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Light Source
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.
Specifications |
| 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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Lamp
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.
Lamp Wattage |
Lamp Type |
Nominal Arc Length |
Nominal Arc Width |
| 75 watt |
Compact Arc Xenon |
0.8 mm |
0.3 mm |
| 100 watt |
Mercury |
0.25 mm |
0.25 mm |
Power Supply
 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.
Specifications |
| 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 Vvoltage
|
> 85 volts |
Ripple at Max Current
|
< 10 milli-volts |
Stability After Warm-up
|
0.2% |
Line Vvoltage 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
 Ignition noise can disrupt, or even destroy, sensitive equipment in the vicinity of an Arc Lamp during start-up. This can be quite a concern in a crowded lab environment. OBB Engineers introduced an igniter that is integrated onto the lamp housing. This design provides an effective EMI shield which contains the EMI pulse, providing a safer and more convenient environment in which to do your research.
Igniter Dimensions |
| Length |
3.96 inches, 100.58 mm |
| Width |
3.96 inches, 100.58 mm |
| Height |
1.55 inches, 39.51 mm |
Monochromator
 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. That is to say, you can elect to populate (optional) a second entrance port for a second light source, or you can have a second entrance port (optional) with a light guide to a second microscope.
Specifications 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 |
| 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 |
+/-1 nm (using manual wavelength control) |
| Accuracy |
+/- 0.25 nm (using motorizing option under computer control) |
| Reproducibility |
+/-0.25 nm |
| Optical path height |
76 mm |
| Grating size |
50 x 50 mm |
Monochromator Dimensions |
| Length |
241 mm long (9.5 inches) |
| Width |
272 mm wide (10.7 inches) |
| Height |
115 mm high (4.5 inches) |
| Weight |
7.3 kg (16 lbs) |
Digital Slit Assembly Dimensions |
| Length |
10 mm thick |
| Width |
85 mm wide |
| Height |
180 mm high of which 113 mm is above the lid of the monochromator |
| Weight |
7.3 kg (16 lbs) |
Grating(s)
You must select one or two gratings depending on the Monochromator that you plan to order. The spectral range that you require will determine the type of grating that you should choose.
Standard Gratings Click part # to view spectrum |
| 200 |
600 g/mm, 1,250 nm blaze |
| 201 |
1,200 g/mm 300 nm blaze |
| 202 |
1,200 g/mm 400 nm blaze |
| 203 |
1,200 g/mm, 500 nm blaze |
| 204 |
Holographic grating 300–800 nm |
Special Gratings Click part # to view spectrum |
| 205 |
75 g/mm 10.0 µm blaze |
| 206 |
150 g/mm, 4.0 µm blaze |
| 207 |
300 g/mm, 2.0 µm blaze |
| 209 |
600 g/mm, 750 nm blaze |
| 211 |
600 g/mm 1.0 µm blaze |
| 212 |
1,200 g/mm, 600 nm blaze |
| 213 |
1,200 line/mm, 750 nm blaze |
Liquid light guide
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. The transmission is greater than 30% from 280 nm to 700 nm.
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