Block analog signal processing

Fig. 3 Analog signal block diagram of multi-mode sensor Fig.3 shows the block diagram of the analog signal treatment of the sensor electronics. Going into the details of the circuit would exceed the objective of this paper. The electronics in the sensor are kept to a minimum. Most of the signal processing is conduaed by the counter.

Figure 10.2h gives a sketch of the feedback control system and a block diagram for the two-heated-tank process with a controller. Let us use an analog electronic system with 4 to 20 mA control signals. The temperature sensor has a range of 100°F, so the Gj transfer function (neglecting any dynamics in the temperature measurement) is... 

Now let s look in detail at each process, so that we can understand the NMR acquisition parameters needed to set up the experiment. After the pulse, we will follow through the hardware devices in a block diagram and try to understand a little about the NMR hardware. It turns out that processing of the NMR signal in the hardware is strictly analogous to the theoretical steps we will use in viewing the NMR experiment with the vector model, so it is essential to understand it in general. 

The very identification of some contaminating agent leads experimenters to explore analogical connections to processes found outside of the laboratory setting. If the experimental environment is known to behave in ways that are sufficiently similar to a known physical system, then experimenters construct certain material to block the interference. The system of forces, entities, and processes is attributed by analogy as the possible source of extraneous signal. 

With the basic building blocks described above, it is possible to perform analog processing that may in some cases substitute successfully for digital computation further along the signal chain. The following example illustrates the potential utility in a force-measurement application. 

Figure 14. Block diagram of the microvoltmeter detection system, consisting of a frequency converter and a programmable amplifier. The processed signal may be monitored using an analog meter or LCD display during the setup and optimization stages of the experimental protocol.

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