US 11,402,525 B2 · Earthquake detector

Abstract

Earthquake detector is a solid-state device that detects the motion of a building or structure and initiates an alarm when the motion of a building or structure rises above a certain base level or threshold level of motion that is automatically calibrated or manually entered for the specific building or structure and the specific location of the building or structure. Earthquake detector measures the amplitude of movement and the magnitude of acceleration of the actual building or structure caused by a seismic event, earthquake, or other external force because this is the primary cause of damage to the building or structure and the associated potential for collapse of the building or structure. Earthquake detector has a circuit board; a microprocessor, integrated circuit, or chip; an accelerometer integrated circuit or chip; an alarm module; a connection to a power source; and a calibration control.

An earthquake detector comprising:

a circuit board;
a microprocessor, integrated circuit, or chip;
an accelerometer integrated circuit or chip;
an alarm module;
a connection to a power source;
and a calibration control, wherein,
said circuit board is a printed circuit board,
said microprocessor, integrated circuit, or chip is an integrated circuit or a microchip loaded with a special and custom operating software,
said microprocessor, integrated circuit, or chip is attached to or connected to said circuit board,
said accelerometer integrated circuit or chip is an accelerometer or device that measures acceleration and produces output readings of the measured acceleration and is attached to or connected to said circuit board,
said alarm module is an audible alarm that emits sound waves and/or a visual alarm that emits light that is attached to or connected to said circuit board,
said connection to power source is an electrical connection to a power source that provides electrical continuity between said circuit board and said power source,
said special and custom operating software continuously monitors said accelerometer integrated circuit or chip and continuously obtains an acceleration reading in an x-dimension Ax from said accelerometer integrated circuit or chip at a sample rate of Δt=2-50 milliseconds and performs the following process,
a) said special and custom operating software obtains an acceleration reading from said accelerometer integrated circuit or chip in said x-dimension at time=t−2 and stores said acceleration reading as Ax(t−2),
b) said special and custom operating software obtains an acceleration reading from said accelerometer integrated circuit or chip in said x-dimension at time=t−1 and stores said acceleration reading as Ax(t−1),
c) said special and custom operating software calculates a time derivative of acceleration in said x-dimension for time=(t−2) to (t−1) with the equation A′x(t−1)=(Ax(t−1)−Ax(t−2)/((t−1)−(t−2)) and stores said time derivative of acceleration in said x-dimension for time=(t−2) to (t−1) as A′x(t−1),
d) said special and custom operating software calculates ax(t) estimated with the equation ax(t) estimated=Ax(t−1)+A′x(t−1)*(Δt) and stores said ax(t) estimated as ax(t) estimated,
e) said special and custom operating software obtains an acceleration reading from said accelerometer integrated circuit or chip in said x−dimension at time=t and stores said acceleration reading as Ax(t),
f) said special and custom operating software compares Ax(t) to ax(t) estimated, if Ax(t) is greater than 105 percent of ax(t) estimated then said special and custom operating software sets Ax(t) equal to ax(t) estimated and sets a variable called Estimate Used=Yes, else said special and custom operating software leaves Ax(t) as is and sets a variable called Estimate Used=No,
g) said special and custom operating software calculates velocity in said x-dimension for time=(t−2) to (t−1) during each iteration with the equation Vx(t−1)=(Ax(t−2)+Ax(t−1))/2)*(Δt),
h) said special and custom operating software calculates velocity in said x-dimension for time=(t−1) to (t) during each iteration with the equation Vx(t)=Ax(t−1)+Ax(t))/2)*(Δt),
i) said special and custom operating software calculates displacement in said x-dimension for time=(t−1) to (t) during each iteration with the equation Dx(t)=(Vx(t−1)+Vx(t))/2)*(Δt)],
j) said special and custom operating software compares Ax(t), Vx(t), and Dx(t) to an Ax(alarm), a Vx(alarm), or a Dx(alarm) respectively,
k) if Ax(t)>Ax(alarm) and Estimate Used=No, then an earthquake is detected and said special and custom operating software causes said alarm module to emit sound waves and/or emit light,
l) if Vx(t)>Vx(alarm) and Estimate Used=No, then an earthquake is detected and said special and custom operating software causes said alarm module to emit sound waves and/or emit light,
m) if Dx(t)>Dx(alarm) and Estimate Used=No, then an earthquake is detected and said special and custom operating software causes said alarm module to emit sound waves and/or emit light,
n) if Ax(t)>Ax(alarm) and Estimate Used=Yes, then said special and custom operating software obtains an acceleration reading from said accelerometer integrated circuit or chip in said x-dimension at time=t+1 and repeats said steps a through q,
o) if Vx(t)>Vx(alarm) and Estimate Used=Yes, then said special and custom operating software obtains an acceleration reading from said accelerometer integrated circuit or chip in said x-dimension at time=t+1 and repeats said steps a through q,
p) if Dx(t)>Dx(alarm) and Estimate Used=Yes, then said special and custom operating software obtains an acceleration reading from said accelerometer integrated circuit or chip in said x-dimension at time=t+1 and repeats said steps a through q, and
q) if Ax(t)<=Ax(alarm), Vx(t)<=Vx(alarm), and Dx(t)<=Dx(alarm), then said special and custom operating software obtains an acceleration reading from said accelerometer integrated circuit or chip in said x-dimension at time=t+1 and repeats said steps a through q.

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Earthquake detector

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Earthquake detector

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Abstract

Claims6