. The Bell System technical journal . ice. The use of this transducer and line is illustrated in Fig. 16. Pulses in:he TEoi mode are sent into the waveguide by the upper section of thetransducer as shown. Some of the TEoi energy goes directly across toohe TE02 transducer and appears as the outgoing pulse with a leveldown about 32 db. This is useful as a time reference in the system ands shown as the outgoing pulse in the photo of the oscilloscope traceibove. The main energy in the TEoi mode propagates down the line ashown by dashed line 2, which is the path of this wave. Most ofohis energy goe
. The Bell System technical journal . ice. The use of this transducer and line is illustrated in Fig. 16. Pulses in:he TEoi mode are sent into the waveguide by the upper section of thetransducer as shown. Some of the TEoi energy goes directly across toohe TE02 transducer and appears as the outgoing pulse with a leveldown about 32 db. This is useful as a time reference in the system ands shown as the outgoing pulse in the photo of the oscilloscope traceibove. The main energy in the TEoi mode propagates down the line ashown by dashed line 2, which is the path of this wave. Most ofohis energy goes all the way to the reflecting piston at the far end andohen returns to the TE02 transducer where it gives a pulse which isnarked TEoi round trip on the trace photograph above. Two thirds of;he way from the sending end to the piston, the mode filter being meas-ired is inserted in the line. When the TEoi mode energy comes to thisnode filter, a small amount of it is converted to the TE02 mode. This 58 THE BELL SYSTEM TECHNICAL JOURNAL. Fig. 15 — A special experimental transducer for injecting the TEoi mode andreceiving the converted TE02 mode in a 5 diameter waveguide. continues to the piston by path 4 (with dashed Hnes and crosses)and then returns and is received by the TE02 part of the appears on the trace photo as the TE02 first conversion. When themain TEoi energy reflected by the piston comes back to the mode filter,conversion again takes place to TE02 • This is shown by path 3 hav-ing dashed lines and circles. This returns to the TE02 part of the trans-ducer and appears on the trace photo as the TE02 second addition, a small amount of energy in the TE02 mode is generatedby the TEoi upper part of the transducer. It is shown by path 5, having OUTGOING PULSE TEoi ROUND TRIP TE02 SECOND CONVERSION TE02 FIRST CONVERSION TE02 ROUND TRIP
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
