Optical Fiber Probe Setting Evaluation for Living Body Measurement
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Solution Overview
Problem
Conventional optical measurement apparatuses for living bodies fail to accurately evaluate the setting of optical fiber probes, leading to erroneous measurements and reduced diagnosis efficiency due to inadequate fiber settings, where insufficient light penetration results in incorrect assessment of hemoglobin signals.
Innovation Solution
An optical measurement apparatus with a light irradiation and detection system using modulated light, signal processing to calculate hemoglobin concentration, and an evaluation mechanism that assesses the adequacy of optical fiber settings based on the peak magnitude of hemoglobin signal statistics, specifically using the fourth order statistic Kfo to determine the center frequency and peak steepness, thereby correcting the evaluation of fiber settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical fiber probes are attached to the body surface for measurement, then measurement capability is provided, but setting adequacy cannot be accurately evaluated leading to erroneous measurements
Solution Approach 1:
The system performs preliminary measurements to evaluate the setting adequacy of optical fiber probes and provides feedback on whether the probes are properly positioned. This feedback mechanism allows the system to identify and exclude inadequately set probes before actual measurement, ensuring reliable measurements only from properly positioned probes.
Solution Approach 2:
The system performs a preliminary measurement phase before actual measurement to assess the setting adequacy of optical fiber probes. During this preliminary phase, the system calculates hemoglobin concentration values and evaluates whether each probe is adequately set, allowing for pre-screening of probe quality before main measurement begins.
2Productivity
If optical fiber probes are inadequately set, then measurement channels are formed, but sufficient light penetration does not occur resulting in incorrect hemoglobin signal assessment
Solution Approach 1:
The system continuously monitors the quality of light penetration through preliminary measurements and provides feedback on probe setting adequacy. When a probe is found to be inadequately set (unable to penetrate sufficient light), the system identifies this through statistical evaluation of hemoglobin signal characteristics and excludes the affected measurement channels.
Solution Approach 2:
The system replaces direct mechanical assessment of probe positioning with an optical-based evaluation method. By measuring light penetration characteristics and analyzing hemoglobin signal statistics, the system indirectly assesses probe setting adequacy without requiring direct mechanical inspection or adjustment.
3Reliability
If preliminary measurement is performed for setting evaluation, then setting adequacy can be assessed, but measurement time is increased
Solution Approach 1:
The system performs setting evaluation during the preliminary measurement phase, which is conducted before actual measurement begins. This preliminary action allows the system to identify and exclude inadequately set probes in advance, ensuring that only reliable measurement channels are used during the main measurement period.
Solution Approach 2:
The system uses feedback from preliminary measurements to guide the measurement process. By evaluating setting adequacy beforehand and providing feedback on which channels are reliable, the system can efficiently proceed with measurement only on adequately set probes, reducing overall measurement time compared to continuously monitoring and adjusting during the measurement process.
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
Ensures accurate evaluation and judgment of optical fiber settings, preventing erroneous diagnoses by distinguishing between adequate and inadequate settings, and eliminating mixed measurement data from inadequately set channels.
Implementation Method 1
a light irradiation means including an irradiation use optical fiber which irradiates light subjected to different modulation from a light irradiation position to a living body
Implementation Method 2
a light detection means including a light receiving use optical fiber which detects light penetrated inside the living body at a detection position and outputs an electrical signal corresponding to the amount of light detected
Implementation Method 3
a sufficient near infrared light, which is subjected to absorption and reflection by hemoglobin inside the living body can be detected
Data Source
AI summary
An optical fiber setting adequacy evaluation unit is disclosed for evaluating a setting adequacy on a body surface in an inspection area of irradiation use optical fibers. The evaluation unit can also be used for setting the accuracy of light receiving use optical fibers at both ends of respective measurement channels in an optical measurement apparatus for living body. The evaluation unit evaluates the setting adequacy on the body surface of a subject of the irradiation use optical fibers or of light receiving use optical fibers for the respective measurement channels. The evaluation is performed based on pulse wave intensities of the respective measurement channels calculated by a pulse wave calculation unit. The pulse wave calculation unit calculates intensities of the pulse wave due to heartbeats of a subject contained in hemoglobin signals of the respective measurement channels calculated by a hemoglobin signal calculation unit.