DELAY UNITS AND METHODS OF MAKING THE SAME

摘要

A delay unit (10) comprises a timing strip (14) and, optionally, a calibration
strip (20) deposited on a substrate (12). The timing and calibration strips
comprise energetic materials which optionally may comprise particles of
nanosize materials, e.g., a fuel and an oxidizer, optionally applied as
separate layers. A method of making the delay units comprises deposit? ing
onto a substrate (12) a timing strip (14) having a starting point (14d) and a
discharge point (14e) and depositing onto the same or another substrate a
calibration strip (20). Timing strip (14) and calibration strip (20) are of
identical composition and are otherwise configured, e.g., thickness of the
strips, to have identical burn rates. The calibration strip (20) is ignited
and its burn rate is ascertained. The timing strip (14) is adjusted by an
adjustment structure to attain a desired delay period, preferably on the basis
that the burn rate of the timing strip (14) is substantially identical to that
of the calibration strip (20) and ascertaining the burn rate of the
calibration strip. The adjustment may be attained by one or more of providing
the timing strip with jump gaps (164), an accelerant or retardant (166a,
166b), completing the timing strip with a bridging strip (14c), or
establishing a selected effective length of the timing strip by positioning
one or both of a pick-up charge (16) and relay charge (18) over a portion of
the timing strip.