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of one meter, which corresponds to one milligauss (The Earth s magnetic field is about 05 ga) The control/display unit contains an active filter, additional amplification circuitry, a moving-coil ammeter, and an audio oscillator with speaker Figure 20-1 shows the front-panel controls and indicators of the monitor: moving-coil ammeter, SENSITIVITY, RATE, and ALARM ADJUST potentiometers as well as power (OFF), filter-in and RANGE switches
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Figure 20-1 Aurora monitor
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Twenty: Aurora Monitor Project
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could not be contacted during periods of low sunspot activity In addition to scrambling low-frequency radio communications, the magnetic storms caused by auroras can induce large currents in power transmission lines Those currents can cause overload, plunging large regions of the country into darkness Auroras and related magnetic storms are quite common during the decreasing parts of the 11-year sunspot cycle such as the period we are now in The Aurora Monitor consists of two main components, a sensing head and the control/display unit which are connected by a coaxial cable The sensing head contains a sensing coil, a DC nano amplifier capable of current amplification of 500, and a separate power pack, all enclosed in the tubular case shown on the right side of Figure 20-1 Figure 20-2 illustrates the interior of the Aurora Monitor prototype The Aurora Monitor is sensitive to a pulse of one ampere at distance
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The sensor head unit
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The sensor head schematic circuit is illustrated in Figure 20-3 Gain is provided by U1, a National Semiconductor LM4250 programmable operational amplifier It is protected from over voltage and transients by diode D1 and D2, and its overall gain is set by resistors R1 and R2 The output of U1 is driven to zero or balanced by network R3 and R4 Its output should remain at zero as long as no changes occur in the ambient magnetic field Bypass capacitors C2 and C3 are placed across the positive and negative power supply Power for the sensing amplifier is obtained from two C cells The sensor circuit draws very little current, so it can be left on at all times, thus eliminating the power switch
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The control/display unit
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The control/display circuit schematic is depicted in the schematic in Figure 20-4 It provides an additional gain of 200 over that of the sensor circuit The control/display circuit includes an adjustable low-pass notch filter, U2, a Linear Technology LTC 1062 By adjusting the clock frequency of the filter with resistor RI1 and the capacitors C4, C5 and C6, the filter cancels interference frequencies and noise in the 2 Hz to 10 kHz band The notch filter can also screen out 60 Hz noise Switch S2 inserts or removes the filter U3, an LM201A general purpose op-amp, filters out the clock noise generated within the filter chip The output of U3 is fed into the non-inverting input of U4-A, half of a dual 747 general purpose op-amp The overall gain of U4-A is adjusted by resistor R16 Trimmer potentiometer R15
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Figure 20-2 Aurora monitor console and sensor
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Twenty: Aurora Monitor Project
+15 V
C3 R3 L1 Soft iron core 2 7 D1 D2 3 1 5 R4 +15 V 15 V R1 C1 C2 R5 U1 8 4 6 J1 R2
15 V B1
15 V + B2 15 V
Figure 20-3 Aurora monitor sensor head
adjusts the offset or balance PULSE SHAPE potentiometer R17 and capacitor C5 form an optional pulse-shaping network for coupling the Aurora Monitor to a chart recorder or an analog-to-digital conversion board of a personal computer The output of U4-A is coupled to a voltage follower at U4-B The output of U4-B is divided into two channels One channel is fed through 5000-ohm SENSITIVITY potentiometer R18, which adjusts the output level of the signal fed to the 100-microampere panel meter MI Movement of the meter s needle shows changes in the local magnetic field Potentiometer R18 also adjusts the output signal that can be fed to a chart recorder for data-logging The other channel is fed through ALARM ADJUST 5000-ohm potentiometer, R19, which sets the threshold or set-point for the reflex oscillator circuit that follows it The oscillator consists of transistors Q1, Q2, and Q3 and associated components Speaker SPKR1 gives an audible indication of changes in the local magnetic field The network of diode D3 and aluminum electrolytic capacitor C8 performs additional filtering for the input signal to the reflex oscillator section
Transistor Q1 controls the audible alarm by clamping the negative voltage returning through the ground path When a magnetic event occurs, the speaker emits an audible alarm, and the meter gives a visual indication of a changing magnetic field The adjustment of ALARM ADJUST potentiometer R24 can remove distortion from the sound of the speaker The author s prototype control/display unit is powered by eight AA cells: four cells provide positive voltage and four cells provide negative voltage As an alternative, the monitor can be powered by rechargeable nickel-cadmium cells
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