BOSTON, Jan. 4 -- PerkinElmer Inc. announced the sale of its Detection Systems business to L-3 Communications for approximately $100 million. The sale is expected to close in the first quarter of 2001. In a separate announcement, Hawthorne, Calif.-based OSI Systems Inc., which makes optoelectronic-based components and systems, said it has a letter of intent with L-3 Communications "to purchase certain assets that will be acquired by L-3 from PerkinElmer Inc. as part of its purchase of PerkinElmer's Detection Systems business." 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