CN113567602B - Testing methods and testing equipment - Google Patents
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- 238000012360 testing method Methods 0.000 title description 3
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- 238000011088 calibration curve Methods 0.000 claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims description 9
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- G01N30/68—Flame ionisation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
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Abstract
本发明提供了一种检测方法以及对应的检测设备，可以减少所需使用的标气的种类及用量，补正的运行或者操作流程更加简单，同时能够利用更加准确的校正曲线实施检测。该检测方法是使用检测设备进行测量样品中目标组分浓度的检测方法，检测设备具有保存浓度的校正曲线的存储装置，检测方法包括以下步骤：步骤a，在待补正的校正曲线中，选定第一浓度值及与第一浓度值对应的第一响应值；步骤b，使用检测设备，对目标组分的浓度已知等于第一浓度值的第一标准样品实施测量，获得第一补正值；步骤c，根据第一补正值相对于第一响应值的偏移，计算第二浓度值对应的第二补正值；步骤d，至少根据第二补正值，确定补正后的校正曲线。
The present invention provides a detection method and a corresponding detection device, which can reduce the types and amounts of standard gases required, make the correction operation or operation process simpler, and can use a more accurate calibration curve to implement detection. The detection method is a detection method that uses a detection device to measure the concentration of a target component in a sample. The detection device has a storage device for storing a calibration curve of the concentration. The detection method includes the following steps: step a, in the calibration curve to be corrected, select a first concentration value and a first response value corresponding to the first concentration value; step b, using the detection device, measure a first standard sample whose concentration of the target component is known to be equal to the first concentration value to obtain a first correction value; step c, according to the offset of the first correction value relative to the first response value, calculate a second correction value corresponding to the second concentration value; step d, at least according to the second correction value, determine the corrected calibration curve.
Description
Technical Field
The invention relates to the technical field of analysis and detection, in particular to a detection method and detection equipment.
Background
Prior art detection devices detect the concentration of a target component in a sample by detecting the response of the sample to a prescribed action or input. For example, prior art on-line monitoring devices for volatile organic compounds (Volatile Organic Compounds, VOC) with flame ionization detectors (Flame Ionization Detector, FID) utilize ionization reactions in a hydrogen-air flame to generate ion streams, and detect the concentration of VOC components in a sample gas by calculating the integrated area of the corresponding ion stream intensities for the VOC components. Specifically, since the gases with different VOC concentrations can correspondingly generate different area responses of the FID, the VOC content in the sample can be reversely estimated according to the area responses of the FID.
Some existing detection devices mark and store a correction curve when leaving a factory, compare a response value with the correction curve when detecting a response (such as intensity data, integral area data and the like) at a measurement point, and determine a measurement result of a sample concentration by searching a concentration value corresponding to the response value in the correction curve.
However, the correction curve may be shifted with a change in the environment. In the prior art, in order to correct a correction curve that deviates with environmental changes, an operation and maintenance person needs to be dispatched to a measuring point, and the correction curve is corrected in the field by using a dynamic calibrator.
In such a conventional method for correcting a correction curve, the operation flow or the operation flow is relatively complicated. In particular, when the correction curve is not straight, the correction curve cannot be fitted accurately by correction of two points, such as zero gas (zero gas) and span gas (span gas). In order to implement the multi-point correction of three or more points, an operator is required to carry a dynamic calibrator and additional standard samples, or three or more standard samples are stored or prepared by a detection device, and calibration is required to be performed on a plurality of concentration points in the corrected operation flow or operation flow.
Therefore, when the detection equipment is installed and the use environment (such as equipment displacement) is changed every time, maintenance personnel are required to reach a measurement point to correct the correction curve, more types and amounts of standard samples are required to be used in the correction process, the operation is complex, and the operation and maintenance cost is high.
Therefore, in the process of correcting a correction curve in a nonlinear form (for example, a concentration-area correction curve obtained by performing VOC measurement with FID), it is an urgent technical problem to be solved how to reduce the types and amounts of standard samples and reduce the complexity of the correction process and improve the efficiency while ensuring the accuracy of the correction.
