Patent ID: 7298469

Claim:
A method for detecting specific density, comprising: firing a first laser beam at a front side of a mirror, said first laser beam fired from a cavity; passing an object past a backside of said mirror; measuring mode hopping in said cavity; plotting a second laser beam, said second laser beam being said first laser beam reflected from said mirror, as a function of the changing gravitational force of said object; determining a second derivative from plotting said laser beam as a function of the changing gravitational force of said object; determining a specific density of said object in proportion to said second derivative; mounting said mirror in a flexible fashion so that said mirror moves in response to passing the object past the backside of said mirror; mounting an electro mechanical actuator to said mirror as an amplifier by overlaying a regular signal in the 1 to 10 khz range on the permanent signal created by the gravitational force; and identifying said object based on the specific density of said object.