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OBB Corp is proud to present a computer controlled tunable high-intensity illuminator comprised of powerful point source arc lamp, power supply and integrated igniter, motorized high throughput quarter-meter type Czerny-Turner monochromator, and USB computer interface and Labview type software. All you need to do is select a grating and lamp.
For the size and cost, it offers an unbeatable amount of optical power, tunable over a wide wavelength range – from 180 nm to 2,500 nm, with variable bandwidth continuously adjustable from 0.25 nm.
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When a broadband light source in the ultraviolet-visible-near infrared portion of the spectrum is required, as for illuminating a monochromator, an arc lamp has no peer. The intensity of an arc lamp is extremely high and, depending on the lamp, reasonably continuous throughout the region from 240 to 1200 nanometers. Usable intensities are available in the deep UV to 180 nm and in the near infrared to 2500 nm.
The essential ingredient that makes OBB Corp’s tunable source the most powerful is the unique light source.
At the heart of virtually every OBB Light Source is a proprietary on-axis ellipsoidal reflector. Our reflectors collect up to 70 % of the radiant energy from the arc lamp – vs 12 % for typical condenser systems. The ellipse literally wraps around the arc lamp, collecting 5 to 6 times more output power than from a conventional system.
The arc source is located at one focus of the ellipse, and the radiation is reflected by the ellipse to the other focus. Since the light is brought to a focus by reflection rather than refraction (through a lens), there are no losses from absorption or lens-surface back-reflection. Since it collects light more efficiently, and focuses it more effectively, an OBB Light Source produces up to 11 times more power to illuminate the narrow slit of a monochromator – typically 1 mm - than other light sources.
Our elliptical reflectors are proprietary in design and the coating used. They are NOT cheap electro-formed reflectors, which can distort with heat, and can degrade within months. Our proprietary design ensures that distortion of the critical ellipsoid does not occur as the lamp reaches its operating temperature. This ensures thermal stability of the focus guaranteeing that the light is delivered through the monochromator slit. The coating ensures reasonably long operating life – typically 2-3 years.
While conventional lamp housings resemble chimneys emitting ozone and requiring cumbersome venting, the OBB compact high intensity light source has a sealed lamp housing that requires no ozone venting.
The lamp housing can accommodate both xenon and mercury lamps, just choose the lamp(s) that best meet your need.
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Lamp power capacity: 75 to 150 watts
Height: 100 mm (3.9 inches)
Width: 100 mm (3.9 inches)
Length: 210 mm (8.3 inches)
Weight: 1.9 kg (4.2 pounds)
Window diameter (D): 65 mm |
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You have a choice of lamps depending on the spectral output that you require. Of course you may order more than one of the lamps, they are interchangeable.
There are two types of arc lamps available – xenon and mercury. The xenon gas used in the lamp provides continuous spectra from 180 nm to 2,500 nm of course at varying intensity (refer to spectral output graph). The mercury provides a line spectra (refer to spectral graph). The spectral curves for xenon and mercury are normalized (relative intensities) therefore it is not obvious that the mercury lamps, intensity – where it emits, exceeds that of the xenon lamp. Because of the smaller arc size, the mercury lamp can also provide greater intensity in a smaller area (greater brightness) than the xenon lamp.
The normal envelope for most lamps is quartz – which generally cuts off the deep UV below 240 nm, but it also eliminates ozone. In case of our lamp housing, because it is sealed, ozone is not a safety hazard. Therefore in case where you require spectral output from 180 to 240 nm (for xenon lamps only), you can order a lamp with a suprasil envelope.
The standard system comes with an adaptor for 75 W xenon and 100 W mercury lamps (the adaptor is the same for both). If you desire to operate a 150 W xenon lamp you will need to get either an extra adaptor (if you plan to operate it in addition to the lower wattage lamps) or a substitute, 150W lamp adaptor in place of a 75 W one.
Although a 150 W xenon lamp has twice the power rating, it does not always mean that you will get twice the usable power. Because of the compact arc size of the 75 W xenon and 100 W mercury lamp they are much better point source (smaller arc size) and will provide much more power into a small area – like for example when you want to illuminate a narrow slit on a monochromator, or illuminate a small fiber optic element or liquid light guide.
If you want to illuminate small areas, typically 1 mm and below, the smaller wattage lamps provide you with more power in that area, than a 150 W lamp would. Obviously if you are interested in illuminating an area above 2 mm, the 150 W lamp will give you more power than a 75 W lamp.
If you want to collimate the output from the lamp, use the smaller lamps because they are point sources will give you better collimation.
The 150 W lamp, because of the sealed housing used will require water-cooling and there is provision on the lamp housing for water cooling. You can either get your water directly from the cold-water tap (can be a problem if the water is hard or when water is not available) or from an inexpensive circulating water bath option that we provide.
We have selected water-cooling over air: because it allows us to make a more compact housing; seal in the ozone and eliminates the need for venting.
Due to bulb geometry, the 150 W lamp will not work with f/1 or f/ 2.5 reflector.