Disclosure of Invention
Through intensive studies of the detection apparatuses in the prior art, the inventors found that some of the detection apparatuses are subjected to environmental influences, which cause the offset of the correction curve, but the offset of the correction curve generally follows a certain rule, that is, the degree of curvature of the correction curve after the offset is substantially the same as that of the correction curve before the offset.
Based on the problems and the findings, the invention provides a detection method and corresponding detection equipment, which can reduce the types and the amounts of standard gases required to be used, has simpler operation or operation flow for correcting a correction curve, and can also utilize a more accurate correction curve in a nonlinear form to carry out detection.
The invention provides a detection method for measuring the concentration of a target component in a sample by using detection equipment, wherein the detection equipment is provided with a storage device for storing a concentration correction curve, and the detection method comprises the following steps of:
Step a, selecting a first concentration value and a first response value corresponding to the first concentration value from a correction curve to be corrected;
step b, using a detection device, performing measurement on a first standard sample of which the concentration of the target component is known to be equal to a first concentration value, obtaining a first correction value;
Step c, calculating a second correction value corresponding to the second concentration value according to the offset of the first correction value relative to the first response value;
And d, determining a corrected correction curve according to at least the second correction value.
According to the detection method of the present invention, the offset of the first correction value relative to the first response value is the offset of the response value corresponding to the same concentration point. Based on the finding that the degree of curvature of the correction curve after the offset is substantially the same as that of the correction curve before the offset, the offset of one density point or a part of density points on the correction curve can be used for calculation of the offset of the correction curve up to the whole correction curve or within a prescribed range. Thus, the second correction value may be determined by calculation, rather than by experimentation.
The method for calibrating the standard samples in the prior art is replaced by a calculation method, so that the calibration steps for various standard samples, which are needed to be implemented originally, can be omitted, the use of the standard samples is saved, and the running or operation flow is simplified.
In addition, by adopting the detection method provided by the invention, the concentration value of the standard sample used in the correction is not required to be consistent or matched with the concentration point used in the multi-point correction when leaving a factory, so that the flexibility of concentration selection when preparing the standard sample is improved.
In some preferred embodiments of the present invention, step e is further included. In step e, using the detection device, performing a measurement on a second standard sample whose concentration of the target component is known to be equal to zero, obtaining a zero point correction value; in step d, a corrected correction curve is determined based on at least the second correction value and the zero point correction value.
The advantage of correcting the zero point of the calibration curve with a second standard sample whose concentration of the target component is known to be equal to zero, for example zero gas which is common for some detection devices, is that: in some technical schemes, for example, in the technical scheme of measuring the VOC concentration by using the FID, the change amplitude or the proportion of the slope is larger at the low concentration side of the correction curve, and the accuracy of the correction result on the fitting of the actual curve can be improved by using the calibration of the low concentration side of the zero gas auxiliary correction curve. In addition, the correction is completed in the mode, the traditional two-point linear correction device structure and part of software control flow can be adopted, and the reconstruction and upgrading cost of hardware or software is reduced.
In some preferred embodiments of the present invention, step f is further included. In step f, the concentration of the target component in the sample is detected using the corrected calibration curve. By using the corrected correction curve to perform detection, a more accurate detection result can be obtained.
In some preferred embodiments of the present invention, the first standard sample is a span gas of the detection device. The measuring range gas generally corresponds to a concentration point on the high concentration side, the amplitude and the variation of the response value corresponding to the concentration point on the high concentration side are large, and accordingly, the result obtained by calculating the concentration point on the high concentration side can reflect the offset or degree more accurately. In addition, the measuring range gas is usually the gas type of the detection equipment stock, so that the gas with specific concentration does not need to be prepared independently or stored for completing correction, and the method is convenient to popularize and use.
