Topics - UV Detector

UV Detector UV detectors function on the capacity of many compounds to absorb light in the wavelength range 180 to 350 nm. The sensor cell usually consists of a cylindrical cavity about 1 mm I.D and a few mm long, having a capacity that ranges from about two micro-liters to eight micro-liters. Light from a UV light sources passes through the sensor onto a photoelectric cell, the out put from which is electronically modified and presented on a potentiometric recorder, a computer screen, or printer. By interposing a monochrometer between the light source and the cell, light of a specific wavelength can be selected for detection and, thus, improve the detector selectivity. Alternatively a broad band light source can be used and the light after passing through the cell can be optically dispersed by prism or grating and allowed to fall onto a diode array. By monitoring a specific diode, the detector can be made specific for those substances that absorb at that particular wavelength. If the output from all the diodes is scanned then a UV absorption spectrum can be obtained to aid in solute identification. The fixed wavelength UV detector has a sensitivity of about 1 x 10-8 g per ml at a signal to noise ratio of two