UVGI Luminaire Motion Sensor Safety Control
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Solution Overview
Problem
Exposure to ultraviolet radiation, particularly UV-C, poses a risk of eye and skin damage in areas where disinfection systems are used, necessitating a solution to safely manage UVGI exposure in environments where humans are present.
Innovation Solution
A luminaire with an ultraviolet radiation source and an optical sensor that detects motion or presence, switching off the radiation source when an object is detected within its field of view, ensuring safe operation by limiting exposure to harmful UV radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ultraviolet radiation sources are used for disinfection in spaces where humans are present, then disinfection effectiveness is improved, but the risk of eye and skin damage increases
Solution Approach 1:
The optical sensor detects the presence or motion of objects (humans, animals) before the ultraviolet radiation source is activated. By performing detection in advance and only switching on the UV source when the field of view is clear, the system prevents harmful exposure before it can occur, resolving the contradiction between disinfection effectiveness and safety.
2Object-affected harmful factors
If sensors are used to detect objects and switch off ultraviolet radiation, then safety is improved, but unnecessary deactivation of the system occurs
Solution Approach 1:
The optical sensor is configured with a specific field of view that covers only the immediate area around the ultraviolet radiation source where harmful exposure would occur. This localized detection approach allows the system to distinguish between objects in the dangerous radiation zone and objects elsewhere, preventing unnecessary deactivation while maintaining safety in the critical area.
3Reliability
If the field of view of the optical sensor covers the entire field of irradiation, then detection reliability is improved, but device complexity increases
Solution Approach 1:
A single optical sensor performs multiple functions: it detects both the presence of objects and provides control signals for switching the ultraviolet radiation source on and off. By making the optical sensor multi-functional, the system achieves reliable detection without adding separate control sensors or complex control circuitry, thus resolving the contradiction between detection reliability and device 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
This design provides a compact and reliable solution that prevents unnecessary deactivation of UVGI systems, allowing safe operation near the luminaire by interrupting UV radiation only when a person or animal enters the irradiation field, thus minimizing exposure risks while maintaining effective disinfection capabilities.
Implementation Method 1
an optical sensor having a field of view... configured to detect motion or presence of an object in the field of view
Implementation Method 2
Ultraviolet germicidal irradiation (UVGI) is a disinfection method that uses ultraviolet radiation, particularly short-wavelength ultraviolet radiation such as ultraviolet C or UV-C radiation, to kill or inactivate microorganisms by destroying nucleic acids
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
:The present invention relates to a luminaire (100) emitting ultraviolet radiation. The luminaire (100) comprises (i) an ultraviolet radiation source (110) having a field of irradiation, (ii) an optical sensor (120) having a field of view, the optical sensor (120)being configured to detect motion or presence of an object in the field of view and to output a signal indicative of detected motion or presence of the object is detected, (iii) a control unit 5(130) configured to control the ultraviolet radiation source (110) based on the signal from the optical sensor (120), the control unit (130) being connected to the ultraviolet radiation source (100) and being configured to switch off the ultraviolet radiation source (110) upon receipt of the signal indicative of detected motion or presence of the object, and (iv) an optical system (140) configured to shape the field of irradiation of the ultraviolet radiation source (110) and 10the field of view of the optical sensor (120). The ultraviolet radiation source (110) and the optical sensor (120) are both located upstream of the optical system (140) such that the field of irradiation of the ultraviolet radiation source (110) falls within the field of view of the optical sensor (120) downstream of the optical system (140). The luminaire (100) may be used for performing an ultraviolet germicidal irradiation (UVGI) disinfection method.