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CN-121994710-A - Combustible gas noninductive detection camera system integrated with spectrum sensor

CN121994710ACN 121994710 ACN121994710 ACN 121994710ACN-121994710-A

Abstract

The invention discloses a flammable gas noninductive detection camera system integrating a spectrum sensor, which relates to the technical field of gas imaging detection and comprises the steps of firstly establishing multi-source observation by sharing reference measurement frames of at least partial optical links with a main imaging light path, outputting a fixed reference region statistical abstract, a temperature observation vector and a reference data effective mark, updating a drift state quantity based on the statistical abstract and the temperature observation vector and generating a stability field, then carrying out drift compensation on an infrared image sequence according to the drift state quantity and the stability field to generate an operation envelope field, a quantization result, a confidence interval and error source decomposition, and finally executing gate control output and writing back scheduling parameters. The scheme realizes continuous connection of reference observation, drift estimation, quantitative judgment and feedback scheduling, and improves output stability, quantitative reliability and continuous operation capability under the fixed online detection condition.

Inventors

  • ZHU DAPING
  • JIANG HAI

Assignees

  • 江苏斯普埃尔数字科技有限公司

Dates

Publication Date
20260508
Application Date
20260408

Claims (10)

  1. 1. The utility model provides a combustible gas noninductive detection camera system of integrated spectrum sensor, includes the infrared image sequence of acquisition at least two spectral ranges and carries out gas detection, its characterized in that includes: triggering reference sampling, generating a reference measurement frame sharing at least part of optical links with a main imaging optical path, and extracting a fixed reference area statistical abstract, a temperature observation vector and a reference data effective mark; Updating drift state quantity comprising channel gain drift and channel bias drift according to the statistical abstract, the temperature observation vector and the reference data effective mark, generating a stability field, and freezing the updating when the reference data effective mark is invalid; Performing drift compensation on the infrared image sequence based on the drift state quantity and the stability field, and generating an operation envelope field, a quantization result, a confidence interval and error source decomposition; and decomposing and executing gating output according to the operation envelope field, the stability field, the confidence interval and the error source, and taking the updated scheduling parameters as the input of the next cycle.
  2. 2. The combustible gas non-sensing imaging system according to claim 1, wherein: generating a reference measurement frame in response to reaching a preset reference sampling time, detecting that the change rate of the ambient temperature exceeds a threshold value and triggering events in the switching of the working state of equipment; and when saturation, shielding or insufficient pixel number of the fixed reference area occurs, marking the current reference sample as invalid, and sequentially executing delayed resampling, switching a standby reference path and outputting a reference unavailable state.
  3. 3. The combustible gas non-sensing imaging system according to claim 2, wherein: when the reference measurement frame is generated, the reference measurement frame and the corresponding infrared image are kept to adopt the same integration time, the same analog gain and the same non-uniform correction version, and the reference measurement frame index, the fixed reference area statistics abstract, the temperature observation vector and the reference data effective mark are assembled into a unified input record according to the fixed field sequence.
  4. 4. The combustible gas non-sensing imaging system according to claim 3, wherein: According to the reference measurement frame index alignment fixed reference area statistics abstract and temperature observation vector, constructing a drift state quantity comprising channel gain drift and channel bias drift, and decomposing the drift state quantity into a slow variable corresponding to environmental heat balance change and a fast variable corresponding to short-time disturbance; and generating a stability field according to the updated drift state quantity, wherein the stability field at least comprises fixed reference region residual statistics and a span consistency index.
  5. 5. The combustible gas non-inductive detection imaging system of claim 4, wherein: When the effective mark of the reference data is invalid or the stability field exceeds a preset threshold value, the freezing drift state quantity is updated, the channel gain drift and the channel bias drift corresponding to the last effective version are kept unchanged, and simultaneously, the version mark and the statistical abstract corresponding to the current drift state quantity are output, and the freezing reason is recorded.
  6. 6. The combustible gas non-inductive detection imaging system of claim 5, wherein: The method comprises the steps of carrying out drift compensation on an infrared image sequence according to a drift state quantity to form a multispectral radiation representation, extracting background contrast, distance, view field configuration and plume movement proxy quantity from the multispectral radiation representation to generate an operation envelope field, writing unstable information into the envelope field when the stability field shows instability, and identifying and dividing a plume region according to the operation envelope field.
  7. 7. The combustible gas non-inductive detection imaging system of claim 6, wherein: Calculating the concentration path length and the velocity field based on the plume region, and determining the boundary flux according to the velocity field when the leakage rate is required; When the plume segmentation confidence is insufficient, the velocity field is not converged or the operation envelope field exceeds the effective boundary, only qualitative warning and positioning information is output, and the current dominant error item is synchronously output.
  8. 8. The combustible gas non-inductive detection imaging system of claim 7, wherein: And outputting a quantized result, a confidence interval, an operation envelope field, a stability field and an event record index in the quantized output state, outputting qualitative alarm and positioning information in the limited output state, and outputting an alarm and maintenance prompt in the invalid output state.
  9. 9. The combustible gas non-inductive detection imaging system of claim 8, wherein: When the writing of the event record fails, the current sampling event is switched to a limited output state, the quantization result is forbidden to enter a report link, and meanwhile, the corresponding positioning information and abnormal source fields are reserved.
  10. 10. The combustible gas non-sensing imaging system of claim 9, wherein: Updating the scheduling parameters according to the dominant error item and the drift residual level in the error source decomposition, wherein the reference sampling period is shortened when the drift residual rises, the execution sequence of uncertainty propagation is adjusted when the calculation load exceeds a threshold value, the updated scheduling parameters are written back, and meanwhile, the field sequence of a gating judging chain and an event recording chain is kept unchanged.

