CN107345828B - Liquid level detection method, device and system - Google Patents
Liquid level detection method, device and system Download PDFInfo
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- CN107345828B CN107345828B CN201710638651.7A CN201710638651A CN107345828B CN 107345828 B CN107345828 B CN 107345828B CN 201710638651 A CN201710638651 A CN 201710638651A CN 107345828 B CN107345828 B CN 107345828B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
Abstract
The invention provides a liquid level detection method, a liquid level detection device and a liquid level detection system, and relates to the field of biological medical treatment. The liquid level detection method includes: obtaining first signal data for each of the two or more probes used in combination; adjusting the first signal data to obtain second signal data of the two or more probes used together, so that the absolute value of the difference value between the second signal data of the two or more probes used together is larger than a preset signal threshold value; acquiring the adjusted working signal value of each operating point of each probe; obtaining a detection change threshold value corresponding to each probe by using the adjusted working signal value and absolute change amount of each operating point of each probe; and determining whether each probe contacts the liquid level to be detected according to the adjusted working signal value of the current working point of each probe and the detection change threshold corresponding to each probe. The technical scheme in the embodiment of the invention can improve the accuracy of the detection result of the probe.
Description
Technical Field
The invention relates to the field of biomedical treatment, in particular to a liquid level detection method, a liquid level detection device and a liquid level detection system.
Background
In the biomedical field, it is often necessary to perform an analysis on a liquid. The probe for sucking liquid in the liquid analysis device is driven by the motor to move downwards or upwards in the liquid containing container. To prevent the probe from hitting the bottom of the liquid container and sucking unnecessary liquid, the probe sucks the liquid when the probe touches the liquid level of the liquid in the liquid container.
In some analytical experiments, two or more additions of reagents are required. When using single probe during operation, need aim at first liquid with single probe, control single probe descends, absorbs first liquid after, single probe resets. And aligning the single probe to the second liquid, controlling the single probe to descend, and resetting the single probe after sucking the second liquid. In the case that liquid needs to be added twice or more, the liquid is sucked by using a single probe, and the risk that the liquid is mutually polluted by the single probe is higher. Also, the time taken to aspirate the two liquids is long, which slows down the speed of the analytical experiment. In order to avoid mutual liquid pollution of single probe and increase the speed of analysis experiment, double probes are adopted to work synchronously at the present stage, or more probes are adopted to work synchronously.
Currently, it is required to detect whether the probe contacts the liquid level through a change in parameter data output from the probe. For example, the liquid level detection is performed by using a capacitance change type liquid level detection, that is, based on a change in capacitance of a probe. However, the variation of environmental factors and different individual differences affect the parameter data output by the probes, and in the case of a double probe or a larger number of probes, the probes are likely to interfere with each other, which also reduces the accuracy of the parameter data output by the probes. So that the accuracy of liquid level detection is lowered.
Disclosure of Invention
The embodiment of the invention provides a liquid level detection method, a liquid level detection device and a liquid level detection system, which can improve the accuracy of a detection result of a probe.
In a first aspect, an embodiment of the present invention provides a liquid level detection method, including: obtaining first signal data for each of the two or more probes used in combination; adjusting the first signal data to obtain second signal data of the two or more probes used together, so that the absolute value of the difference value between the second signal data of the two or more probes used together is larger than a preset signal threshold value; acquiring the adjusted working signal value of each operating point of each probe; obtaining a detection change threshold corresponding to each probe by using the adjusted working signal value and absolute change amount of each operating point of each probe, wherein the absolute change amount is a signal value change amount meeting the minimum detection dead volume; and determining whether each probe contacts the liquid level to be detected according to the adjusted working signal value of the current working point of each probe and the detection change threshold corresponding to each probe.
in a second aspect, an embodiment of the present invention provides a liquid level detection apparatus, including: an acquisition module configured to acquire first signal data of each of the two or more probes used in combination; an adjustment module configured to adjust the second signal data of the two or more probes used in combination obtained from the first signal data so that an absolute value of a difference between the second signal data of the two or more probes used in combination is greater than a preset signal threshold; the acquisition module is configured to acquire the adjusted working signal value of each operating point of each probe; a processing module configured to obtain a detection change threshold corresponding to each probe by using the adjusted working signal value and absolute change amount of each working point of each probe, wherein the absolute change amount is a signal value change amount meeting a minimum detection dead volume; and the determining module is configured to determine whether each probe contacts the liquid level to be detected according to the adjusted working signal value of the current working point of each probe and the detection change threshold corresponding to each probe.
in a third aspect, an embodiment of the present invention provides a liquid level detection system, which includes two or more probes used together, and a liquid level detection device in the foregoing embodiments.
