Abstract: A sensor with a dynamic latch comprising having a sensor coupled to a gain amplifier, a delay circuit connected to the gain amplifier and a summing circuit coupled through first and second nodes to the gain amplifier. The sensor with a dynamic latch further comprises an output stage coupled to a comparator circuit and the summing circuit and to third and fourth nodes and first and second energy storing devices coupled to the comparator circuit.

Abstract: A sensor for optically detecting a location of an object within a field of the sensor includes first, second and third photodetectors arranged to receive photons from respective first, second and third sensing zones within the field of the sensor. The first, second and third sensing zones are adjacent to one another and the sensor includes a processing circuit that receives first, second and third signals from the respective first, second and third photodetectors. One of the first, second and third signals is indicative of photons reflected by the object within the field of the sensor and the processing circuit compares the one of the first, second and third signals to another one of the first, second and third signals and a predetermined threshold value to determine the location of the object within the field of the sensor.

Abstract: A magnetometer sensor is described for a borehole survey. The magnetometer features a bobbin made from a metal alloy such as copper-nickel, which has a very low magnetic permeability, on the order of 1.0001, which can be joined to a magnetic metal alloy, such as Permalloy, by welding, which can be treated by annealing at a temperature of 1500 degrees Fahrenheit and which has a thermal coefficient of expansion generally on the order of the magnetic alloy. In one particular embodiment, the magnetometer sensor comprises a strip of magnetic metal alloy wrapped around the aforesaid bobbin to define a magnetic core, one excitation winding wrapped around the core, a plastic frame for carrying the magnetic core and excitation winding and at least one sense winding wrapped around the frame, the core and the excitation winding.