Description

Combustible gas noninductive detection camera system integrated with spectrum sensor Technical Field The invention relates to the technical field of gas imaging detection, in particular to a flammable gas noninductive detection camera system integrated with a spectrum sensor. Background The leakage sources in the chemical industry park, the storage and transportation station, the pipe gallery, the loading and unloading area and other places are concentrated and are mostly located at high places and in explosion-proof areas, manual inspection is difficult, PTZ is adopted to realize multi-machine-position 24/7, remote alarming and recording, the system can be linked with DCS/SCADA to form event records and running accounts and data archiving, and site temperature daily and night circulation, heat source disturbance, rain, fog, dust, window pollution, condensation and the like are engineering constraints affecting long-term property and quantization precision. For example, US10684216B2 discloses a multi-spectral gas quantization and differentiation method for optical gas imaging cameras. In the method, a multispectral optical gas imaging camera collects a single multispectral radiation image, image pixels comprise detection radiation information of different wavebands, background radiation is estimated for at least one pixel in the calculation process, a gas concentration-optical path integral value (OM-m.m along the optical path integral value) is calculated according to the detection radiation and the background radiation, and an alarm is sent out after an alarm condition is met. The multi-spectral band configuration can comprise a reference band positioned outside a target gas absorption window and a working band covering the absorption window, background radiation estimation is carried out by establishing a relation model of the working band detection radiation and the reference band detection radiation, calculating the working band background radiation under the condition of gas or no gas by using the model, setting a species distinguishing threshold in a species distinguishing scene so as to avoid false alarm caused by interference gas, and outputting an alarm in a display or acousto-optic/communication mode. The prior art is only suitable for fixed 24/7 low maintenance deployment conditions, and the stability of quantitative calculation needs the stability of camera radiation response and multiband relation model, when a system uses a non-refrigeration detector and manual calibration is absent for a long time, the sensitivity and bias of the detector can generate thermal drift along with the ambient temperature, slow drift along with the aging of a device, window pollution/condensation changes the optical transmittance, and an optical filter is influenced by temperature and stress to generate effective band offset. The relative response relation between the reference wave band and the working wave band caused by drift deviates from modeling assumption, system response change is mixed in the detected radiation change, so that systematic deviation or long-period fluctuation is generated in a concentration-optical path integral value, the background of a superimposed scene is strong and unstable (heat source, solar reflection, steam/dust shielding, wind-induced plume shape change and the like), model mismatch is amplified more easily, and event review and report caliber inconsistency are caused. Therefore, the technical problem to be solved at present is how to ensure consistency of multi-spectrum band/spectrum imaging quantification output under complex environment disturbance and low maintenance constraint in cross-temperature-domain and long-term operation. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides a flammable gas noninductive detection shooting system integrated with a spectrum sensor, which updates a drift state quantity and generates a stability field based on a statistical abstract and a temperature observation vector, then carries out drift compensation on an infrared image sequence according to the drift state quantity and the stability field to generate an operation envelope field, a quantization result, a confidence interval and an error source decomposition, and finally executes gating output and writes back scheduling parameters. The scheme realizes continuous connection of reference observation, quantitative judgment and feedback scheduling, improves output stability, quantitative reliability and continuous operation capability under the fixed online detection condition, and solves the technical problems recorded in the background technology. (II) technical scheme In order to achieve the above purpose, the invention is realized by the following technical scheme: the utility model provides a combustible gas noninductive detection camera system of integrated spectrum sensor, includes the infrared image sequence of