In some preferred embodiments of the present invention, the detection method includes performing the loop of steps a to d once every predetermined time interval, and storing the corrected correction curve as the correction curve currently used. By the mode, the detection equipment automatically runs the correction program at specified time intervals, on one hand, correction can be finished in the field without dispatching operation and maintenance personnel to reach the measuring point, and therefore operation and maintenance cost is reduced; on the other hand, the correction curve can be continuously and periodically updated, so that the detection equipment can correct synchronization in time after the environment changes, and the measurement accuracy is ensured.
In some preferred embodiments of the present invention, the detection device is an on-line monitoring device, and the on-line monitoring device performs step d on site at the measurement point. The correction method is carried out on the spot of the measuring point, so that the correction result can be more attached to the actual environment condition, and a correction curve which more accurately reflects the actual working condition of the measuring point is obtained.
In some preferred embodiments of the present invention, the offset in step c is a difference between the first correction value and the first response value. The second correction value is corrected by utilizing the characteristic that the difference values at different positions on the correction curve are approximately the same, so that the curvature of the corrected correction curve and the curvature of the correction curve to be corrected are kept substantially consistent.
In some preferred embodiments of the present invention, the offset in step c is a ratio of the first correction value to the first response value. The second correction value is corrected by utilizing the characteristic that the ratio values at different positions on the correction curve are substantially the same, so that the corrected correction curve can be made to adjust the response values of the concentration points in a proportional manner, thereby adjusting the degree of curvature of the correction curve in a proportional manner.
In some preferred embodiments of the present invention, the correction curve is one or a combination of a broken line, a power function curve, an exponential function curve, or a polynomial function curve. The detection method provided by the technical scheme can be suitable for correction of different types of concentration curves, particularly concentration curves in nonlinear form, and the form of the correction curve can be accurately fitted.
In some preferred technical solutions of the present invention, the correction curve to be corrected is a correction curve pre-stored when the detection apparatus leaves the factory. The detection method provided by the technical scheme is used for correcting the correction curve pre-stored in factory, so that the type and the amount of standard gas required by correcting the correction curve in the process of initializing the detection equipment can be effectively reduced, and the operation complexity of the initialization process is reduced.
In some preferred embodiments of the invention, the detection device is an on-line monitoring device having a flame ionization detector. Experiments prove that for the same FID, the bending degree of the actual curve after the deviation generated by the environmental change is basically consistent with that of the correction curve before the environmental change, so that the detection method in the technical scheme can accurately correct the correction curve of the FID.
Drawings
FIG. 1 is a schematic diagram showing the relationship between correction curves before and after correction in the prior art;
FIG. 2 is a flow chart of a detection method according to a first embodiment of the present invention;
FIGS. 3-6 are schematic diagrams of calibration curves at various stages of the detection method according to the first embodiment;
fig. 7 is a flowchart of a detection method according to a second embodiment of the present invention;
FIG. 8 is a diagram showing the relationship between correction curves before and after correction in the third embodiment of the present invention;
fig. 9 is a schematic structural diagram of an on-line monitoring device according to an embodiment of the present invention.
Reference numerals: 1-on-line monitoring equipment; 11-a flame ionization detector; 12-a controller; 13-a storage device; 131-a correction curve module; 132-curve correction module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Terms and explanations
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The term "calibration curve (calibration curve)" is a curve used to describe the quantitative relationship between the concentration or amount of a substance to be measured and the response or other indicative amount of the corresponding test device, and is typically drawn through a full analysis process using a standard sample of defined chemical composition or structure. The term "curve" is a curve in the mathematical sense and does not define that the curve must have a curvature greater than zero, in other words, "curve" encompasses straight and non-straight lines. The term "multi-point" in the "multi-point correction curve" means three or more sampling points. "concentration point" refers to a point on the calibration curve having a specific concentration value.
As used herein, the term "on-line monitoring device" refers to a device that is installed in the field at a measurement point and that performs continuous or timed monitoring of an analyte.
In addition, it should be noted that, herein, the designations of "step a", "step c", "step d", and the like are not intended to limit the order in which the steps are performed, but are merely given as a designation for convenience of description and reference. "steps a to d" means a process including "step a", "step b", "step c" and "step d", but is not limited to include only the above steps, and in some embodiments, "steps a to d" may also include steps such as "step e", "step f", and the like.
