Abstract: To provide an ion balance sensor and a static elimination system capable of grasping further information regarding an environment of a target space in addition to ion balance in the target space. The ion balance sensor includes a detection plate that is conductive and arranged in a target space. In the ion balance sensor, ion balance in the target space is detected based on a potential of the detection plate. An ion balance signal indicating a detection result is generated. Further, a physical quantity related to an environment of the target space is detected in addition to the ion balance. Another signal indicating information regarding the environment of the target space is generated based on a detection result. The ion balance signal and the other signal are output.

Abstract: A light-projecting unit irradiates a scale with non-parallel light. The non-parallel light having passed through a plurality of slits on the scale is received by a light-receiving unit, and a light reception signal indicating a light-receiving amount distribution is outputted. Based on the light reception signal, a plurality of positions where a light-receiving amount is at maximum or minimum in the light-receiving amount distribution on the light-receiving unit are detected as a plurality of peak positions. Based on correction information and the detected plurality of peak positions, a distance between a reference position and a position of at least one slit corresponding to at least one detected peak position is calculated. The correction information shows a relation of a distance between a plurality of peak positions and a distance between a plurality of slits on the scale which respectively correspond to the plurality of peak positions.

Abstract: A light-projecting unit irradiates a scale with non-parallel light. The non-parallel light having passed through a plurality of slits on the scale is received by a light-receiving unit, and a light reception signal indicating a light-receiving amount distribution is outputted. Based on the light reception signal, a plurality of positions where a light-receiving amount is at maximum or minimum in the light-receiving amount distribution on the light-receiving unit are detected as a plurality of peak positions. Based on correction information and the detected plurality of peak positions, a distance between a reference position and a position of at least one slit corresponding to at least one detected peak position is calculated. The correction information shows a relation of a distance between a plurality of peak positions and a distance between a plurality of slits on the scale which respectively correspond to the plurality of peak positions.

Abstract: The flowmeter is provided with an oscillation circuit receiving supply of electric power in a non-insulated manner from an external power source and supplying the electric power to the coil to drive the magnetic substance, an insulating unit for insulating the coil from the magnetic substance and/or the electrically conductive fluid pipe, and a shielding unit being short-circuited to have a stable electric potential relative to the external power source and shielding the coil against the magnetic substance and the fluid pipe.

Abstract: The flowmeter is provided with an oscillation circuit receiving supply of electric power in a non-insulated manner from an external power source and supplying the electric power to the coil to drive the magnetic substance, an insulating unit for insulating the coil from the magnetic substance and/or the electrically conductive fluid pipe, and a shielding unit being short-circuited to have a stable electric potential relative to the external power source and shielding the coil against the magnetic substance and the fluid pipe.