Far Infrared Lens Set for Night Surveillance
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Solution Overview
Problem
Conventional surveillance systems face complexity in detecting targets using visible light, especially in poor visibility conditions like smoke, haze, or at night, highlighting the need for improved far-infrared imaging capabilities to effectively monitor targets based on temperature differences.
Innovation Solution
A far-infrared imaging lens group comprising a first meniscus convex lens and a second biconvex lens, both made of ZnSe, with specific curvature radii and thicknesses, arranged along a principal axis, integrated with a barrel forming a far-infrared imaging objective lens, and paired with a thermal receiver for enhanced detection in low-light environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional active detection systems (visible light, infrared light, ultraviolet light) are used for surveillance, then detection capability is provided, but system complexity and layout difficulty increase significantly
Solution Approach 1:
The patent extracts and utilizes the passive infrared radiation emitted naturally by targets, eliminating the need for active illumination sources and complex detection systems. By focusing on the thermal radiation that targets emit spontaneously, the system achieves reliable detection without the complexity of active detection components.
Solution Approach 2:
The patent introduces a specialized far-infrared lens group as an intermediary component that efficiently transmits and focuses thermal radiation from targets to the detector. This intermediary optical system enables passive detection by bridging the gap between the target's emitted radiation and the detector, simplifying the overall system architecture.
2Illumination intensity
If visible light sources are used for surveillance, then imaging is possible, but penetration capability through smoke, haze, and darkness is poor
Solution Approach 1:
The patent changes the operating wavelength parameter from visible light to far-infrared region. This parameter change enables the system to detect thermal radiation emitted by targets, providing imaging capability independent of visible light conditions and achieving penetration through smoke, haze, and darkness where visible light fails.
Solution Approach 2:
The patent transitions from detecting visible light (one type of electromagnetic radiation) to detecting far-infrared thermal radiation (different 'color' in the electromagnetic spectrum). This shift allows the system to perceive targets through their thermal emission rather than reflected visible light, overcoming environmental obstacles that block visible light.
3Object-affected harmful factors
If far-infrared monitoring is implemented to detect targets through temperature differences, then detection in poor visibility conditions is improved, but imaging capability and temperature resolution requirements become more stringent
Solution Approach 1:
The patent segments the optical system into multiple lens elements with specific curvature radii and thicknesses, where each element contributes to the overall focal length and imaging quality. This segmentation allows precise control of the optical path to achieve the required imaging capability and temperature resolution while maintaining practical manufacturing feasibility.
Solution Approach 2:
The patent specifies precise parameter values for lens curvature radii (e.g., first surface: 2.4×(1±5%) mm, second surface: 2×(1±5%) mm) and thicknesses to optimize the optical system's performance. These controlled parameter variations enable the system to meet stringent imaging and temperature resolution requirements while accounting for manufacturing tolerances.
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 enables high imaging capability and temperature resolution, allowing for effective detection of distant targets in night, fog, and other challenging environments, such as fire control and monitoring, by focusing far-infrared light onto a thermistor for precise temperature difference imaging.
Implementation Method 1
a far infrared imaging lens group includes a first lens and a second lens arranged in sequence along a principal axis... the first surface, the second surface, and the third surface are convex surfaces facing an object side, the fourth surface is a convex surface facing an image side
Implementation Method 2
Monitoring the target using the characteristics of ultra-infrared light emitted by the target itself... Far-infrared monitoring typically involves the use of a temperature difference between the radiation source and the environment
Data Source
AI summary
A far infrared detector and objective lens and lens set thereof. The far infrared imaging lens set (10) comprises a first lens (100) and a second lens (200) arranged in sequence along a principal axis; the first lens (100) has a first curved surface (102) having a radius of curvature of 2.4×(1±5%) mm and a second curved surface (104) having a radius of curvature of 2×(1±5%) mm; the second lens (200) has a third curved surface (202) having a radius of curvature of 50×(1±5%) mm and a fourth curved surface (204) having a radius of curvature of 60×(1±5%) mm; wherein the first curved surface (102), the second curved surface (104), the third curved surface (202), and the fourth curved surface (204) are arranged in sequence; the first curved surface (102), the second curved surface (104) and the third curved surface (202) are all convex to the object side, and the fourth curved surface is convex to the image side. Distant targets can be detected in dark and foggy environments, and imaging capability is high.