TUNGSTEN SOURCE MODULE
The Tungsten Source Module includes a 20W tungsten halogen lamp in a quartz envelope, a lamp housing, shutter assembly and variable aperture assembly on a base plate and a regulated 12V DC power supply. Halogen compounds in the lamp recycle tungsten deposited on the inside of the envelope back to the lament. This cycling of tungsten prevents the gradual degradation of the lamp output, particularly in the ultraviolet and increases the life of the lamp. The module can be used as a visible and near infrared source (340 nm to 3 μ) or as a building block to construct a variety of spectrophotometric systems. The module has provisions for attaching a Mini-Chrom monochromator and/or an adapter plate. The addition of a Mini-Chrom converts the Tungsten Source Module to a compact and versatile monochromatic light source. A quartz lens in the lamp housing focuses radiation from the tungsten lamp onto the entrance slit of the Mini-Chrom, obviating the need for additional optics and time consuming alignment. With an adapter plate, the module can be easily attached to the Optometrics sample compartment (see page 12). A silicon detector (see pages 14 and 15) can then be added, resulting in a manual spectrophotometer or uorometer. Overall dimensions in mm: 203 x 114 x 62; Weight 0.9 Kg (2.0 lbs).

* See Monochromators page for details on models available.
 

SPECIFICATIONS

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SAMPLE COMPARTMENT
The versatile Optometrics Sample Compartment accepts standard 1 cm square cells or solid samples up to 50 x 50 x 10 mm. A quartz lens focuses incident radiation in the center of the cell or on the front surface of a solid sample depending on the position of the sample stage. Two additional quartz lenses focus transmitted, reflected or emitted radiation at the in-line or 90 degree detector ports. A filter holder, which accepts Optometrics' 25.4 mm diameter filters, is attached to the inside of each port.

When measuring the percent transmittance or absorbance of a solution or a transparent solid sample, the sample stage and detector are positioned in-line. Fluorescence or nephelometric measurements are made with the detector positioned 90 degrees to the incident radiation. Reflectance measurements from solid samples require rotating the sample stage 45 degrees and placing the detector 90 degrees to the incident radiation. Overall dimensions in mm: 218 x 168 x 92; Weight 2.5 Kg (5.4 lbs.)

* See Monochromators page for details on models available.

OPTICAL PATH CONFIGURATIONS

SPECULAR REFLECTANCE SAMPLE COMPARTMENT
The Specular Reflectance Sample compartment is designed to measure the reflectance of solid samples such as mirrors, paint samples, etc. It attaches to the exit port of an Optometrics Mini-Chrom monochromator* with the use of the Adapter Plate. Monochromatic light from the exit slit of the monochromator is reflected onto the sample, which is held in position by a spring-loaded mount. The angle of incidence at the sample is 11 degrees. Light from the sample is reflected to a detector at the exit port. The unit is supplied with a mirror for making a reference measurement.

The standard Sample Compartment, measures samples at a 45 degree angle of incidence, whereas the Specular Reflectance Sample Compartment is designed for measurements requiring a smaller angle of incidence. Maximum sample size is 7 x 14 cm.

* See Monochromators page for details on models available.

OVERALL DIMENSIONS IN MILLIMETERS

	CATALOG NO. SAMPLE COMPARTMENT PRICE ($) 8-0050 Specular Reference Sample Compartment 1,595.00

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LONG PASS CUT-ON FILTERS
Long pass cut-on filters are used to prevent higher order radiation from the grating monochromator from entering the sample compartment. Optometrics' long pass cut-on filters are cored from selected color glasses which transmit radiation above and block radiation below a specified wavelength. The wavelength interval (transition interval) from blocking to maximum transmission is sharp, typically 25 to 35 nm. Long pass cut-on filters are identified by a cut-on wavelength, i.e., the wavelength at 50% of maximum transmission.

Long pass cut-on filters have an average high transmission of 85% from 15 to 20 nm above their cut-on wavelength to 2000 nm. Attenuation of radiation below the cut-on wavelength is due to absorption of the colorants in the glass and the thickness of the glass. Superior blocking in Optometrics' filters (0.001%) is due to the use of 3mm thick color glass.

Optometrics' long pass cut-on filters are all epoxied in a black metal ring for easy mounting and handling and are 25.4 mm dia. x 9.65 mm thick. The cut-on wavelength is marked on all filters. Designed to mount directly in the Optometrics' sample chamber.