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 The lamp power supply is a highly regulated DC unit that provides very stable power for xenon and mercury compact arc lamps. Designed for use with OBB Corp’s lamp housings, they may be used with lamp housings from other manufacturers for Xenon or Mercury Lamps.
Input (user selectable): 105-120 V/60 Hz or 210-240 V/50 Hz
Power rating: 0 to 150 watts
Operating voltage: 10 to 24 volts
Operating current: 0 to 8 amps
Pre-Ignition voltage: > 85 volts
Ripple at maximum current: < 10 milli-volts
Stability after warm-up: 0.2 %
Line voltage regulation: 0.1 % current variation for 5 volts line change
Load regulation: 0.1 % current variation for 50 % change in load impedance
Dimensions: 4.5 X 10.75 X 12.5 inches, 11.5 X 27.3 X 31.8 cm
Weight: 12 pounds, 5.45 kg
Igniter Dimensions: 3.96 X 3.96 X 1.55 inches, 100.58 X 100.58 X 39.51 mm
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OBB's quarter-meter class, Czerny-Turner type monochromators are extremely rugged and versatile, and are available in single and dual-grating versions. They feature optional computerized wavelength control and an optional internal computer controlled shutter is available.
The monochromator accepts a 50 X 50 mm ruled or holographic grating. It comes in a single or double grating option. In the double grating option the gratings are selectable by means of a turret on top of the monochromator.
The monochromator has four ports that can be utilized for two inputs and two outputs. In the standard configuration it comes with one entrance and exit port populates. This gives you a choice of four different input/output geometries:
180° Straight Line – with folding mirrors on entrance and exit
90° Right Angle – with folding mirror on the exit side
90° Left Angle – with folding mirror on the entrance side
360° – with no folding mirrors
You can also elect as an option to have two entrance ports, two exit ports or two entrance and two exit ports by adding flipping mirror(s) and slit(s), refer to accessories.
Using standard 1200 line/mm ruled grating
Focal length: 200 mm
Aperture ratio: f/4 (calculated using grating width)
Wavelength range: 180 nm to 24 microns (grating dependent)
Bandpass: continuously adjustable from 0 to 25 nm (for 1,200 l/mm grating)
Reciprocal linear dispersion: 4 nm/mm
Resolution: 0.25 nm
Throughput: 60 % at 300 nm
Scattered light: 0.02 % two bandwidths from 365 nm Hg line
Accuracy: +/- 0.25 nm
Reproducibility: +/- 0.25 nm
Optical path height: 76 mm
Grating size: 50 mm X 50 mm
Monochromator
272 mm wide (10.7 inches)
241 mm long (9.5 inches)
115 mm high (4.5 inches)
Weight: 7.3 kg (16 lbs) |
Digital Slit assembly
85 mm wide
180 mm high of which 113 mm is above the lid of the monochromator
10 mm thick |
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You will need to select either one or two gratings for your monochromator – depending if it is single or double grating type. The grating determines the wavelength range and the ultimate throughput efficiency of your monochromator. For ease of selecting the gratings we have included
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Click part # to view spectrum |
| 600 g/mm, 1,250 nm blaze |
| 1,200 g/mm 300 nm blaze |
| 1,200 g/mm 400 nm blaze |
| 1,200 g/mm, 500 nm blaze |
| Holographic grating 300 - 800 nm |
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Click part # to view spectrum |
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75 g/mm 10.0 µm blaze |
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150 g/mm, 4.0 µm blaze |
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300 g/mm, 2.0 µm blaze |
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600 g/mm, 650 nm blaze |
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600 g/mm 1.0 µm blaze |
| 1,200 g/mm, 600 nm blaze |
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1,200 line/mm, 750 nm blaze |
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A software package is provided to control the monochromator and shutter (optional) with an RS-232 electronic interface that will work with PC type computers. Requires Windows 2000 or Windows XP operating system. A DLL is available to integrate to third party software by the user.
- Universal power supply included
- Synchronization TTL output each time motor stops
- Two phase motor 1 A per phase, 200 steps per revolution, 1.8 degree per step
- Maximum motor speed is 1200 RPM with zero torque
- Maximum speed with mono 15,000 nm per minute
- Stepping motor voltage 5-12 V
- Stepping modes: Full, Half and Micro steps: 1/8, 1/16, 1/32, 1/64 computer selectable
- Slew rate: 1 to 62,500 micro steps per second
- Auto calibration of wavelength
- Linear ramping rate for heavy duty, fast, precision operation
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Ideal as a delivery system. We offer a two-millimeter core diameter, two-meter length liquid light guide complete with attachment to exit port of monochromator. Transmission is greater than 30 % from 280 nm to 700 nm.
A computer controlled shutter can be ordered at the time of original order. It requires the Motorized Computer Controlled Wavelength Drive. This is an ideal accessory when working with photodegradable samples.
If you plan to use the monochromator with UV, below 250 nm, you may wish to purge the monochromator with nitrogen gas to eliminate oxygen, which absorbs in the UV.
A second entrance to attach for example a second light source or a second exit can be added to the monochromator. It includes a flipping mirror for selecting desired exit or entrance as well as a slit assembly. If you desire both two exits and two entrances for the monochromator you need two of these accessories.
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