Blast Sensor Light Attenuation Gel for False Detection
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Solution Overview
Problem
Blast sensors face false detection issues due to sensitivity to sunlight and changing atmospheric conditions, leading to inaccurate impulse noise or shock wave event measurements.
Innovation Solution
A light attenuation material, specifically a pigmented gel with controlled thickness and pigment concentration, is applied over the sensing element of blast sensors to reduce light transmission and prevent false detections while maintaining performance in detecting impulse noise or shock wave events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blast sensor is exposed to the external environment to detect impulse noise or shock wave events, then the sensor can detect blast exposure, but light transmission causes false detection of impulse events
Solution Approach 1:
A light attenuation material is introduced as an intermediary layer between the external environment and the sensing element. This material selectively blocks light transmission while allowing acoustic and shock wave signals to pass through, thereby mediating the harmful light interference without compromising the sensor's ability to detect impulse noise or shock wave events.
Solution Approach 2:
The light attenuation material is applied specifically to cover the sensing element or the opening of the blast sensor, providing localized protection against light interference. This selective coverage ensures that only the critical sensing area is protected, while maintaining the sensor's overall detection capability for impulse events.
2Object-affected harmful factors
If a light attenuation material is applied over the sensing element to reduce false detection, then false alarms from light changes are eliminated, but sensor performance may be compromised
Solution Approach 1:
The light attenuation material's properties (such as material composition, thickness, and optical density) are carefully selected and adjusted to achieve the optimal balance between light blocking capability and acoustic signal transmission. By changing these parameters, the material effectively reduces false detection from light changes while maintaining the sensor's sensitivity to genuine impulse noise or shock wave events.
3Reliability
If the sensor is protected from environmental conditions, then false detection is reduced, but the sensor's exposure to impulse events may be limited
Solution Approach 1:
The light attenuation material serves as a selective intermediary that differentiates between harmful environmental factors (light) and useful detection targets (acoustic impulses and shock waves). It blocks light transmission to prevent false detection while remaining transparent to acoustic signals, thereby protecting the sensor from light interference without limiting its exposure to genuine impulse events.
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 effectively eliminates false alarms caused by light changes without compromising the sensors' ability to detect impulse noise or shock wave events, ensuring accurate measurements and reducing the risk of noise-induced hearing loss and traumatic brain injury.
Implementation Method 1
A light attenuation material, specifically a pigmented gel with controlled thickness and pigment concentration, is applied over the sensing element of blast sensors to reduce light transmission
Data Source
AI summary
Systems and methods to reduce light transmission to a sensing element of a blast sensor are disclosed, including a light attenuation material to cover at least a portion of the blast sensor to reduce false detection of impulse noise or shock wave events by the sensing element of the blast sensor. The light attenuation material can include a pigmented gel having a specific pigment concentration and thickness to reduce false detection of events while maintaining performance of detection of impulse noise or shock wave events.