B-Field Measurer

Posted on Feb 4, 2013

This circuit develops an output voltage that is proportional to the magnetic induction, B, flowing through its probe`s coi

B-Field Measurer
Click here to download the full size of the above Circuit.

l. You must size the coil to give a full-scale, 10-V output for your maximum expected magnetic-induction intensity. For a given value of (in tesla) and output voltage, Vout; where A is the effective area of your coil in m2 (A=number of turns average area of each turn), R is the resistance of the coil and the probe, and C is the value of the capacitor. Notice that C should be a low-leakage polypropylene or Teflon device. For most practical applications that measure a magnetic field in the air, the coil will be either tiny or very thin. If R = 1 KOhmhm, C= 1 ¥, and the coil is 100 turns with a mean area per turn of 1 cm2, then the circuit"s output will be 1 mV/gauss (1 T= 104G). To use the circuit, push the reset button and place the probe in an area that you know is devoid of magnetic fields. Be sure to avoid magnets and iron. Then, put the probe into the field to be measured and read the Vqut with a voltmeter. Finally, calculate the field"s intensity using the equation. When constructing the instrument, guard the op amp"s inputs from undesirable currents at the minus input. For full-scale outputs, use a +15-V supply for the op amp.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Battery Low Voltage Beeper
    Two-tones Siren with IC 4093
    Power pack for battery-powered devices
    Xilinx ISE Schematics Sequential Circuit
    12V Car Battery Charger circuit
    pid controller Building a temperature-controlled water bath
    Make this Astable Multivibrator Blinker Circuit Using NAND Gates
    555 tracking transmitter
    Schematic Diagram Wiper Speed Control Circuits
    High Quality Intercom circuit
    Linear-Circuits in U.H.F. Oscillators