intro
The deuterium lamp is the ultraviolet light source of the UV-visible spectrophotometer, and the wavelength range of the light emitted by it is generally 190~400nm continuous spectral band. The wavelength range of deuterium lamps is generally 190~360nm. The deuterium lamp has a characteristic spectral line at 486.0nm, 583.0nm, and 656.1nm, and is often used as the theoretical wavelength value of the calibration instrument (656.1nm and 486.0nm are used most, and 583.0nm is rarely used, because it is not sharp enough and also accompanied by small peaks).
Deuterium lamp is widely used in UV detector of liquid chromatograph, UV-VIS spectrophotometer, electrophoresis instrument,SOx/NOx analyzer, blood examination and other analytical testing instruments.
sort
At present, there are many kinds of deuterium lamps commonly used at home and abroad, which can be roughly divided into two types according to the pins: one is a deuterium lamp with three pins (also known as receptacle type), and the other is a deuterium lamp with three pins. Deuterium lamps with three pins are generally marked with cathode and anode signs for easy identification by users. At present, the deuterium lamps produced abroad, except for a few enterprises, basically belong to the deuterium lamp with three pins. Such as Japan's Hitachi, the United States RCA, the United Kingdom's Cathde, Germany's Helitype and other companies' products. In a three-pin lead deuterium lamp, two pin leads are cathodes (generally black) and one pin leads are anodes (generally red). Most of the deuterium lamps produced in China are deuterium lamps with three-pin lead mode. Such as Changzhou Yuyu electro-optical device factory, Shanghai electro-optical device factory, Yizheng electronic tube factory and other production of deuterium lamps. However, Changzhou Yuyu electro-optical Device Factory has developed a socket type deuterium lamp, and can compete with similar foreign products, some of the main performance technical indicators are better than foreign products. The biggest advantage of the socket type deuterium lamp is that the height of the luminous point is fixed (but cannot be absolutely unchanged, the general error is 0.1-0.2mm), and the height of the luminous hole of the deuterium lamp does not need to be adjusted when replacing the new deuterium lamp. The deuterium lamp with three pin leads, when the new deuterium lamp is replaced, the height of the luminous point in the luminous hole must be adjusted, which is very inconvenient for the user.
Characteristic line
Deuterium lamps are the standard lamps most commonly used to measure the wavelength accuracy of UV-VIS spectrophotometers. Most imported UV-VIS spectrophotometers use a deuterium lamp on the instrument to measure wavelength accuracy. In the domestic UV-visible spectrophotometer, above the mid-range, with automatic scanning instruments, also use the deuterium lamp on the instrument to detect wavelength accuracy (such as TU-1900, TU-1901, UV-2100, TU-1810, SP-2500 and other instruments that can realize automatic wavelength scanning); However, in the domestic "75" series UV-VIS spectrophotometer, many instruments can not automatically scan, such as 751, 752, 753, 754, 755 and other UV-vis spectrophotometers, you can not use the deuterium lamp on the instrument to detect wavelength accuracy.
In particular, two points should be noted: first, instruments with spectral bandwidth greater than 2nm can not use the deuterium lamp on the instrument to detect wavelength accuracy, because 656.1nm this characteristic spectral line is very sharp, easy to produce errors; Second, instrument manufacturers can not only use deuterium lamps to detect wavelength accuracy, because the wavelength accuracy of the visible region is good, and cannot completely replace the wavelength accuracy of the ultraviolet region.
The characteristic wavelengths of deuterium lamps are 486.0nm, 581nm, and 656.1nm
Instrument test conditions: absorbance is 0; Spectral bandwidth: 2nm; Scanning speed: Medium.
