Advanced Split–beam Optical System In a spectrophotometer the optical system is the heart of the instrument. Ensuring that the optical system is built with the best design and highest quality materials will guarantee accurate readings and a long life for the meter. When developing this meter our research and development team payed special attention to details and combined many small improvements to a typical spectrophotometer design to create a portable meter with unprecedented performance. Replaceable Tungsten– Halogen Lamp To be able to measure in a wide variety of wavelengths a broadband light source is necessary. In the iris® visible spectrophotometer, this is accomplished by a tungsten–halogen lamp. As these lamps do not last inde¡nitely, it is necessary to change them throughout the life of the meter. The pre–alignment of the lighting ¡xture guarantees that the bulb is in the same position every time it is changed. This generates peace of mind as there is no need to worry about realigning the light source. Beam Splitter The beam splitter is added to the optical system for use with a reference detector to ensure that the measurement compensates for any drift in the light source. It works by splitting the light emitted by the tungsten lamp into two beams and sending one beam of light to the reference detector that measures intensity. If there are any uctuations in the light source the meter detects this and compensates through a mathematical calculation. The reference detector also saves battery life and leads to improved speed of the meter as the lamp doesn’t have to warm up prior to use. 10 Photometers 10.11 www.hannainst.com | iris® Spectrophotometer
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