Terahertz Imaging Detector Array for Low-Power Covert Communications
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Solution Overview
Problem
Conventional terahertz imaging systems are costly, power-intensive, and limited in utility, making them unsuitable for lightweight, portable, and low-power applications such as detecting concealed objects behind materials like clothing or camouflage.
Innovation Solution
A passive terahertz imaging system utilizing a high-density staring terahertz focal plane detector array with a 2D antenna-coupled micro-bolometer detector, featuring a bow tie antenna design and a bolometer configuration that achieves low noise-equivalent power and wide-reception bandwidth, allowing for high angular resolution and low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional terahertz imaging systems are used, then imaging capability is achieved, but cost and power consumption increase significantly
Solution Approach 1:
The detector array is divided into multiple independent detectors, each with its own horn receiver and bolometer. This segmentation allows for modular construction and reduces the power consumption of the overall system while maintaining imaging capability.
Solution Approach 2:
The system uses uncooled micro-bolometer detectors instead of conventional cooled detectors, changing the operating temperature parameter from cryogenic to ambient temperature. This dramatically reduces power consumption and eliminates the need for complex cooling systems.
2Measurement precision
If conventional terahertz imaging systems are used, then imaging capability is achieved, but device weight and complexity increase
Solution Approach 1:
The patent extracts and eliminates the complex cooling systems and cryogenic infrastructure from conventional terahertz imaging systems. By using uncooled micro-bolometer detectors, the system removes heavy thermal management components, reducing both weight and complexity.
Solution Approach 2:
The system uses inexpensive, commercially available uncooled micro-bolometer detectors instead of expensive, complex cooled detectors. This approach trades some sensitivity for dramatically reduced cost and complexity, making the system suitable for portable applications.
3Measurement precision
If detector sensitivity is improved, then detection precision increases, but device complexity and cost increase
Solution Approach 1:
The patent combines the horn receiver and micro-bolometer detector into an integrated detector assembly. This merging of components simplifies the overall detector design while maintaining sensitivity, as the horn antenna efficiently couples terahertz radiation to the micro-bolometer element.
Solution Approach 2:
The micro-bolometer detector serves multiple functions: it detects terahertz radiation, converts it to electrical signals, and operates at ambient temperature. This multi-functionality reduces the need for additional specialized components, thereby reducing overall system complexity.
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 enables the detection of small temperature changes with high resolution, revealing objects hidden behind various materials while being affordable, lightweight, and low-power, suitable for diverse applications including covert communications.
Implementation Method 1
Each detector includes a horn receiver configured to capture the radiation using an antenna positioned in or proximate to a throat of the horn receiver
Implementation Method 2
Each detector also includes a bolometer electrically isolated from the antenna load and in thermal contact with the antenna load
Implementation Method 3
a bolometer electrically isolated from the antenna load and in thermal contact with the antenna load
Data Source
AI summary
An apparatus includes a link receiver having a detector array configured to receive radiation from a remote communication device, where the detector array includes multiple detectors. Each detector includes a horn receiver configured to capture the radiation using an antenna positioned in or proximate to a throat of the horn receiver, where the antenna is coupled to an antenna load. Each detector also includes a bolometer electrically isolated from the antenna load and in thermal contact with the antenna load. The link receiver could include a terahertz camera. The detector array can be located at a focal plane of an optical system configured to receive the radiation through a specified far-field solid angle. The apparatus could also include a link transmitter configured to generate and transmit second radiation to the remote communication device and/or a communication transmitter/receiver configured to communicate with the remote communication device.