Millimeter Wave Detector Using Diode and Shielded Processor
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Solution Overview
Problem
There is a concern about the health risks associated with exposure to low levels of electromagnetic radiation from devices such as millimeter wave scanners, and existing technologies lack a convenient and cost-effective method to determine if these devices are emitting radiation within safe levels.
Innovation Solution
A portable, hand-held electromagnetic radiation detector apparatus that uses a receiving antenna and diode detector to capture millimeter wave signals, coupled with an electronic signal processor for amplification and envelope detection, and a microprocessor for graphical and numerical display of energy density, allowing for the assessment of electromagnetic emissions against safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electromagnetic radiation detection methods are used, then detection capability is limited to high levels of radiation, but the ability to detect low-level pulses is insufficient
Solution Approach 1:
The detection system is divided into specialized functional modules: a receiving antenna for millimeter wave frequencies, a diode detector for signal conversion, multiple cascaded amplifiers for signal enhancement, and an envelope detection circuit for pulse extraction. This segmentation allows each component to be optimized for low-level pulse detection without requiring a completely complex system redesign.
Solution Approach 2:
The system performs preliminary signal conditioning through cascaded amplification stages before envelope detection. The first amplifier boosts the weak diode detector output, and the second amplifier further enhances the signal, preparing it for accurate envelope detection and measurement of low-level pulses before they are processed further.
2Ease of operation
If standard detection apparatus is used, then the device is not portable, but portability is compromised by lack of handheld design
Solution Approach 1:
All detection components including the receiving antenna, diode detector, cascaded amplifiers, envelope detection circuit, and microprocessor are integrated into a single handheld unit. This merging of functions into one portable device maintains detection reliability while enabling easy transport and field operation for assessing electromagnetic emissions from millimeter wave scanners.
3Ease of manufacture
If existing detection technologies are used, then cost is high, but affordability is reduced by expense
Solution Approach 1:
The system employs cost-effective components such as standard diode detectors, conventional operational amplifiers, and off-the-shelf microprocessors that can be readily manufactured and replaced if needed. These components provide sufficient detection accuracy for low-level millimeter wave pulses without requiring expensive specialized equipment, making the device affordable for widespread use in safety assessments.
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 apparatus effectively detects low-level pulses of millimeter wave radiation, providing a graphical and numerical indication of energy density, ensuring that emissions are within safe limits as per IEEE standards, thereby ensuring safety and compliance.
Implementation Method 1
a receiving antenna configured to receive an input signal at one or more frequencies ranging from 10 GHz to 100 GHz
Implementation Method 2
a diode detector coupled to the receiving antenna, the diode detector providing an output voltage signal in response to the input signal
Implementation Method 3
at least two operational amplifiers cascaded sequentially and configured to receive the output voltage signal from the electromagnetic field receiver and to produce an amplified voltage signal
Implementation Method 4
an envelope detection circuit configured to receive the amplified voltage signal and to produce a reduced bandwidth, unipolar voltage signal proportional to a peak power of the input signal
Implementation Method 5
at least one low frequency operational amplifier configured to receive the reduced bandwidth, unipolar voltage signal and to produce an amplified reduced bandwidth, unipolar voltage signal
Implementation Method 6
wherein at least the electronic signal processor is encased in an electronically shielded housing
Data Source
AI summary
An apparatus for detecting low level pulses of millimeter wave electromagnetic radiation has an electromagnetic field receiver including: a receiving antenna configured to receive an input signal at one or more frequencies ranging from 10 GHz to 100 GHz, and a diode detector coupled to the receiving antenna, the diode detector providing an output voltage signal in response to the input signal. The apparatus also has an electronic signal processor. This produces an amplified voltage signal. The electronic signal processor also produces from the amplified voltage signal a reduced bandwidth, unipolar voltage signal proportional to a peak power of the input signal. The electronic signal processor uses this to produce an amplified reduced bandwidth, unipolar voltage signal. At least the electronic signal processor is encased in an electronically shielded housing.