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OPTELECOM 3654AT RGB/XGA VIDEO LASER FIBER OPTIC TRANSMITTER NR!!!! |  |
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OC-12/STM-4 FIBER OPTIC UNCOOLED LASER TRANSMITTER AGERE/LUCENT 1245FBDC | |
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259002-1 AMP Fiber Optic Transmitter 125Mb/s 1300nm | |
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FDE-1300-TXSA PCO Optic Transmitter Vintage FDE1300TXSA | |
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269011-1 AMP Fiber Optic Transmitter 125Mb/s 1300nm | |
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FDH-1300-TXSA PCO Optic Transmitter Vintage Gold | |
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68X7188 68X7189 42F8036 ATT Optic Transmitter Gold | |
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Optical Attenuator, 6.2% Transmitter, 25.4mm diameter | |
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BT&D Optical Transmitter Component ~ Semiconductor Laser ~ XMT1300-1.2-FP Kit | |
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Optic Transmitter
What new procedures can be adopted to ensure the prompt rescue of miners after a mine collapse?
I claim a complete lack of expertise in this area, so don't hold it against me if I come up with some stupid ideas. I just wonder if there is a way to improve how we look for miners after a collapse.
What if miners began to wear powerful radio transmitters during these operations so that their precise location could be determined in three dimensions after a collapse? Perhaps their three-dimensional position could be cyclically broadcast via radio transmission. At the very least, the strength and source direction of a radio signal would hopefully offer information regarding the location of the miners.
Are these mines just too deep underground for such a thing to work? Then, might fiber-optic cables survive a mine collapse? Perhaps a device kept near the miners could keep track of its own location and transmit this information via cable...
If anyone has thoughts or ideas, speak out. There has to be a solution!
A system to track miners locations at all times would help to pinpoint their locations at the time of the collapse. Afterward, a radio transceiver in the same tunnel might be able to communicate. If they can move somewhere else, it must be open enough for signals to propagate.
It does not seem like fiber optic cable would survive a collapse any better than plain old wires.
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OPTELECOM 3654AT RGB/XGA VIDEO LASER FIBER OPTIC TRANSMITTER NR!!!! | |
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US $28.99 | 17d 9h 28m |
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OC-12/STM-4 FIBER OPTIC UNCOOLED LASER TRANSMITTER AGERE/LUCENT 1245FBDC | |
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US $285.00 | 15d 3h 18m |
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259002-1 AMP Fiber Optic Transmitter 125Mb/s 1300nm | |
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US $24.99 | 12d 16h 53m |
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FDE-1300-TXSA PCO Optic Transmitter Vintage FDE1300TXSA | |
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US $14.99 | 12d 9h 58m |
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269011-1 AMP Fiber Optic Transmitter 125Mb/s 1300nm | |
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US $24.99 | 12d 9h 58m |
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FDH-1300-TXSA PCO Optic Transmitter Vintage Gold | |
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US $59.95 | 12d 6h 32m |
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68X7188 68X7189 42F8036 ATT Optic Transmitter Gold | |
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US $69.99 | 2d 3h 15m |
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Optical Attenuator, 6.2% Transmitter, 25.4mm diameter | |
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US $21.00 | 23d 5h 8m |
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BT&D Optical Transmitter Component ~ Semiconductor Laser ~ XMT1300-1.2-FP Kit | |
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US $68.00 | 7d 16h 32m |
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Agilent HP J1422A OPTICAL TRANSMITTER MODULE | |
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US $9,500.00 | 27d 8h 7m |
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Scientific Atlanta PRISMA MODEL 6473 OPTICAL TRANSMITTER | |
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JDS 420B-25ST 420B ULTRA HIGH SPEED LASER TRANSMITTER FIBER OPTIC | |
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NEW HP Agilent HFBR-1002 Optical Transmitter | |
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Tektronix OTS91T2 OC192/STM64 Transmitter Optical Test | |
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Tektronix OTS91L1 Transmitter Receiver Optical Test | |
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US $700.00 | 20d 14h 41m |
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SUMITOMO 2.5Gbps FIBER OPTIC Transmitter Module SDT8008-TC-QN ***NEW*** | |
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SUMITOMO 2.5Gbps FIBER OPTIC Transmitter Module SDT8008-TD-QN ***NEW*** | |
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US $150.00 | 17d 8h 40m |
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Tektronix A6906S Optical Fiber Isolation System A69T06 Transmitter | |
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US $495.00 | 16d 9h 52m |
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AMP Optimate 501446-1 Optical Receiver/Transmitter | |
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US $175.00 | 15d 1h 28m |
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Scientific Atlanta Prisma Model 6473 Optical Transmitter | |
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US $149.00 | 25d 9h 27m |
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4CH Video Data Optical Fiber Media Converter/Converters Transmitter/Receiver | |
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Deal! (16) Optek OPF-1414 Fiber Optic HS Transmitters | |
0 Bid | US $79.95 | 2d 7h 20m |
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Toshiba TOTX147 TRANSMITTER MODULE FIBER OPTIC x 10PCS | |
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US $14.99 | 21d 26m |
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Hitec 54114 NiMH 8-Cell 9.6V 1600mAh Transmitter/Radio Battery Optic/Eclipse | |
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US $32.95 | 12d 14h 29m |
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Toshiba TOTX147L TRANSMITTER MODULE FIBER OPTIC x 2PCS | |
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US $3.99 | 27d 20h 20m |
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Collimator lens FC fiberoptic laser transmitter receiver FSO optic optical | |
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US $450.00 | 3d 23h 45m |
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Hitec 58320 Trainer Cord For Optic 6 / Aurora Radios/Transmitter | |
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US $5.95 | 6d 16h 54m |
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Pelco Fiber Optic Video Transmitter FT8332MSTR 32 Channel 111Gbps | |
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US $495.00 | 4d 6h 26m |
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Sumitomo Fiber Optic Receiver Module SDT8918 Single Transmitter SDT8995-RC-QN | |
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US $15.95 | 4h 54m |
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Transmitter $24.95 Transmitter |
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Optic $29.99 Denise Duplock Optic - Giclee Print |
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Spare Part MadFire LE/RE: transmitter $30 transmitter |
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AT-3101Q BII type 6ch 2.4G transmitter $92.12 transmitter |
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Transmitter 4CH $45.5 Transmitter 4CH |
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HM-037-Z-44 transmitter $60 HM-037-Z-44 transmitter |
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Radio Set Up and Programming with Hitec Optic 6 Part 1
Difference in the shape of an input pulse and output pulse in an optic fibre.?
A power against time graph showing an input pulse and output pulse in an optic fibre,indicates that the output pulse lasts longer but its amplitude is greatly reduced. Why? If optic fibres are such efficient transmitters the change in shape should be minimal.
The transmission down the wire involves many reflections off the outer surfaces of the wire - therefore, some of the light energy takes a longer path through the fiber than other light energy - this separation widens the shape of the output pulse.
Random variations in angle of bounce tends to widen the pulse - some of the light energy makes a more direct path down the fiber - some of the light energy makes a less direct path down the fiber - the further the pulse travels, the wider the spatial difference between the leading edge of the pulse and the tail end of the pulse.
Since the total energy is constant - this must lead to a reduced amplitude - although total energy is more or less constant.
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