The MIDL
wavelength calibration lamp provides the following information
- Wavelength accuracy
- Actual spectral resolution
- Contrast (peak to valley ratio)
- The alignment of the optics in the system
- Evidence of scattered or stray light
- Compare relative instrument performance
To Order: Click here
For over 50 years almost every research grade spectral
instrument used in physics, chemistry, analytical spectroscopy,
astronomy or the remote Earth sensing community use an ion
discharge lamp to calibrate their spectrometers.
The most common is a low pressure Hg+/Ar+ lamp that emits
light from 254 nm up to about 920 nm. The emission
lines are very narrow so that the actual spectral resolution of an instrument
can be determined by observing the full width at half maximum
(FWHM) of the various emission lines.
The wavelengths of Hg and Ar lines are known to many decimal
places and can be found on the NIST website. In other
words a Hg/Ar lamp is an ABSOLUTE not
a relative calibration source. A low pressure Hg/Ar lamp
emit bright lines at 254, 365, 405, 436, 546, 577/579, 695,
811 and 911 nm. (Actually there are many more; but these
are the most widely used.)
To Order: Click here
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