Electromagnetic Wave Imaging Apparatus Slanted Pulse Plane
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Solution Overview
Problem
Current terahertz wave imaging methods require scanning to obtain information perpendicular to the lineal region, which is inefficient and limits the ability to capture in-plane information simultaneously.
Innovation Solution
An electromagnetic wave imaging apparatus using an electrooptical crystal with a first optical system for pulsed detecting waves and a second optical system that slants the probe wave's pulse plane relative to the detecting wave's pulse plane, incorporating a compensating optical component to partition the beam cross-section into unit areas, compensating phase shifts and allowing simultaneous measurement across multiple positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a noncoaxial optical system is used to detect electromagnetic waves, then the detecting waves can be condensed in a lineal region, but scanning is required to obtain information perpendicular to the lineal region, reducing imaging efficiency
Solution Approach 1:
The beam cross section is partitioned into multiple unit areas using optical components (such as cylindrical lenses or beam splitting elements). Each unit area corresponds to a specific detection position perpendicular to the lineal region, allowing simultaneous acquisition of information from multiple positions without scanning.
Solution Approach 2:
The invention transitions from one-dimensional lineal detection to two-dimensional spatial detection by introducing a dimension perpendicular to the lineal region. This is achieved by creating multiple detection channels that simultaneously capture information across different positions, eliminating the need for mechanical scanning.
2Measurement precision
If the pulse plane of the probe wave is slanted relative to the pulse plane of the detecting wave, then phase shifting can be compensated, but the optical path length difference becomes complex to manage
Solution Approach 1:
An optical path length compensating component is introduced as an intermediary element between the probe wave and detecting wave paths. This component (such as a variable optical delay line or compensating plate) adjusts the optical path length of one beam to match the other, compensating for phase shifts without requiring complex slanting arrangements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient simultaneous imaging across multiple positions perpendicular to the lineal region, enhancing the resolution and bandwidth of terahertz waveforms and spectra by compensating phase shifts, thus improving the imaging efficiency and accuracy.
Implementation Method 1
an electrooptical (EO) crystal
Implementation Method 2
the optical component making different an optical path length of a beam passing each unit area and compensating a phase shifting between the pulse plane of the detecting electromagnetic wave and the pulse plane of the probe wave
Data Source
AI summary
A first optical system irradiates a target with a detecting wave and making the detecting wave that is transmitted through the target incident upon the electrooptical crystal. A second optical system slants a pulse plane of a probe wave relative to a pulse plane of the detecting wave and making the probe wave incident upon the electrooptical crystal. A camera detects the probe wave passing through the electrooptical crystal. The first or second optical system includes a compensating component which partitions a beam cross section of the detecting wave or the probe wave into unit areas. The optical component makes different an optical path length of a beam passing each unit area and compensates a phase shifting between the pulse plane of the detecting wave and the pulse plane of the probe wave at positions in a crossing direction of a surface of the electrooptical crystal and the virtual plane.