Fig. 1 Spectral irradiance of calibrated lampsNIST traceable calibrated Quartz Tungsten Halogen (QTH) lamps
QTH models available in 45W, 200W and 1000W
Sources include everything you need to start running the lamp
Highly regulated Oriel power supplies provide superior performance
Uncalibrated lamps allow you to create your own secondary standards
Recalibration services available
These NIST traceable calibrated lamps are reliable sources of known spectral irradiance in the UV and VIS-NIR. Use these systems to calibrate your own irradiance source, or to transfer our NIST traceable calibration to a spectroscopic detection system. We offer quartz tungsten halogen irradiance standards as individual lamps and as complete sources, which include a Radiometric Power Supply, lamp mount and lamp (with calibration data).
Each of our calibrated lamps is thoroughly tested to specification. Lamps are preconditioned and selected as necessary. The irradiance measurements are taken in our specially outfitted calibration laboratory. In the U.S., the National Institute of Standards and Technology (NIST) provides original uncertainties for their standard lamps. This range varies according to wavelength and lamp structure. There is an additional, small, uncertainty introduced during our procedure. Table 1 shows both (NIST and Newport’s) uncertainty values for the 1000 W QTH lamp.
| Wavelength (nm) | Approximate NIST Uncertainty (%) | Approximate Newport\'s Uncertainty* (%) |
|---|---|---|
| 250 | 1.74 | 2.8 |
| 350 | 1.27 | 2.1 |
| 654.6 | 0.69 | 1.7 |
| 900 | 0.57 | 1.7 |
| 1600 | 0.47 | 2.0 |
| 2000 | 0.50 | 2.0 |
| 2400 | 1.11 | 2.0 |
Lamps have a limited life. If you use the lamp frequently, we recommend that you purchase one or more non-calibrated lamps to produce your own working standard(s).
We offer three types of calibrated irradiance sources:
250 - 2400 nm or 300 - 2400 nm (lamp dependent) calibration range
Offered in 45 W, 200 W and 1000 W powers
Choose a lamp that provides irradiance levels close to what you would like to measure in your wavelength range of interest. Using a lamp that produces too much or too little irradiance puts higher demands on the linearity of your detection system.
Fig. 1 Spectral irradiance of calibrated lamps
These coiled filament lamps are chosen for consistent irradiance over a long period and for low directionality in output. The polarization of the output is no more than 3%. The 200 and 1000 W lamps produce calibrated output from 250 to 2500 nm; the 45 W model produces calibrated output from 280 to 2500 nm. After a burn-in period, we measure the irradiance in open air using working standards derived from a set of NIST calibrated lamps.
Spectral irradiance data in mW m-2 nm-1 units is provided at 10 nm intervals from 250 to 2500 nm spectral range for the 200 and 1000 W models, and 280 to 2500 nm for the 45 W model. NIST spectral irradiance standards are certified at fewer points than Newport’s Oriel Calibrated Lamps. The additional points we provide are based upon interpolation of the NIST data following a procedure published by NIST. Calibration data is supplied on a thumb drive.
Each lamp also comes with a Report of Calibration. In addition to a listing of irradiance values, this report includes the lamp distance, lamp orientation, and laboratory temperature, as well as prescribed safety measures and directions for proper use.
The irradiance information provided with calibrated QTH lamps is measured at a particular lamp current. It is very important, in order to maintain calibration, that these lamps be run by a highly regulated, constant current power supply. Our Digital Radiometric Power Supplies meet exceedingly demanding specifications. In addition to the superior performance, the 69900 Series Supplies have an RS 232 PC interface so you have full access to all the control and monitoring features of the supply from your PC.
Our Calibrated Lamps are run in open-air. The mounts holding the lamps are simple, rod-mounted holders. They have a 1/4-20 tapped hole in the base for an optical rod. The appropriate lamp mount for your lamp is included with each source - or you can purchase individually.
Please contact a Newport Sales Engineer for a quote on recalibrating your lamp. Typically, recalibration is suggested after one year or 50 hours of use.
When there is no clear selection of lamp, based upon irradiance level, the working environment may make the determination. The proper way to operate these lamps for calibration is in our open-air mounts. Therefore, the lower power calibrated QTH lamps are significantly easier to work with. These lamps are as safe as any bright domestic bulb except for the emission of ultraviolet. The 1 kW lamp is uncomfortably bright and heats any absorbing surface close to it; no flammable material should be placed near the lamp. In all cases, UV goggles should be worn and exposure to the skin should be minimized.