Embodiment one
Fig. 1 is a schematic diagram showing a relationship between correction curves before and after correction in the prior art, and referring to fig. 1, it can be seen that in the prior art, a detection device needs to perform multi-point correction by using a dynamic calibrator when leaving a factory, and the obtained multi-point correction curve, such as the multi-point correction curve shown by a straight line formed by connecting a plurality of concentration points in fig. 1, is determined and stored. When the detecting device is put into use and installed on the spot of the measuring point or after the detecting device is moved, the actual curve is also shifted, for example, to the position shown by the upper gray-scale curve in fig. 1, because the environment in which the detecting device is used changes.
In order to correct the multi-point correction curve, the multi-point correction curve is more consistent with the actual curve after the environmental change, the existing detection method is that an operation and maintenance person is dispatched by a manufacturer or a related party of the detection equipment, a dynamic calibrator is carried, response values of the detection equipment corresponding to a plurality of concentration points are redetermined, and then the multi-point correction curve is fitted according to the redetermined response values, such as the multi-point correction curve shown by a broken line formed by connecting the concentration points in fig. 1.
However, the detection method adopted in the prior art is complex to operate, and each concentration point needs to correspondingly carry, store or prepare the standard sample with corresponding concentration, so that the variety and the dosage requirements of the standard sample are increased.
The inventors have conducted intensive studies on the detection apparatuses in the related art to solve the above-described problems in the related art, and have found that, under the influence of a change in the use environment or the like, the correction curves of some detection apparatuses are shifted, but the shifting of the correction curves generally follows a certain rule, that is, the degree of curvature of the correction curves after shifting is substantially the same as that of the correction curves before shifting. Based on the above problems and findings, the present embodiment provides a new detection method of a correction curve.
The detection device to which the detection method provided in this embodiment is applicable is a detection device for measuring the concentration of a target component in a sample, and the specific measurement method is not limited, and for example, measurement or statistics may be performed with respect to mathematical parameters, optical parameters, electromagnetic parameters, acoustic parameters, thermodynamic parameters, or any other suitable mathematical, physicochemical parameters.
The target component may be a volatile organic compound or any other suitable component. Volatile Organic Compounds (VOCs) may be measured using index parameters including, but not limited to, the following types: total Volatile Organic (TVOC), total Organic Gas (TOG), non-methane organic gas (NMOG), hydrocarbon (THX), non-methane total hydrocarbon (NMHC), benzene (BTX), or the like.
The detection method according to the present embodiment will be described with reference to fig. 2, and the detection method according to the present embodiment includes the steps of:
Step a, selecting a first concentration value c1 and a first response value A1 corresponding to the first concentration value c1 from a correction curve to be corrected;
Step b, using a detection device, performing measurement on a first standard sample with the concentration of the target component equal to a first concentration value c1, and obtaining a first correction value;
Step c, calculating a second correction value corresponding to the second concentration value according to the offset of the first correction value relative to the first response value;
And d, determining a corrected correction curve according to at least the second correction value.
Fig. 3 is a schematic diagram of a calibration curve drawn for explaining step a in the detection method according to the first embodiment of the present invention. Referring to fig. 3, first, a correction curve to be corrected is illustrated, in which a first density value c1 and a first response value A1 corresponding to the first density value c1 are selected through step a.
The correction curve to be corrected is a concentration correction curve stored in the detection device, for example, a correction curve pre-stored when the detection device leaves a factory or a correction curve corrected once.
When the first concentration value c1 is selected in the step a, the first concentration value c1 may be determined according to a concentration value of a standard sample of the detection device itself or a concentration value of another standard sample which is in communication with the detection device, for example, if the detection device itself has or the detection device is in communication with several standard samples of different concentrations, one standard sample of an appropriate concentration may be selected as the first standard sample, and the first concentration value c1 may be determined accordingly according to the concentration of the first standard sample, for example, a concentration value equal to the concentration of the target component in the first standard sample may be selected as the first concentration value c1. Of course, in some embodiments, the standard sample may also be temporarily formulated by the detection device or carried by the operation and maintenance personnel, in which embodiments the first concentration value c1 may also be set manually or by reading data.
