A deuterium lamp is an arc lamp filled with deuterium under low pressure, widely used in various analytical instruments, primarily emitting ultraviolet light in the 190–400 nm wavelength range, with certain models reaching as low as 160 nm. It operates through plasma discharge, where the deuterium lamp functions in a stable deuterium (D2 or heavy hydrogen) arc state.
1. Main Features
Wavelength Range: The light emitted by a deuterium lamp generally covers a wavelength range of 190–400 nm, with some models reaching as low as 160 nm, making it an ideal light source for ultraviolet spectroscopy.
High Intensity Output: Deuterium lamps produce a high-intensity UV output with minimal visible light (VIS) and infrared (IR) emissions.
High Uniformity: Some deuterium lamp designs feature high irradiance or uniformity to meet various experimental needs.
Ozone-Free Type: Ozone-free models use UV glass that blocks wavelengths below 180 nm, reducing environmental pollution.
2. Application Fields
Deuterium lamps are widely used in various analytical instruments, including but not limited to:
UV Detectors in Liquid Chromatography: For detecting ultraviolet absorption of compounds.
UV-Visible Spectrophotometers: Used for qualitative and quantitative analysis of substances.
Electrophoresis Instruments: Provide UV light sources for observation during electrophoresis.
SOx/NOx Analyzers: Detect sulfur dioxide and nitrogen oxides concentrations in environmental monitoring.
Blood Analysis: Applied in the medical field for analyzing blood components.
3. Types and Structure
Deuterium lamps come in several types and can be roughly divided into two types based on the pin configuration:
Socket-Type Deuterium Lamps: Feature three pins with a fixed light emission point height, eliminating the need for adjustment during replacement.
Three-Pin Lead-Type Deuterium Lamps: Feature three leads—two for the cathode (typically black) and one for the anode (typically red). When replacing, the light emission point height in the light port may need adjustment.
4. Maintenance and Replacement
The normal lifespan of a deuterium lamp is typically 1,000 to 2,000 hours, depending on usage conditions and brand. When the lamp’s output diminishes or fails to light, it may need replacing. Pay attention to the following when replacing:
Replace the deuterium lamp after it has been turned off and cooled to avoid damaging the filament structure.
Do not touch the deuterium lamp with bare hands, as oils on the skin can leave stains on the quartz jacket, affecting light emission.
If the lamp is accidentally touched, clean it thoroughly with isopropanol or another cleaning agent before installation.
5. Precautions
When working near a deuterium lamp, wear UV protection equipment such as goggles, protective clothing, and gloves to shield your eyes and skin from ultraviolet radiation.
Regularly check the optical system and power lines to ensure the deuterium lamp operates normally.
As an important ultraviolet light source, deuterium lamps play a crucial role in many fields. Proper use and maintenance are essential to ensuring the accuracy of experimental results and the long-term stability of the instruments.
Post time: Sep-13-2024