometer -- Specifications

Ocean Optics miniature fiber optic spectrometers offer high performance at low cost, in a convenient, modular package. Operating performance will vary according to a number of factors, including the spectrometer configuration -- especially the groove density of the grating and the size of the sampling optics selected -- as well as the application itself (for example, low vs. high light level applications).

 Detector Specifications

Detector: 2048-element linear silicon CCD array
CCD elements: 2048 elements @ 12.5 mm x 200 mm per element
Well depth (@ 600 nm): 160,000 photons
Sensitivity (estimated):
  • 86 photons/count
  • 2.9 x 10-17 joule/count
  • 2.9 x 10-17 watts/count (for 1-second integration)
Effective range: 200-1100 nm
Integration time: 3 milliseconds to 60 seconds

 

Optics Specifications

Gratings: multiple grating choices, optimized for UV, VIS or Shortwave NIR
Slits: 10, 25, 50, 100, 200 mm widths (slit height is 1000 mm);
alternative option is no slit (optical fiber is entrance aperture)
Order-sorting: single-piece, multi-bandpass detector coating for applications from ~200-850 nm (available only with 600 lines/mm gratings) or glass longpass filters (installed or loose)
Resolution: ~0.3 nm-10.0 nm FWHM (depends on groove density of grating and diameter of fiber or width of slit)
Stray light:
  • < 0.05% at 600 nm
  • < 0.10% at 435 nm
  • < 0.10% at 250 nm
Fiber optic connector: SMA 905 to single-strand optical fiber (0.22 NA)

 

PC2000 A/D Card Specifications

Board architecture/design:
  • Master channel = half-length ISA-bus card for single slot in desktop PC
  • Slave channels = half-length ISA-bus or PCI-bus card for single slot in desktop PC (PCI-bus option is still in development)
A/D resolution: 12-bit
A/D sampling frequency: 1 MHz (maximum)
A/D channels: 8
Multiple-spectrometer capability: up to 8 spectrometer channels (Master + 7 Slaves)
Software compatibility: supports all Ocean Optics software and Windows 3.x, Windows 95, Windows 98, and Windows NT for certain products and drivers
Installation parameters:
  • set dip switch for Base Address (default setting is 768 decimal, 300 hex)
  • set dip switch for IRQ Interrupt Level (default setting is IRQ 7)
Integration time:
  • 3 milliseconds to 60 seconds

 

PC2000 Fiber Optic Spectrometer -- System Interfaces

Optical Interface

The PC2000 connects to any SMA-terminated, single-strand optical fiber. The optical interface can be the fiber (patch cord) itself, or a patch cord coming from another device such as a cuvette holder or probe. Indeed, with Ocean Optics modular components users can create an almost endless variety of optical-sensing systems. Generally, these systems fall into three categories:

Transmission through gas or liquid samples can be measured in a cuvette holder or via an on-line transmission dip probe. Solid slabs, such as optical filters, can be measured in an in-line filter holder. Also, custom transmission assemblies can be configured using Ocean Optics collimating lenses.

Reflection from a flat surface depends on sampling geometry. Standard configurations can be assembled to measure at 90 and 45 /90 or other fixed angles (with collimating lenses or with the 6 fibers-around-1 fiber R200 series reflection probe). Also available is an integrating sphere that provides even surface illumination for reflection measurements.

Emission can be measured using an optical fiber collecting with a 25 Field of View (FOV), or using a collimating lens. Solar radiation or light source emission can be measured using a cosine-corrected irradiance probe collecting with a 180 FOV. Fluorescence and other optical phenomena can be measured using collimating lenses or our CUV-ALL 4-way Cuvette Holder.

 

Electronic/Computer Interface

The PC2000 is the S2000 PC Plug-in spectrometer platform (see Ocean Optics Miniature Fiber Optic Spectrometers for information on other S2000 spectrometer platforms). PC2000 spectrometers interface to desktop PCs via an A/D card onto which an S2000 Fiber Optic Spectrometer optical bench has been mounted. This spectrometer-A/D card combination fits into a slot in the PC. Slave channels can be configured for ISA-bus or PCI-bus slots.

Computer requirements for spectrometer operation are an IBM-compatible PC with 80386 DX or better microprocessor, minimum 4 MB RAM (8 MB recommended) and a math co-processor.

All Ocean Optics software options will operate under Windows 3.x, Windows 95 and Windows 98. Also, a 32-bit driver is available for writing applications for Windows NT.

 

Software Interface

Ocean Optics spectrometers are supported by OOIBase, the Windows-based operating software that comes with the system, as well as a variety of programming-level interface packages and add-on applications available at additional cost.

 

Applications programs

  • OCEAN32 real-time data acquisition, analysis and graphics package
  • OOIColor Microsoft Excel worksheet for color measurement (including L*a*b*)
  • OOILab stand-alone software for color measurements
  • OOIPharm software for time series analysis
  • OOIIrrad application software for absolute spectral irradiance measurements
  • OOIFOXY fiber optic oxygen sensor software
  • OOIRaman operating software for the Raman Systems R-2000
  • pHiber Optical pH Software (POPS) Windows application for monitoring and displaying pH data collected with the Ocean Optics fiber optic pH sensor

 

Code/drivers for software development and application interface packages

  • OOIWinIP Windows Interface Package with 16- and 32-bit DLL, plus example programs written in Microsoft Excel, Visual Basic, Visual C++, Borland C++, and Delphi; includes source code (Visual C++) to OOIBase spectrometer operating software for Windows
  • OOILVD LabVIEW interface packages for configuring Ocean Optics spectrometers as virtual instruments in National Instruments' LabVIEW acquisition, analysis and display program

 

For more information, visit the Ocean Optics web site at: www.oceanoptics.com

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Last modified:  10/28/06
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