After the first concentration value c1 is determined, a first response value A1 corresponding thereto is determined. The first response value A1 may be obtained by calculation or search using a correction curve, or may be obtained by searching a data table corresponding to the correction curve, and the specific calculation or search method is not limited.
The unit of the first response value A1 may be a physicochemical unit obtained by direct detection by the detection device, for example, a unit of the specific parameter described above, such as a mathematical unit, an optical unit, an electromagnetic unit, an acoustic unit, a thermodynamic unit, or any other suitable mathematical or physicochemical unit, or may be another type of unit obtained by statistics or processing according to the measurement result of the detection device or a unit after homogenization processing.
Fig. 4 is a schematic diagram of a calibration curve drawn for explaining the first step b in the detection method according to the first embodiment of the present invention, and referring to fig. 4, after the first response value A1 is determined, the first step b is performed, i.e., measurement is performed on the first standard sample whose concentration of the target component is known to be equal to the first concentration value c1 using the detection apparatus, thereby obtaining the first correction value A1s.
In other words, in step b, measurement of the whole analysis process is performed using the first standard sample whose target component is the concentration c1, and the response (or statistics of the response, processing results) of the detection device is obtained as the first correction value A1s. The first correction value A1s has the same unit as the first response value A1, but the correction curve often shifts due to factors such as environmental changes, and the like, and a1s+.a1 is typical.
The first standard sample may be a pre-formulated or stored standard sample with known concentration ratios of the components, or a standard sample with known concentrations of only a portion of the components (including the target component to be measured). The concentration of the target component being "known" means that the detection device stores or is able to read the concentration of the target component in the standard sample.
Fig. 5 is a schematic diagram of a calibration curve drawn for explaining step c in the detection method according to the first embodiment of the present invention. In the detection method according to the first embodiment of the present invention, step c is performed after the first correction value A1s is obtained, that is, the second correction value A2s corresponding to the second concentration value c2 is calculated at least according to the offset of the first correction value A1s with respect to the first response value A1.
Referring to fig. 5, the offset of the first correction value A1s with respect to the first response value A1 indicates the degree of offset of the first correction value A1s with respect to the first response value A1, and the form of the offset is not limited. The offset may be represented by an amount including, but not limited to, for example, in some embodiments, the offset may be represented in the form of a difference ΔA (A1 s-A1 or A1-A1 s); in other embodiments, the offset may also be expressed in terms of a ratio A1s/A1 or A1/A1 s; in other embodiments, the degree of offset may also be expressed in terms of variations or combinations of the two forms, e.g., to
(A0 represents a response value corresponding to zero point in the correction curve to be corrected, A0s represents a zero point correction value obtained by measuring a standard sample having a concentration of zero), and the offset is represented in the form.
The second correction value A2s may be obtained by jointly calculating the offset (for example, an offset expressed in the form of Δa or ratio) and the second response value A2, for example, by superimposing the same difference Δa or multiplying the same ratio value A1s/A1 on the basis of the second response value A2. In some embodiments, the ratio value may also be adjusted to the ratio value shown in formula (1).
To complete the determination of the multi-point correction curve, it is generally necessary to determine correction values corresponding to three or more density points. In some embodiments, the manner of determining the other correction value may take over the manner of determining the second correction value A2s, or in other embodiments, the correction value corresponding to the other concentration point may be determined based at least in part on the offset between the second correction value A2s and the second response value A2.
Referring to fig. 6, after the determination of the correction values corresponding to all the concentration points to be determined is completed, step d is performed to determine a corrected correction curve at least according to the second correction value A2 s.
The detection method provided in this embodiment is described above. In the present embodiment, the calculation of the offset of the correction curve can be performed along the entire correction curve or within a predetermined range based on the finding that the degree of curvature of the correction curve after the offset is substantially the same as that of the correction curve before the offset. So that the second correction value A2s can be determined computationally, but not experimentally.