GENERAL SPECIFICATIONS

LONG PASS CUT-ON FILTERS

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STEPPING MOTOR CONTROLLER
The PCM-02 is a modular component, ideally suited for driving the Optometrics line of Scanning Digital Monochromators. Using a computer, the operator can move the monochromator to a specific wavelength and scan over a wavelength range. The PCM-02 application program can be used with Windows 95 or 98, 2000, ME, XP and Vista. When a terminal is used to drive the monochromator, the user can access over 25 commands that control a variety of operations of the grating drive (e.g. including the distance to be moved, the initial and nal velocities of the move, the acceleration, the time period for pauses, etc.). Commands can be sent at any time, even when the motor is operating. The motor controller board includes over 2,000 bytes of non volatile memory to store complex motion control programs. Six Scanning Digital Monochromators are available for use with the PCM-02. Each monochromator is fitted with a pair of entrance and exit slits by the user. Additional slits can be ordered separately.

* See Monochromators page for details on models available.

GENERAL SPECIFICATIONS

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DETECTOR MODULES
Optometrics' Silicon Detector Modules are designed for direct mounting on Mini-Chrom monochromators or in either aperture of the standard Sample Compartment.
The modules are compact, low cost, simple to mount and require no user alignment. The silicon detectors have a wide spectral response(200 nm to 1100 nm) with a peak response at approximately 900nm. The detectors cover the UV-VIS-NIR spectral region and are used extensively as components in analytical and biomedical instrumentation, and in research, teaching and quality control. In addition to their wide spectral response, photo cells have excellent linearity and signal-to-noise ratios.

The Detector Module consists of a mounted silicon photodiode, an integral low noise, high speed and exceptionally high stability operational and a slit assembly in a rugged housing. Mounting is facilitated by a pair of banana plugs on the slit assembly. When exposed to electromagnetic radiation of sufficient energy, photo cells generate an electrical signal. The signal is the result of a photon induced difference in potential between the P and N layers within the photo cell, i.e. the photo voltaice ect. The signal is proportional to the energy of the impinging radiation and varies as a function of wavelength. The Silicon Detector Module incorporates a photocell with low dark current, a fast response time, a quartz window and thin P-layer for an enhanced response to ultraviolet radiation. A slides witch enables the selection of the time constant and "fast" for the recording (RS) spectrophotometer and computer data acquisition.

Power to the modules ( ± 15V DC) can be supplied with a wall mounted power supply (for 115VAC) or by an external power supply (for 230VAC).

* See Monochromators page for details on models available.

SPECIFICATIONS

VARIABLE WAVELENGTH FIBER OPTIC MODULE
Configure your own Optometrics' Variable Wavelength Fiber Optic Module - a rugged, low cost compact instrument that produces monochromatic light out of a fiber optic bundle. Operaiton is as simple as turning on the lamp and rotating a dial until the desired wavelength appears on the four digit counter. The module can be used for remote spectroscopic sensing or in any application requiring monochromatic radiation that cannot be obtained easily by conventional methods.

The module is comprised of a 20 watt tungsten halogen source, a digital or scanning digital monochromator and a five foot fiber optic bundle. The fiber bundle end is formed into a rectangular array that plugs directly into the monochromator, functionally replacing the exit slit. It is supplied with a 600 micron slit assembly for use on the entrance side. The other end terminates in a conventional circular bundle. Choose either the Digital Mini-Chrom or the Scanning Digital Mini-Chrom monochromator* and a Stepping Motor Controller.

* See monochromator page for details on models available.

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TUNABLE LIGHT SOURCES

Tunable light sources are used to maximize throughput in the visible region of the spectrum. They are used to study wavelength dependent chemical, biological, and physical changes or properties. The sources can also be used in color analysis and reflectivity measurements of products for aesthetic purposes.

The filament of a 20W tungsten halogen lamp is imaged so that it exactly fills the entrance slit of a Mini-Chrom monochromator. Surprisingly, as higher power lamps have larger filaments, most of the extra energy never makes it through the entrance slit and lamps with significantly higher wattage will not produce significantly higher throughput.

By turning the knob on the manual version, or using software control on the motorized version, the grating is rotated to allow only a few nm of light to pass through the fiber optic adapter or cable. Optometrics offers a wide range of grating choices for its tunable light sources to provide optimum band pass selectivity and throughput. The lamp used in the TLS series has usable spectral energy between 360 nm and 2000 nm. However, no one grating can give adequate performance over this range.

Optometrics offers versions optimized for the visible spectrum 360 nm to 800 nm and others for the near infrared. (see variable wavelength fiber optic modules.)

For most illumination applications, band passes of 5 nm or narrower are considered to be high resolution. Band passes of 10 nm or less are rarely needed in colorimetry or photochemistry.

Optometrics offers three models; the TLS-6 with a 6 nm band pass, the TLS-10 with a 10 nm band pass and the TLS-25 with a 25 nm band pass when used with the standard 600 micron entrance slit and the optional 7-2505 or 7-2506 fiber optic cable. Power increases with band pass. Typically users will trade band pass for throughput, i.e. use the widest band pass possible that will not affect the quality of the measurement.

Typical power output using the 7-2505 fiber bundle and a 600 μ entrance slit. The power and band pass will increase or decrease proportionally to the change in effective entrance and exit port apertures.

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