Electronic tube maker Burle Industries Inc. of Lancaster, Pa., has purchased Galileo Corp.'s scientific detector and spectroscopy products business. That includes single-channel and microchannel detectors, fiber optic lightguides and remote spectroscopy products. Galileo of Sturbridge, Mass., previously sold manufacturing assets from a discontinued business to IPG Photonics Corp., also of Sturbridge. The transactions leave Galileo with businesses in optical filters and medical instruments for women's health. Josef W. Rokus, Galileo's vice president, did not disclose sale prices, but indicated that the aggregate proceeds -- approximately $8.5 million -- would be used to reduce the company's outstanding debt to below $6 million.