Final report for miniature laser ignited bellows motor

Abstract

A small optical to mechanical link has been developed for uses where low velocity force is required. This device uses a small B/KNO, charge to actuate a miniature rolling bellows. This laser diode ignited system provides approximately 4 Ibs of force over 0.1 inches of displacement. The device was designed to move a small barrier either into or out of the way to provide means for a miniature optical arming feature. The overall size of the device is less than 1/2 inches long and 1/8 inches in diameter. A mounting feature allows simplified integration into new or existing systems. This device has been developed as EBCo part number 235699-1. SCOPE The purpose of this program is to select the pyrotechnic material and develop manufacturing techniques for the laser ignited miniature bellows. The intent of this program is to demonstrate this new technology and to ultimately manufacture deliverable prototypes. As part of this effort, an optical switching technique has been be developed to roughly determine the velocity profile of the bellows when fired in the unrestrained state. SAFETY The items tested contain pyrotechnic materials. These materials are sensitive to heat, friction, impact and electro-static discharge.' Bulk quantities of pyrotechnic, or subassemblies and test articles containing pyrotechnic must be handled with care and in accordance with the standard procedures for handling such materials. Laser diodes and Nd:YAG lasers were used for initiation of the test articles. These devices use firing units charged to high voltage and discharge cohesive collimated light. Proper interlock protection for Nd:YAG laser and safety procedures were used throughout this program. Only Ensign-Bickford personnel trained in the use of laser systems or laser firing units were allowed to handle and use the electronics, lasers, and test units. All testing was accomplished in accordance with EBAC General Safety Procedures (PS 0038/11). ANALYSIS OF DESIGN The challenges of this development program were to balance the gas output to desired force, ignite with a 1 Watt rated laser diode, and to downsize processes to manufacture such a small complex device.