Optical Gas Sensor Seal for Environmental Isolation
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Solution Overview
Problem
Existing optical gas sensors are prone to errors due to external environmental factors such as humidity, temperature, and air pressure, which affect the light source and light receiver, leading to inconsistent light emission and reception, resulting in inaccurate gas concentration measurements and potential false alarms.
Innovation Solution
The optical gas sensor device incorporates a seal with an optical filter that transmits infrared rays, mounted on a substrate, which encloses the light source or light receiver, reducing external environmental influences by using a protective cover with a vent that is blocked with adhesive after heat treatment, ensuring consistent light emission and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light source and light receiver are exposed on the printed circuit board, then the device structure is simple and easy to manufacture, but the external environment (humidity, temperature, air pressure) significantly affects the light emission and reception, leading to measurement errors
Solution Approach 1:
The patent applies a seal structure that encloses the light source and light receiver, protecting them from external environmental factors. The seal acts as a protective barrier that isolates the sensitive optical components from humidity, temperature fluctuations, and air pressure changes, thereby maintaining measurement precision while allowing the device to be manufactured on a printed circuit board.
Solution Approach 2:
The seal creates a controlled internal environment for the light source and light receiver, effectively isolating them from the external atmosphere. This inert environment prevents harmful interactions between the optical components and external environmental factors, ensuring stable light emission and reception characteristics.
2Device complexity
If the light source is exposed, then the device structure is simple, but the light emission intensity varies with environmental conditions, causing gas concentration measurements to deviate from actual values
Solution Approach 1:
The seal structure provides a protective enclosure for the light source, maintaining a stable internal environment that isolates the light emission characteristics from external environmental variations. This ensures reliable and consistent light emission intensity regardless of external conditions.
Solution Approach 2:
The seal acts as a pre-established protective barrier that cushions the light source against environmental fluctuations before they can affect light emission. By providing this protective buffer in advance, the system maintains reliable operation without requiring complex real-time compensation mechanisms.
3Device complexity
If the light receiver is exposed, then the device structure is simple, but the light reception is affected by external environment, resulting in larger errors and potential false alarms
Solution Approach 1:
The seal encloses the light receiver, protecting it from external environmental factors that would otherwise interfere with light reception. This protective enclosure maintains consistent detection performance by isolating the receiver from humidity, temperature, and air pressure variations.
Solution Approach 2:
The seal creates a controlled internal atmosphere for the light receiver, eliminating harmful interactions with external environmental conditions. This inert environment ensures that the light reception characteristics remain stable and reliable for accurate gas concentration measurement.
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 configuration minimizes the impact of external environments on the light source and receiver, providing accurate gas concentration measurements and reducing the risk of false alarms by maintaining consistent light emission and reception.
Implementation Method 1
an optical filter that transmits the infrared rays
Implementation Method 2
a light source that emits infrared rays to a gas as a detection target
Implementation Method 3
a light receiver that detects infrared rays incident via the optical filter and generates a detection signal
Implementation Method 4
A decrease in air pressure means that the number of molecules in the air that collide with the heater surface of the light source is reduced, so that less heat is lost from the heater
Data Source
AI summary
Disclosed is an optical gas sensor device that includes: a light source that emits infrared rays to a gas as a detection target; an optical filter that transmits the infrared rays; a light receiver that detects infrared rays incident via the optical filter and generates a detection signal; and a first substrate, the optical gas sensor device including a seal in which the optical filter is installed and which seals the light source or the light receiver. The seal is mounted on the first substrate.