Container Inspection Light Source Frequency Control
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Solution Overview
Problem
Existing container inspection systems using LED lighting can cause epileptic seizures due to flash frequencies within the range of 3 to 15 Hz, particularly at container speeds like 37,000 per hour, posing health risks to operators.
Innovation Solution
A container inspection device and method that adjusts the light source frequency to ensure it is perceived as constantly shining by observers, using a control signal to superimpose a secondary flash frequency outside the critical range, thereby avoiding harmful frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the light source flashes at a frequency corresponding to the container stream speed (e.g., 10.27 Hz at 37,000 containers per hour), then the inspection process can operate efficiently at high speeds, but this can cause epileptic seizures in susceptible persons
Solution Approach 1:
The light source is configured to flash periodically at a frequency that is a multiple of the container stream speed (e.g., 2x, 3x, 4x the base frequency). This maintains the inspection synchronization while moving the flash frequency away from the critical 3-15 Hz range that triggers epileptic seizures, thus resolving the contradiction between high-speed inspection and operator safety
Solution Approach 2:
The system dynamically adjusts the light source flash frequency parameter based on the container stream speed. By changing the frequency parameter to always be outside the critical range (either higher than 15 Hz or synchronized to appear constant), the system maintains both high productivity and safety without compromising inspection efficiency
2Object-affected harmful factors
If the light source is driven to flash at frequencies outside the critical range (e.g., >15 Hz or constant appearance), then operator safety is ensured, but the light source cannot illuminate containers at the optimal inspection frequency
Solution Approach 1:
The light source flashes periodically at frequencies that are integer multiples of the container stream speed (2x, 3x, 4x). This ensures that each container is illuminated multiple times during its passage through the inspection zone, maintaining adequate inspection accuracy while keeping the flash frequency outside the critical epileptic range
Solution Approach 2:
The system ensures continuous illumination of containers by using multiple light sources or extended illumination periods within each flash cycle. This compensates for the reduced flash frequency, ensuring that every container receives sufficient light exposure for accurate inspection while maintaining safe operating frequencies
Data Source
AI summary
A container inspection device and a container inspection device for inspecting containers are provided. The container inspection device comprises at least one light source for illuminating containers in an inspection clock for inspecting the containers. The container inspection device drives the at least one light source such that the at least one light source is observed by a person as constantly shining independent of the inspection clock.