Patent ID: 11879326
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Measurement (Instruments)
Classification: CPC E  G | IPC E  G

Claim 9:
10. A system comprising:
a downhole tubular having a sidewall joining a sensor housing;
a magnetic sensor disposed within the sensor housing, the magnetic sensor comprising:
a first permanent magnet;
a second permanent magnet;
a magnetic field sensor disposed between opposing poles of the first permanent magnet and the second permanent magnet, wherein the first permanent magnet and the second permanent magnet each produce a magnetic field; and
a circuit connected to the magnetic field sensor, the circuit configured to:
count one or more magnetically permeable objects that have passed by the magnetic field sensor to produce a defined count of the one or more magnetically permeable objects,
measure, via the magnetic field sensor, one or more changes in the magnetic field of at least one of the permanent as one or more magnetically permeable objects passes by the magnetic field sensor,
generate, via the magnetic field sensor, a voltage output based on the one or more changes, the voltage output including a positive voltage peak and a negative voltage peak,
determine direction of the one or more magnetically permeable objects based on a sequence of the positive voltage peak and the negative voltage peak,
update the defined count based on the direction of the one or more magnetically permeable objects that have passed the magnetic field sensor, wherein the defined count will be increased with a first sequence of the positive voltage peak and the negative voltage peak, and wherein the defined count will remain unchanged or decremented with a second sequence of the positive voltage peak and the negative voltage peak; and

an electrically triggered device coupled to the magnetic field sensor wherein the circuit is further configured to send a signal to the electrically triggered device based on the updated defined count.