Changes between Version 12 and Version 13 of Sensors/LeicaLIDAR/FWMikesNotes
- Timestamp:
- Apr 10, 2013, 7:20:47 PM (11 years ago)
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Sensors/LeicaLIDAR/FWMikesNotes
v12 v13 20 20 The full waveform digitiser (FWD) is supplied as an upgrade to the existing ALS50v2 (and up) sensors, and essentially consists of an upgraded data logger and an intensity digitiser (the FWD). The discrete point recording subsystem is unchanged. In implementation, the FWD is added as a spur after the automatic gain controller (AGC). There is a trigger from the discrete system to the FWD that tells the FWD when to start recording. 21 21 {{{ 22 +---> Full waveform digitiser-->--+23 | ^|24 Laser receiver -> Automatic Gain Controller -->| ||--> Data logger25 | ||26 +--- > Discrete point subsystem -->--+22 +---> (fixed gain booster) ---> Full waveform digitiser -->--+ 23 | ^ | 24 Laser receiver -> Automatic Gain Controller -->| | |--> Data logger 25 | | | 26 +-----------------------> Discrete point subsystem -->------+ 27 27 }}} 28 28 … … 52 52 * the .LWV files cannot be easily linked to the .SCN (discrete files) - there is no direct linkage between LWV file 2 and SCN file 2 53 53 54 55 56 57 where did gain come from in waveform viewer 54 Where did gain come from in waveform viewer? 58 55 - volts= digitized value * gain + offset 59 56 - not agc gain, this is a fixed amplication on the waveform board … … 62 59 - system digitises from 0 to 4.something volts 63 60 - gives you volts as received at the waveform board, after AGC applied, etc - probably only useful for engineering team 64 61 * More information on gains and corrections to remove the AGC effect is at [wiki:Sensors/LeicaLIDAR/FWMikesNotes/FWGainDiscussion] 65 62 66 63 ops changes: various.. relevantish ones to us are