According to the detection method in the embodiment, the calculation method is used for replacing the method for calibrating the standard samples in the prior art, so that the calibration steps for various standard samples, which are needed to be implemented originally, can be omitted, the use of the standard samples is saved, and the running or operation flow is simplified.
In addition, referring to fig. 3 to 6, it can be seen that, by adopting the detection method provided in the present embodiment, the concentration value (i.e., c 1) of the standard sample used in the calibration does not need to be matched with the concentration point used in the multi-point calibration when leaving the factory, thereby improving the flexibility of concentration selection when preparing the standard sample.
As described above, the correction curve pre-stored at the time of shipment is corrected by using the detection method provided by the present embodiment, so that the types and the amounts of standard samples required for correcting the correction curve at the time of initializing the detection device can be effectively reduced, and the operation complexity of the initialization process can be reduced. By correcting the correction curve corrected before using the detection method provided by the embodiment, the correction curve can be kept continuously updated, so that the correction curve can be continuously matched with the environmental change.
Second embodiment
Fig. 7 is a flowchart of a detection method in the second embodiment of the present invention.
The embodiment provides a detection method, which comprises the following steps:
Step a, selecting a first concentration value c1 and a first response value A1 corresponding to the first concentration value c1 from a correction curve to be corrected;
step b, using a detection device, performing a measurement on a first standard sample whose concentration of the target component is known to be equal to a first concentration value c1, obtaining a first correction value A1s;
step e, using a detection device to measure a second standard sample with the concentration of the target component known to be equal to zero, and obtaining a zero point correction value A0s;
Step c, calculating a second correction value A2s corresponding to the second concentration value c2 according to the offset of the first correction value A1s relative to the first response value A1;
Step d, determining a corrected correction curve at least according to the second correction value A2s and the zero point correction value A0 s;
and f, detecting the concentration of the target component in the sample by using the corrected correction curve.
In this embodiment, step e may be performed before step a, or may be performed after step a and before step d. Step d may be performed after any one of step a, step b, step c or step e. Step c may be performed after step b. In other embodiments of the present invention, the above steps may be changed according to need, and there is no particular execution sequence requirement.
According to the above embodiment, the zero point of the calibration curve is corrected by using a second standard sample whose target component concentration is known to be zero, for example, zero gas which is normally supplied to some detection devices. The advantages are that: since the change amplitude or the proportion of the slope is larger on the low concentration side (the side with smaller concentration value) of the correction curve, if the calibration on the low concentration side of the correction curve is assisted by using the second standard sample, the accuracy of the correction result on the actual curve fitting can be improved. In addition, the correction is completed in the mode, the traditional two-point linear correction device structure or part of software control flow can be used, and the improvement and upgrading cost of hardware or software can be reduced. Further, by performing the detection using the corrected correction curve, a more accurate detection result can be obtained.
Embodiment III
On the basis of the second embodiment, the third embodiment of the present invention further provides a detection method. The detection method of the third embodiment is different from that of the second embodiment in that the first standard sample used is a span gas of the detection apparatus.
The other components are the same as those of the second embodiment, and will not be described in detail here.
Fig. 8 is a schematic diagram showing a relationship between correction curves before and after correction in the third embodiment of the present invention.
Table 1 illustrates the parameters of the correction curve to be corrected.
TABLE 1
The parameters of the corrected correction curve are shown in table 2.
TABLE 2
In this embodiment, a case where a multipoint correction curve is a broken line is exemplified. The broken line comprises a plurality of sections of straight lines which are connected end to end, and the expression of each section of straight line can be deduced based on the parameters. For example, for a straight line in the range of concentration 4 to concentration 5, it can be obtained from the K value and the B value, and the specific expression is:
A＝(c-c4)*K+B＝(c-c4)*(A1s/A1)*(A5-A4)/(c5-c4)+A4*(A1s/A1)
Wherein a represents a response value of the detection device to the sample, for example, an area value of the flame ionization detector 11; c represents the concentration of the sample; a2 to A5 are response values corresponding to the concentration points c2 to c5 in the correction curve to be corrected.
