Personal electrostatic safety monitor with induction plate sensing means

Claim 1

A personal safety monitor for detecting the presence of an electrostatic field and for detecting the rate of transfer of said field from one object to another field, comprising, an insulating housing and within said housing, an induction plate means, a positive charge transistor, a negative charge transistor, a first capacitor coupling said induction plate means with said positive charge transistor, a second capacitor coupling said induction plate means with said negative charge transistor, a current amplifier comprising a transistor coupled in Darlington fashion to said positive and negative charge transistors, a voltage amplifier coupled to said current amplifier, a feed-back amplifier coupled to said voltage amplifier, said feed-back amplifier also being coupled to the input of said current amplifier, a driver stage coupled to said voltage amplifier, and in indicator circuit coupled to said driver stage and comprising a signal means which is energized upon said induction plate means being exposed to an electrostatic field above a predetermined threshold hazard value, the degree of capacitive coupling of said first and second capacitors to said induction plate means and the size and position of said induction plate means with respect to the remainder of said circuit, being such that the circuit is activated only above said predetermined threshold hazard value.