Electromagnetic field imaging device
AssigneeNational Institute of Information and Communications Technology
InventorsShinji FUKUI, Muneo YORINAGA, Masahiro TSUCHIYA
Life of this patent
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Abstract
An electromagnetic field imaging device according to one aspect of the present disclosure includes a polarizing optical member arranged to face an imaging subject. A modulated light from a laser light source is influenced by an electric field from the imaging subject in the polarizing optical member. The modulated light subjected to the influence of the electric field is imaged as a detection light. The polarizing optical member is supported in a state of being movable in a direction of a plate thickness of the polarizing optical member. The plate thickness of the polarizing optical member is no larger than 1.2 times a minimum void interval of a wiring of the imaging subject.
Claims8
An electromagnetic field imaging device configured to image an electromagnetic field, which is an electric field or a magnetic field, generated from an imaging subject including at least a wiring, the electromagnetic field imaging device comprising:
- a modulated light outputter configured to be able to output a modulated light that is obtained through modulation at a specific modulation frequency;
- a polarizing optical member which is a plate-shaped member having an electro-optical effect or a magneto-optical effect, arranged so that an opposing surface, which is one of the plate surfaces, faces the imaging subject and the modulated light output from the modulated light outputter enters an incident surface, which is the other one of the plate surfaces, in a perpendicular direction, and configured so that a polarization state and a phase of the modulated light that has entered the member are changed by application of the electromagnetic field when the electromagnetic field exists in the member and a detection light, which is the modulated light after the change, is caused to exit;
- a first supporting member attached to the incident surface of the polarizing optical member to support the polarizing optical member, and through which both the modulated light and the detection light are transmittable;
- a reflection member attached to the opposing surface of the polarizing optical member to reflect the modulated light that has entered the polarizing optical member and propagated to the opposing surface toward the incident surface side;
- a second supporting member configured to support the first supporting member so as to be movable in a direction of a plate thickness of the polarizing optical member;
- a polarized light processor configured to convert the detection light that has exited through the first supporting member from the polarizing optical member to a light modulated according to an intensity and a phase of the electromagnetic field, and output the light;
- a photoelectric convertor arranged to receive the detection light output from the polarized light processor and modulated in the intensity of the electromagnetic field, and configured to photoelectric-convert the received detection light to an electric signal and output the electric signal;
- and
- an image processor configured to generate and display a two-dimensional image indicating a distribution of the electromagnetic field generated from the imaging subject based on the electric signal output from the photoelectric convertor and the modulation frequency,
- wherein the polarizing optical member has a plate thickness of no larger than 1.2 times a minimum void interval of the wiring.
Dependencies are inferred from the claim text.