| 摘要 |
A fuse device capable of producing a signal in proximity to a target in response to changes in infra-red radiation due to the presence of the target, the device having a single field of view, a device responsive to radiation in said field of view to produce corresponding electrical signals, optical means interposed between said device and said field of view and operable to discriminate against radiation outside a selected range of wavelengths and electronic means supplied with said electrical signals and having a frequency band-pass selected to reject signals having a frequency below a selected value corresponding to a selected minimum rise-time of the signals. |
