Monolithic TDI Detector Substrate for Satellite Imaging
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Solution Overview
Problem
Current imaging devices face challenges in adapting to unidirectional and bidirectional push-broom scanning modes due to the incompatibility of Time-Delayed Integration (TDI) detectors, leading to complex detector arrangements and increased weight and size, as well as alignment issues between separate detector substrates.
Innovation Solution
An imaging device design featuring a main unidirectional TDI detector and additional detectors on the same monobloc substrate, with filters of different spectral widths, allowing for simplified focal plane arrangement and reduced bulk, enabling efficient operation in both scanning modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate substrates are used for main detector and additional detectors, then spectral filtering capability is improved, but device complexity and alignment difficulty increase
Solution Approach 1:
The patent merges the main detector and additional detectors onto a single substrate, eliminating the need for separate substrates and complex alignment mechanisms. This integration maintains spectral filtering capability through on-chip filter structures while significantly reducing device complexity and alignment requirements.
Solution Approach 2:
The single substrate serves multiple functions by accommodating both the main detector array and additional detectors with different spectral filtering characteristics. This multi-functional design allows the device to capture images across multiple spectral bands simultaneously without requiring separate substrate assemblies.
2Adaptability or versatility
If multiple separate detector substrates are used, then spectral detection capability is improved, but weight and size increase
Solution Approach 1:
The patent combines multiple detector types and spectral filtering elements onto a single substrate, dramatically reducing the overall weight compared to using multiple separate substrates. This integration maintains full spectral detection capability while minimizing the weight penalty of having multiple detector assemblies.
3Adaptability or versatility
If separate detector substrates are used, then spectral filtering is improved, but manufacturing and alignment difficulty increase
Solution Approach 1:
The patent integrates all detector elements and spectral filtering structures onto a single substrate during manufacturing, eliminating post-manufacturing alignment operations. This approach ensures precise relative positioning of all components without requiring complex alignment procedures, as everything is fabricated in its final position relative to each other.
4Measurement precision
If unidirectional TDI detector is used, then image resolution is improved, but compatibility with bidirectional scanning is lost
Solution Approach 1:
The patent designs the detector system to be universally compatible with both unidirectional and bidirectional scanning modes while maintaining high image resolution. The detector array and readout electronics are configured to accept images moving in either direction, allowing the same hardware to support multiple scanning configurations without sacrificing resolution performance.
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
The solution simplifies detector arrangement, reduces the number of optical components, and ensures precise alignment, resulting in a more compact, cost-effective imaging device capable of high-resolution imaging in various space observation missions.
Implementation Method 1
a first filter (1a, 1b) arranged to spectrally filter the light flux which reaches the first photosensitive elements (11, 21) of the main detector (1), with a first spectral transmission window; and for each additional detector (2a-2d) a second filter (2a, 2b, 2c, 2d) arranged to spectrally filter the luminous flux which reaches the second photosensitive elements (21) of this additional detector (2a-2d), with the first and second spectral transmission windows being different for the same detection assembly
Implementation Method 2
a main detector (1) of the unidirectional type with several parallel lines of first photosensitive elements (11, 21) which are juxtaposed along a direction of rows
Data Source
AI summary
The apparatus has an optical pickup unit (100) adapted to form an image in a focal plane (PF). A parallel main detector detects unidirectional-type lines (L) of photosensitive elements juxtaposed in a direction line (DL). The lines are offset in a column direction (DC). The main detector includes a transfer line (TL) from main direction to unidirectional parallel column direction. Substrates of two detector assemblies (10) are arranged in the focal plane of the columns such that an edge of the main detector is located on edges of sensors oriented on a same side of the focal plane. An independent claim is also included for a method for realizing an imaging apparatus in an on-board of a satellite or an aircraft.