摘要:
An electromagnetic field detector adapted to display potential hazard to humans and other animals arising from illuminating electromagnetic energy over the frequency range determined to be hazardous by the American National Standards Institute; the detector being designed with various sensing means to create a sensitivity vs. frequency response that is the inverse of the A.N.S.I. protection guides.
摘要:
A bridge circuit for use with high gain high impedance direct-current amplifiers, when the input circuitry includes components subject to pyroelectric effects. The bridge includes temperature responsive elements connected to an adjustable direct-current voltage supply and produces a control voltage that compensates for changes in the zero offset of the input, due to such pyroelectric voltages.
摘要:
A wide power range radiation monitor includes a pair of diodes with their cathodes interconnected and with an additional capacitor coupled in parallel to one of the diodes. The detector, of the radiation monitor provides two outputs, a low power output and a high power output, which outputs are connected to the anodes of the detector diodes. The arrangement of dual diodes and capacitance provide the diode detector of the monitor with a greater than 40 dB square law region.
摘要:
A wide power range radiation monitor includes a pair of diodes with their cathodes interconnected and with an additional capacitor coupled in parallel to one of the diodes. The detector of the radiation monitor provides two outputs, a low power output and a high power output, which outputs are connected to the anodes of the detector diodes. The arrangement of dual diodes and capacitance provide the diode detector of the monitor with a greater than 40 dB square law region.
摘要:
The present invention relates to a dipole antenna for monitoring electromagnetic radiation fields over an extended frequency range with essentially flat characteristics. The dipole antenna includes two arms, each of which is divided into two or more conducting elements. In one arm, a relatively low resistance is connected in series between the segments, and in the other arm, a relatively large resistance is connected in series between the segments.
摘要:
An antenna comprising orthogonal arrays of resistive thermocouple dipoles interconnected by transversely extending conductive elements of discrete length. The components are designed to create an additional response by a traveling wave effect on the dipoles along the Poynting vector to offset the fall-off in dipole sensitivity experienced as frequency rises.
摘要:
This portable microwave radiation monitor utilizes an antenna formed in a dual Archimedean spiral. The power density of the electric field is indicated on a meter coupled to diode means connected across the inner terminals of the antenna by inductance means selected to resonate with the variable capacitance of the diode, substantially at the frequency of the field being monitored.
摘要:
A temperature probe that does not perturb incident electromagnetic fields which includes a high resistance thermocouple mounted within a rigid needle structure. Special leads connect the thermocouple to appropriate metering means to register the temperature sensed by the thermocouple.
摘要:
The electromagnetic radiation monitor includes a low frequency surface charge sensor, a high frequency sensor, and a lossy material sandwiched between the two sensors. The surface charge sensor responds to electromagnetic radiation from about 100 KHz to about 1 GHz. The high frequency sensor responds to frequencies from about 300 MHz to about 100 GHz. An output signal from the low frequency sensor is detected, and provided to an adjustable gain amplifier. An output signal from the high frequency sensor is similarly provided to a second adjustable gain amplifier. Output signals from the two amplifiers are summed by a summing circuit, whose output signal is provided to one input of a comparator circuit. The output signal from the comparator circuit triggers an audible or visible alarm from the alarm circuit when electromagnetic radiation detected by either or both of the low and high frequency sensors causes the output signal of the summer circuit to exceed a threshold.