Dual-mode Terahertz Imaging with Horn Receiver and Bolometer Array
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Solution Overview
Problem
Conventional terahertz imaging systems are bulky, power-intensive, and costly, with limited utility due to their scanning nature and lack of high-gain low-noise amplifiers above 100 GHz frequencies, making them unsuitable for portable and efficient imaging applications.
Innovation Solution
A dual-mode terahertz imaging system utilizing a horn receiver with a bow tie antenna and a bolometer array, where the bolometers are thermally isolated but electrically coupled to the antenna load, enabling high-density, low-power, and portable imaging with improved sensitivity and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If scanning heterodyne receiver channels are used for imaging, then imaging capability is achieved, but the system becomes bulky and power-intensive
Solution Approach 1:
The patent replaces the mechanical scanning system with a stationary bolometer array that simultaneously captures multiple frequency channels. Instead of mechanically moving or scanning components, the invention uses fixed antenna-coupled bolometers to achieve imaging, eliminating the bulk and power requirements of scanning mechanisms while maintaining imaging capability.
Solution Approach 2:
The patent divides the imaging system into multiple independent antenna-bolometer units arranged in an array, where each unit detects a specific frequency channel. This segmentation allows parallel detection across multiple channels without requiring a single complex scanning mechanism, reducing overall system bulk and power consumption.
2Measurement precision
If low noise amplifiers are used in the W band, then sensitivity is improved, but the system complexity increases
Solution Approach 1:
The patent replaces complex low noise amplifier circuits with passive bolometer detectors that directly measure thermal power. This substitution eliminates the need for complex amplification circuits while maintaining detection sensitivity, as bolometers provide direct thermal measurements without requiring high-gain amplification stages.
3Use of energy by stationary object
If bolometers are used for passive imaging, then portability is improved, but detection sensitivity decreases
Solution Approach 1:
The patent merges antenna elements with bolometer detectors into integrated antenna-coupled bolometer units. This combination allows the bolometers to efficiently capture terahertz radiation through the antenna structures, significantly enhancing detection sensitivity while maintaining the low power consumption and portability advantages of bolometer technology.
Solution Approach 2:
The patent employs composite structures combining conductive materials for antennas with thermally sensitive bolometer materials. This composite approach optimizes both the radiation capture efficiency and thermal detection sensitivity, enabling portable systems to achieve high detection performance through material optimization rather than increased power consumption.
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 system achieves high angular resolution and low noise-equivalent power, allowing for the detection of concealed objects with minimal power consumption and cost, while being versatile across various frequency bands and applications.
Implementation Method 1
a horn receiver configured to collect radiation and to capture the radiation using an antenna positioned in or proximate to a throat of the horn receiver
Implementation Method 2
a bolometer mounted on a first substrate, where the bolometer is electrically isolated from the antenna load and in thermal contact with the antenna load
Implementation Method 3
capture the radiation using an antenna positioned in or proximate to a throat of the horn receiver
Data Source
AI summary
This disclosure describes antenna elements, terahertz detector arrays formed by antenna elements, and dual-mode terahertz imaging systems that operate using terahertz detector array(s). The antenna element includes a horn receiver configured to collect radiation and capture the radiation using an antenna positioned in or proximate to a throat of the horn receiver. The antenna element also includes antenna posts electrically coupled to the antenna and extending through irises in a conducting ground plane and conductive traces electrically coupling the antenna posts to an antenna load. In addition, the antenna element includes a bolometer mounted on a first substrate, where the bolometer is electrically isolated from the antenna load and in thermal contact with the antenna load. The antenna could include a bow tie antenna having first and second arms on a first surface of a second substrate, where the ground plane is on a second surface of the second substrate.