According to the parameters, the expression of each section of straight line in the multi-point correction curve can be obtained, and the whole correction curve is obtained through integration.
Referring to fig. 8, since the span gas generally corresponds to the concentration point on the high concentration side, the magnitude and the amount of change of the response value corresponding to the concentration point on the high concentration side are both large, and accordingly, the result obtained by calculation using the concentration point on the high concentration side can also reflect the amount or degree of offset more accurately. In addition, the measuring range gas is usually the gas type of the detection equipment, so that the gas with specific concentration does not need to be independently prepared or stored for completing correction, and the detection equipment is convenient to execute and operate.
In the first to third embodiments, the corrected correction curve may be determined based on the first correction value A1s and the second correction value A2 s. Since the first correction value A1s is used as the calculation of the second correction value A2s on the one hand and as the determination of the correction curve on the other hand, which corresponds to substituting the actually obtained first correction value A1s into the two-step calculation, the weight of the first correction value A1s in the calculation process is increased, thereby making the correction result more accurate.
In some embodiments of the present invention, the detection method includes executing steps a to d once every predetermined time interval, and storing the corrected correction curve as the correction curve currently used. By the mode, the detection equipment automatically runs the correction program at specified time intervals, on one hand, correction can be finished in the field without dispatching operation and maintenance personnel to reach the measuring point, and the operation and maintenance cost is reduced; on the other hand, the correction curve is continuously updated, so that the detection equipment can keep synchronous with the environmental change, and the measurement accuracy is improved. The predetermined time interval may be, for example, one day, one week or one month, and may be flexibly adjusted according to the intensity of the environmental change at the measurement point, without particular limitation.
In some embodiments of the present invention, the detection device is an on-line monitoring device 1, and the measurement site of the on-line monitoring device 1 may be a place where personnel are not normally living, such as near a factory, near a sewage disposal site, near a river, near a scenic spot, etc. Even if the on-line monitoring device 1 is installed in these places, the on-line monitoring device 1 can realize real-time remote control detection and monitoring by receiving and transmitting detection information or detection results by communication means or devices. At this time, the detection method related to any one embodiment of the present invention is used for the on-line monitoring device 1, so that the on-site correction can be completed without dispatching operation and maintenance personnel to reach the measurement point, and the continuous real-time stable operation monitoring of the on-line monitoring device 1 is ensured while the operation and maintenance cost is reduced. Further, the correction curve is continuously and automatically corrected and updated and stored at predetermined time intervals, so that maintenance of the on-line monitoring apparatus 1 can be remotely managed and grasped.
In some embodiments of the invention, the correction curve is one or a combination of a polyline, a power function curve, an exponential function curve, or a polynomial function curve. The detection method provided by the embodiment of the invention can be suitable for correction of concentration curves of different types, particularly nonlinear forms, and the forms of the correction curves exemplified above can be fitted more accurately.
In embodiments one to three, the detection device may be an on-line monitoring device 1 having a flame ionization detector 11. Experiments prove that the bending degree of the actual curve after the deviation generated by the environmental change is basically consistent with that of the correction curve before the environmental change for the same flame ionization detector 11, so the correction curve of the flame ionization detector 11 can be accurately corrected by the detection method in the technical scheme.
The present embodiment also provides a detection apparatus for performing detection using the above method, for example, an on-line monitoring apparatus 1 having a flame ionization detector 11.
Referring to fig. 9, the on-line monitoring apparatus 1 includes a flame ionization detector 11, a controller 12, and a storage device 13, wherein a correction curve module 131 is stored in the storage device 13, and the correction curve module 131 stores a correction curve or a data table and a function relationship corresponding to the correction curve. The storage device 13 further stores a curve correction module 132, the curve correction module 132 has instructions for the controller 12 to read and operate, and by operating the instructions of the curve correction module 132, the controller 12 can control the on-line monitoring device 1 to execute the correction method of the correction curve in the first to third embodiments.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (11)
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