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Self-tuning event detection

An event-adaptive technology, applied to measurement devices, computer components, instruments, etc., can solve problems such as incorrect results

Inactive Publication Date: 2021-06-08
SENSIRION AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, this simple gating has the disadvantage that when the overall state of the environment changes significantly (e.g., by more than one standard deviation), especially when environmental sensors are moved to different places (as is the case in mobile devices) , will lead to incorrect results

Method used

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  • Self-tuning event detection
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Examples

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Embodiment Construction

[0074] figure 1 An example time series of raw signals 11 (ie raw data values) measured by environmental sensors and optionally preprocessed, eg by a calibration algorithm, is shown. In the example time series, the raw signal 11 fluctuates around some constant value (not shown), while some raw data values ​​are far apart, ie significantly above or below this constant value. Raw data values ​​that deviate so significantly (eg, by more than one or more than two standard deviations from the mean / average of the raw signal) are indicated as outliers.

[0075] also, figure 1 The lower and upper thresholds 12 determined without any gating are shown. The threshold 12 at a particular time is calculated as the mean plus (for an upper threshold) and minus (for a lower threshold) respectively the standard deviation of all raw data values ​​for a defined period of time preceding that particular time. A known problem is that Threshold 12 is highly dependent on outliers, i.e. raw data valu...

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Abstract

A method is provided for processing environmental sensor data comprising the following steps. One or more raw data values are received from an environmental sensor, an average value and a measure of dispersion are determined over a defined time period only from raw data values between a lower threshold and an upper threshold, and the lower threshold and the upper threshold are redefined depending on the average value and the measure of dispersion. The method may be used in an environmental sensor, e.g. a MOX sensor or a VOC sensor, and implemented as a computer program.

Description

technical field [0001] A method for processing environmental sensor data as well as a corresponding computer program and a corresponding environmental sensor are provided. Background technique [0002] Sensors are often used to measure physical quantities of the environment, such as the concentration of gases or volatile organic compounds (VOCs), humidity or temperature. Such sensors are denoted ambient sensors and may in particular be metal oxide (MOX) sensors, eg for measuring gas concentrations. Environmental sensors transform measured physical quantities into raw data values ​​measured at successive points in time, such as voltage or ticks. [0003] Environmental sensor data can be used to perform "state estimation," that is, to estimate statistics (eg, mean, variance, or standard deviation) from raw data values. Such state estimates are commonly used for VOC content, in particular for classifying an environment according to its VOC content or for providing a VOC level...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G08B21/12
CPCG01N33/0004G01N33/0062G01N33/0065G08B21/12G06F18/10G01N33/0047
Inventor S·迪西尔
Owner SENSIRION AG