Photometric Immersion Probe with Adaptive Impulse Integration

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Existing photometric process measurement systems struggle to provide precise parameter concentration results for both clear and turbid water samples due to limitations in the number of flashlight source flashes and the saturation voltage of impulse signal integrators, leading to suboptimal signal-to-noise ratio and accuracy in A/D conversion.

Innovation Solution

A photometric process measurement arrangement with a photometric immersion probe that adapts the number of integrated cycle impulses and A/D conversion intervals based on water turbidity, using a combination of high-precision and low-precision conversions, and a cycle pattern table to maintain consistent data volume and accuracy across varying turbidity levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the number of flashlight source flashes is increased to improve signal-to-noise ratio for turbid water, then measurement precision improves, but the time period between consecutive parameter concentration results increases

Engineering Contradiction:
Improveparameter concentration result accuracyVSAvoidtime period between measurement results
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The system dynamically adapts the number of integrated cycle impulses based on water turbidity conditions. For clear water, fewer impulses (4-16) are integrated to maintain fast measurement cycles around 200ms. For turbid water, more impulses (32-128+) are integrated to achieve sufficient signal-to-noise ratio despite the increased measurement time exceeding 1000ms. This dynamic adaptation resolves the contradiction by optimizing the measurement parameters according to actual water conditions.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system changes the integration parameter (number of impulses) based on water turbidity. The impulse signal integrators accumulate electrical impulses from detection elements over varying numbers of flashlight source flashes, adapting the integration duration and impulse count to match water clarity conditions, thereby achieving optimal measurement precision across different turbidity levels while managing measurement time.

Inventive Principle:
Principle #35Parameter changes

2Measurement precision

If the number of A/D conversion results is increased to improve accuracy through averaging, then measurement precision improves, but the time period between measurement results increases

Engineering Contradiction:
Improveparameter concentration result accuracyVSAvoidtime period between measurement results
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The system performs a compulsory A/D conversion after each impulse integration cycle to obtain minimum required measurement results in a timely manner. Additionally, optional supplementary A/D conversions are performed to gather extra data points for averaging, improving accuracy when time permits. This partial/excessive action approach ensures timely measurements while opportunistically enhancing precision.

Inventive Principle:
Principle #16Partial or excessive action

Solution Approach 2:

The system maintains continuous measurement operations by performing compulsory A/D conversions after every impulse integration cycle, ensuring uninterrupted parameter monitoring. Supplementary A/D conversions are also performed continuously when possible, creating a stream of measurement data that can be averaged to improve accuracy without significant time penalty.

Inventive Principle:
Principle #20Continuity of useful action

3Measurement precision

If the capacity of impulse signal integrators is maximized to optimize signal-to-noise ratio, then measurement precision improves, but the adaptability to different turbidity levels decreases

Engineering Contradiction:
Improvesignal-to-noise ratioVSAvoidadaptability to different water turbidity
Core Design Contradiction:
Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The system uses multiple impulse signal integrators with different capacities rather than a single fixed-capacity integrator. Each integrator is optimized for specific turbidity ranges, allowing the system to adapt to different water conditions by selecting the appropriate integrator. This dynamic configuration maintains high signal-to-noise ratio across varying turbidity levels while preserving adaptability.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system employs multiple wavelength-selective detection elements, each with its own impulse signal integrator, allowing different integrators to handle different wavelength ranges and turbidity conditions. This multi-functional approach enables the system to optimize signal-to-noise ratio for specific conditions while maintaining overall adaptability across diverse water quality scenarios.

Inventive Principle:
Principle #6Universality (Multi-functionality)

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 ensures precise and efficient determination of water parameters by optimizing the measurement cycle length and A/D conversion intervals, maintaining accuracy and reducing the time gap between results for both clear and turbid samples.

Implementation Method 1

the flashlight source is a high voltage gas-discharge lamp, more preferably a xenon flashlight lamp

Methodology Applied
Scientific EffectGas-discharge lamp emission: Electric Arc

Implementation Method 2

A state-of-the art immersion probe comprises a photometer flashlight source for providing photometric light impulses and comprises a photometric detector arrangement with at least two separate wavelength-selective detection elements

Methodology Applied
Scientific EffectPhotoelectric effect: Photoelectric Effect

Implementation Method 3

The impulse signal integrators are capacitors having a saturation voltage which must not be exceeded during the integration process

Methodology Applied
Scientific EffectCapacitance: Capacitance

Data Source

PatentUS20250314528A1A photometric process measurement arrangement and a photometric measurement method
Publication Date: 2025.10.09 HACH LANGE HACH LANGE
  • US20250314528A1 patent drawing
  • US20250314528A1 patent drawing
  • US20250314528A1 patent drawing

AI summary

A photometric process measurement arrangement and a photometric measurement method The invention refers to a photometric process measurement arrangement (10) comprising a photometric immersion probe (20) comprising a photometer flashlight source (61) for providing photometric light impulses, a photometric detector arrangement (70) comprising a separate wavelength-selective detection element (71, 72, 73), and a photometer control (80) controlling the photometer flashlight source (61) and the detector arrangement (70), The photometer control (80) comprises: An impulse signal integrator (819, 829, 839) for integrating the electric impulses having the impulse intensity (Ui) generated by the detection element (71, 72, 73) of one impulse integration cycle (204; 221; 264), a measurement cycle control (90) for adapting the total number of 20 integrated cycle impulses of an impulse integration cycle (204;221;264) to the impulse intensity (Ui) of the single electric impulses, an A/D-converter (81, 82, 83) for converting the voltage of the impulse signal integrator (819, 829, 839) in an optional compulsory A/D conversion interval (100) after the impulse integration cycle (204;221;264), and an A/D-conversion management module (150) for balancing the total number of A/D conversion intervals (100-111) within a time frame (F), whereas the number of supplementary A/D conversion intervals (101-111) after the compulsory A/D conversion interval (100) depends on the length of the corresponding impulse integration cycle (204; 221; 264).