| 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 depositing onto a substrate ( 12 ) a timing strip ( 14 ) having a starting point ( 14 d) and a discharge point ( 14 e) 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 ( 166 a, 166 b), completing the timing strip with a bridging strip ( 14 c), 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.
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