Communications: electrical – Continuously variable indicating – Plural transmitters
Patent
1982-12-15
1987-06-23
Caldwell, Sr., John W.
Communications: electrical
Continuously variable indicating
Plural transmitters
34087011, G08C 1904, G08C 1508
Patent
active
046756744
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement for the distribution and/or extraction of signals, as stated in the introductory part of the following claims.
The field of application will mainly comprise interrogation and conversion of a large amount of sensor information in time division multiplex on a common line as well as transmission of information to points on the same line. It is possible by suitable combinations in the form of connection and tapping of the line signal paths to build a multidimensional structure of self generating combinatorial circuits.
In the art various kinds of time multiplex are known. German Specification No. 1 240 446 discloses such a device comprising several sequencially connected mono-stable multivibrators, the first one triggering the next etc. Resistive or capacitive sensors are among the components controlling the time during which the multivibrator is in a working state after a received trigger signal. After the multivibrator has fallen back into a resting position the subsequent multivibrator is triggered, etc.
The previously known systems involving use of multivibrators have the disadvantage that they are a load on the common signal and power supply line, every second transistor in the multivibrators always being conductive as well as the associated components of the circuit. With an increasing load on the line there will, thus, follow a reduction of the possibility of detection and transmission in the form of short current pulses generated on a common line. A considerable weakness is that erroneous triggering is easily released by transients on the line or through the sensors, which may give rise to completely uncontrolled firing of the separate multivibrators. A considerable disadvantage is, thus, that the sequence and the number of monostable multivibrators are not forcibly actuated from a point on the chain, preventing this form from being an integral part of a selfgenerating combinatorial circuit.
It is, thus, an object of the present invention to overcome said disadvantages, and the characterizing features of the invention will appear from the following claims as well as from the following description with reference to the drawing.
FIG. 1 is a schematic illustration of the arrangement according to the invention.
FIG. 2 is a block diagram of the arrangement according to FIG. 1.
FIG. 3a shows examples of switching elements, and FIGS. 3b, and 3c show combinations of switching elements as well as delay circuits.
FIG. 4 is a block diagram of a non limiting embodiment of a delay line provided with several branches and illustrates combinations of the typical inputs and outputs.
FIG. 5 illustrates an embodiment of delay lines used for measuring temperature gradients or mechanical tensions in a construction member, e.g. a beam or a plate.
FIG. 6 illustrates a delay line used as a level indicator.
FIG. 7 illustrates a similar arrangement for recording temperature/temperature gradients in a medium.
FIG. 8 is a diagram showing the current through the switching element as a function of the control signal on said switching element.
FIG. 9 is a typical illustration of the pulse sequence in connection with the various elements of a delay line.
FIG. 10 shows a delay line substantially as shown in FIG. 1, but with passive elements illustrated.
FIG. 11 shows a variant of a delay line having feedback.
FIGS. 12a-d illustrate some current sensing arrangements.
Similar reference numerals are used throughout the drawings to identify similar components.
In FIG. 1 switching elements 1 and delay circuits 2 are shown in a cascade connection. The common circuit is formed by wires 8 and 8' and a current source 10. In principle the cascade connections form a delay line with the characteristic inputs and outputs of different kinds. As shown in FIG. 1, these are mainly to be considered as static or dynamic. A control input 3 is provided for activation of the delay line at a change from a voltage level V.sub.o to V.sub.1, or vice versa. In this manner it is determined which of the switches are
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Caldwell Sr. John W.
Queen Tyrone
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