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Shanghai Spectral Analysis Instrument Co., Ltd
Suggestions for the selection and use of light sources for UV visible photometers
Date: 2025-09-23Read: 10
UV Vis spectrophotometerBy emitting light of a specific wavelength through a light source, the absorption characteristics of the sample are detected to achieve analysis. The selection and reasonable use of the light source directly affect the performance of the instrument and the reliability of the detection results. 
1、 The selection of light source needs to be adapted to the detection requirements.UV Vis spectrophotometerUsually equipped with two core light sources: deuterium lamp and tungsten lamp. Deuterium lamps are an ideal choice in the ultraviolet region, capable of emitting continuous ultraviolet light with stable luminescence intensity and high spectral purity. They can effectively cover the absorption characteristics of samples in the ultraviolet band and are suitable for detecting substances sensitive to ultraviolet absorption. Tungsten lamps focus on the visible light region, providing a continuous visible spectrum with high luminous efficiency and long lifespan, meeting the detection needs of most samples in the visible light range. Some instruments are designed with a combination of deuterium and tungsten lamps, which achieve continuous coverage of ultraviolet and visible light regions through automatic switching, simplifying the operation process.
2、 The use of light sources requires attention to maintenance and standardized operation. Deuterium lamps and tungsten lamps are both consumable components, and their luminous intensity gradually decreases over time. It is necessary to regularly monitor the stability of the light source and replace it in a timely manner if necessary to ensure the accuracy of the detection signal. Strict sequence should be followed when turning on and off - first turn on the host power, wait for the light source to preheat and stabilize before measuring; When shutting down, first turn off the light source and then cut off the main power supply to avoid sudden power outages that may damage the lifespan of the light source. Avoid frequent switching of light sources in daily use to reduce performance degradation caused by current surges; Keep the optical window and light source surface of the instrument clean to prevent dust or stains from affecting the quality of light output.
3、 The environment and operational details affect the performance of the light source. The instrument should be placed in a stable working environment to avoid interference with the light source caused by vibration or drastic temperature changes; During use, it is necessary to prevent direct sunlight or external light sources from leaking into the detection system and interfering with signal acquisition. For long-term continuous detection tasks, attention should be paid to the working status of the light source. If there are abnormal fluctuations in light intensity or baseline drift, the light source problem should be promptly investigated.
Reasonable selection of light sources and adherence to standardized usage and maintenance procedures can fully leverage their potentialUV Vis spectrophotometerThe detection capability ensures the accuracy of analysis results and the long-term stable operation of the instrument.