Commercial spectrophotometers are basically designed to measure the absorbance of solutions contained in transparent cuvettes. Although their functions can be generally extended by means of a variety of accessories, these instruments are generally not flexible and do not fit solid samples thicker than some centimeters. This paper describes a highly versatile spectrophotometer, named Lumen, composed of discrete components and suitably arranged on a large breadboard. Two noticeable instrument configurations are discussed: the first allows to measure the transmittance through long samples, like crystals of lengths up to 23 cm; the second was developed to perform the same measurement in microstructures a few tens of micrometers wide, like those obtained in insulating materials by focused radiation beams. The data acquisition software, written in LabVIEW, adopts some original solutions that make Lumen unique. © 2004 American Institute of Physics.
All Science Journal Classification (ASJC) codes
Montecchi, M., Baccaro, S., Dafinei, I., Diemoz, M., Montereali, R. M., & Somma, F. (2004). Lumen: A highly versatile spectrophotometer for measuring the transmittance throughout very long samples as well as microstructures. Review of Scientific Instruments, 75(11), 4636 - 4640. https://doi.org/10.1063/1.1805005