Rotating Passive Infrared Sensor Fresnel Lens Dynamic Detection
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Solution Overview
Problem
Existing passive infrared detection systems lack the ability to dynamically adjust their detection range and sensitivity, which can lead to reduced accuracy and efficiency in detecting human presence in varying environments.
Innovation Solution
A passive infrared detection apparatus equipped with a Fresnel lens and a rotation unit that allows the passive infrared sensor and Fresnel lens to rotate together, enabling adjustable detection zones and sensitivity through radial sensitive and blind zones, and a control system that utilizes voltage signals from the sensor to determine object presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single passive infrared sensing unit with a Fresnel lens is used, then the detection scope is increased, but the detection accuracy and sensitivity cannot be dynamically adjusted
Solution Approach 1:
The passive infrared sensor is divided into multiple sensing units (first, second, third, and fourth sensing units) arranged in a specific pattern. Each sensing unit can independently detect infrared signals, allowing the system to segment the detection field into different zones with varying sensitivity levels, thereby enabling dynamic adjustment of detection sensitivity across different areas.
Solution Approach 2:
The invention introduces a rotational dimension by mounting the passive infrared sensor on a rotation mechanism. This allows the sensor array to rotate and scan the environment, adding temporal and spatial dimensions to the detection capability. The rotation enables the system to dynamically adjust which sensing units are active and how they are oriented, providing adaptability in detection sensitivity and coverage.
2Device complexity
If the passive infrared sensor remains stationary, then the structure is simple, but the detection accuracy in varying environments is reduced
Solution Approach 1:
The invention transforms the stationary sensor into a dynamic system by incorporating a rotation mechanism. The passive infrared sensor can now rotate to different angles and positions, allowing it to adapt to varying environmental conditions and target locations. This dynamic capability significantly improves detection accuracy by enabling the sensor to actively scan and track infrared sources rather than passively monitoring a fixed area.
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
Enhances detection accuracy and sensitivity by dynamically adjusting the detection range and sensitivity based on environmental conditions, allowing for effective human detection and control of building systems such as lighting and HVAC.
Implementation Method 1
the passive infrared sensing unit will produce a voltage based on a change in the radiation intensity
Implementation Method 2
A passive infrared sensor comprises a single passive infrared sensing unit and a Fresnel lens at its front end
Implementation Method 3
the Fresnel lens is used for converging infrared rays with specific wavelengths, for example infrared radiation emitted by a human body, to the passive infrared sensing unit
Data Source
AI summary
The present application provides a detection apparatus and a control system, wherein the detection apparatus comprises a passive infrared sensor and a Fresnel lens provided on the passive infrared sensor, and wherein the detection apparatus further comprises a rotation unit, the rotation unit being capable of driving the passive infrared sensor and the Fresnel lens to rotate together. The detection apparatus of the present application can be used for controlling lamplight, air conditioner, heating and ventilation in a building or can be used for security, etc.