Abstract: A system of having a circuit having an electrical coil configured to generate a magnetic field based on properties of a surrounding space and an object presented to the electrical coil and a sensor configured to sense inductance and resistance of the electrical coil and to discriminate the object presented to the electrical coil in accordance with the sensing. A precision variable resistor to control resistance of an in-loop photoresistor with an out-loop photoresistor that are located parallel to each other.

Abstract: A system of having a circuit having an electrical coil configured to generate a magnetic field based on properties of a surrounding space and an object presented to the electrical coil and a sensor configured to sense inductance and resistance of the electrical coil and to discriminate the object presented to the electrical coil in accordance with the sensing. A precision variable resistor to control resistance of an in-loop photoresistor with an out-loop photoresistor that are located parallel to each other.

Abstract: An electromagnetic imager device can detect electromagnetic images, for example, in the infrared, millimeter and microwave wavelengths and convert these images into useful wavelengths which imaging devices, such as a camera, can record. The electromagnetic imager includes an interferometer having one arm thereof filled with a gaseous mixture. The particular gaseous mixture used, improves the accuracy of the device by enhancing the probability of an exchange of kinetic energy for molecular internal energy during molecular collision. The electromagnetic image is absorbed in an internal mode of the molecular species in the gas over an absorption depth. The absorption of the electromagnetic energy causes heating in the gas which, in turn, causes local changes in the index of refraction in the focal plane of the gas. These changes in the index of refraction phase modulate the phase front of the laser beam passing through the gas.