Optical Bubble Detection Circuit for Stable Sample Pipe Sensing
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Solution Overview
Problem
Existing sample processing instruments face challenges in accurately detecting the presence of bubbles due to small voltage differences between bubble-present and bubble-absent conditions, leading to potential error detection.
Innovation Solution
A bubble detection device with a stable light path, interference-fitted sample pipe, and temperature compensation circuit to enhance detection accuracy, using a light source and photoelectric sensor aligned through specific holes in a body and cover, and a temperature sensor to adjust light source output based on ambient temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bubble detection device is added to the sample processing instrument, then bubble detection capability is provided, but detection accuracy is poor due to small voltage differences between bubble-present and bubble-absent conditions
Solution Approach 1:
The patent replaces the electrical conductivity-based detection method with an optical detection method. A light source emits light through the sample pipe, and a photodetector measures light intensity changes. Bubbles scatter and block light, causing detectable intensity variations, which provides much higher detection accuracy compared to the original electrical method with millivolt-level voltage differences.
Solution Approach 2:
The patent changes the detection parameter from electrical conductivity to optical transmission. By measuring light intensity transmission through the sample pipe instead of electrical conductivity changes, the system achieves significantly improved detection accuracy. The optical method transforms the detection mechanism to a different physical domain where bubble presence creates pronounced signal changes.
2Ease of operation
If the sample pipe is loosely positioned in the detection device, then ease of installation is improved, but detection accuracy deteriorates due to light scattering and misalignment
Solution Approach 1:
The patent incorporates a pre-alignment mechanism during device assembly. The sample pipe is positioned in a groove structure with定位 features that ensure correct alignment before the detection process begins. This preliminary positioning ensures that the light path is properly aligned when the pipe is installed, preventing light scattering and maintaining detection accuracy without requiring complex adjustment mechanisms.
Solution Approach 2:
The detection device structure itself provides alignment functionality through its groove and positioning feature design. The sample pipe automatically aligns with the light path when placed in the groove, making the alignment function self-providing rather than requiring external adjustment tools or complex mechanisms. This self-aligning design maintains precision while simplifying installation.
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
Improves bubble detection accuracy by reducing light scattering and interference, stabilizing the sample pipe, and compensating for ambient temperature changes, thereby enhancing the reliability of processing results.
Implementation Method 1
The detection circuit board includes the light source and a photoelectric sensor, wherein the body is attached to the detection circuit board, such that the light source is aligned with the first hole and the photoelectric sensor is aligned with the second hole to sense intensity of the light passing through the sample pipe
Data Source
AI summary
A bubble detection device and a sample processing instrument are provided. The bubble detection device includes a body, a cover and a detection circuit board. The body includes a bottom wall and first and second side walls respectively extending from two sides of the bottom wall. The bottom, first and second side walls define a groove for accommodating a sample pipe of a sample processing instrument, and first and second holes are respectively provided in the first and second side walls to allow light from a light source to pass through the sample pipe. The cover includes a top portion for covering the groove and first and second side portions attached to the body. The detection circuit board includes the light source and a photoelectric sensor and is attached to the body such that they are aligned with the first and second holes respectively to sense intensity of the light passing through the sample pipe. The sample processing instrument includes the bubble detection device.