Flexible Tape Spatial Light Modulator for Millimeter Wave Imaging
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Solution Overview
Problem
Existing spatial light modulators for millimeter wave imaging are inefficient due to the need for multiple rigid masks or a single large mask, which are slow and costly, and do not effectively change blocking patterns quickly enough to achieve high-resolution imaging.
Innovation Solution
A system using a flexible tape with blocking patterns supported by a tape transport mechanism, allowing for rapid linear movement of the tape through an exposure region with nonlinear paths, enabling quick changes in blocking patterns and efficient imaging with a single pixel sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple rigid physical masks are used to generate blocking patterns, then the blocking patterns can be precisely defined, but the imaging speed becomes slow due to sequential mask manipulation
Solution Approach 1:
The single large mask is segmented into multiple smaller masks arranged in a circular array. Each smaller mask contains a portion of the complete blocking pattern, allowing rapid sequential activation of different mask segments to generate the full pattern set without manual manipulation of large masks.
Solution Approach 2:
The system transitions from static rigid masks to a dynamic configuration where multiple mask segments can be rapidly activated and deactivated. The circular array arrangement with rotational capability enables dynamic reconfiguration of blocking patterns at high speed, eliminating the slow sequential manipulation of traditional rigid masks.
2Ease of operation
If a single large physical mask is used to contain all blocking patterns, then mask replacement is eliminated, but the lateral translation speed becomes slow due to the mask's large size
Solution Approach 1:
The single large mask is divided into multiple smaller mask segments arranged in a circular array. Each segment is compact in size, allowing rapid lateral translation and positioning. The segmentation enables the system to achieve fast mask switching speeds while maintaining the capability to generate complete blocking patterns through coordinated activation of multiple segments.
Solution Approach 2:
The mask arrangement transitions from a single-plane large mask to a circular array configuration in two dimensions. This spatial reorganization allows smaller mask segments to be positioned around a central rotation axis, enabling rapid access and translation of individual segments without requiring movement of a single large mask across the entire pattern area.
3Productivity
If a single physical mask is translated by a small amount to generate successive patterns, then translation time is reduced, but the change between blocking patterns is insufficient which reduces image quality
Solution Approach 1:
The blocking pattern is segmented across multiple masks in the circular array, with each mask containing a distinct portion of the complete pattern. This segmentation allows each individual mask to be translated by a small amount while still achieving significant overall pattern change through the coordinated activation of different segmented portions, thereby maintaining both fast switching speed and sufficient pattern variation for high-quality imaging.
Data Source
AI summary
A system passively images a scene using an antenna for collecting electromagnetic energy from the scene and directing the electromagnetic energy toward a single pixel sensor. A spatial light modulator includes a flexible tape that supports a series of blocking patterns along its length. The tape moves through the electromagnetic energy in an exposure region as the energy travels from the antenna to the sensor and the tape moves on a transport path that is nonlinear outside of the exposure region. A processor captures a set of output values from the sensor to form an image of the scene based on the set of output values. Two blocking pattern structures, either rigid or flexible, can be superimposed in an exposure region between an antenna and a sensor.