The embodiment of the invention provides a liquid level detection method, a liquid level detection device and a liquid level detection system. Second signal data is obtained by adjusting the first signal data for each probe. The absolute value of the difference between the second signal data for different probes is greater than a preset signal threshold. The interference caused by the same or similar signal data of different probes is avoided. And then obtaining a detection change threshold value corresponding to the probe based on the adjusted working signal value of each working point of each probe. The adjusted working signal value of each working point of each probe is related to environmental factors and different individual differences. And introducing the adjusted working signal value of each working point of each probe into the calculation of a detection change threshold value, and taking the multi-probe interference, environmental factors and different individual differences into consideration in liquid level detection judgment. Therefore, the accuracy of the signal data output by each probe is improved, and the accuracy of the detection result of each probe is improved.
drawings
The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.
FIG. 1 is a schematic structural diagram of a dual-needle detection device for liquid level detection according to an embodiment of the present invention;
fig. 2 is a flowchart of a signal processing method according to an embodiment of the present invention;
FIG. 3 is a flow chart of a liquid level detection method according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a filter circuit according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for detecting a liquid level according to another embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a liquid level detecting device according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a liquid level detecting device according to another embodiment of the present invention;
Fig. 8 is a schematic structural diagram of a liquid level detection system according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.
References in the present application to "one embodiment," "an embodiment," "various embodiments," "an example," etc., indicate that the embodiment(s) or example(s) described may include a particular feature, structure, or characteristic, but every embodiment or example need not necessarily include the particular feature, structure, or characteristic. Moreover, repeated usage of the phrase "in one example" does not necessarily refer to the same example, although it may.
In the embodiment of the present invention, in order to avoid the mutual contamination of liquids in the analysis experiment using a single probe, and to increase the speed of the analysis experiment, the dual probes may be used together, or a larger number of probes may be used together. In the case of using two or more probes together, the probes are likely to interfere with each other, and the influence of interference between the probes is increased due to environmental factors and individual differences between the probes, so that the accuracy of signal data output from each probe is reduced. Thereby causing the accuracy of the detection result of the probe to be lowered.
the liquid level detection method and the liquid level detection device in the embodiment of the invention can reduce the mutual interference between the probes caused by environmental factor change and different individual differences under the condition of two or more probes, thereby ensuring that the accuracy of the detection result of the probes is improved. In one example, the signal processing method and apparatus in the embodiments of the present invention may be used for liquid level detection. For example, fig. 1 is a schematic structural diagram of a dual-needle detection device for liquid level detection according to an embodiment of the present invention. As can be seen from fig. 1, the two-pin probing apparatus includes two probes, probe a and probe B. Probe a and probe B may be descended, stopped, or reset. The working signal values of the probe A and the probe B are collected respectively, and the working signal values are directly detected or are detected after being processed, so that whether the probe A and the probe B contact the liquid level to be detected or not is judged. The environmental factors for liquid level detection can vary, and the detection of different probes can have certain individual differences. During the operation of the two probes, the operation signal values output by the probe a and the probe B may interfere with each other. Therefore, the accuracy of the working signal value output by the probe A and the working signal value output by the probe B is low. According to the liquid level detection method and device in the embodiment of the invention, the signal data of the probe is adjusted, and the detection change threshold value for determining whether the probe is in contact with the liquid level to be detected is obtained based on the adjusted working signal value of the probe. Thereby avoiding interference between probe a and probe B.
Fig. 2 is a flowchart of a signal processing method according to an embodiment of the present invention. As shown in fig. 2, the signal processing method includes:
first signal data for each of the two or more probes used in combination is acquired, step 101.
In step 101, two or more probes used in combination can be independently controlled. For example, two or more probes used in combination may operate at different speeds or may operate at different motions. For example, one of the probes is descending and the other probe is being repositioned. Of course, the operating speed of two or more probes used in combination may also be the same. The two or more probes used in combination may also be operated in synchronism.
the first signal data for each probe may include one signal value or may include a plurality of signal values, and is not limited thereto.
and step 102, adjusting the first signal data to obtain second signal data of the two or more probes used together, so that the absolute value of the difference value between the second signal data of the two or more probes used together is larger than a preset signal threshold value.
In one example, the second signal data may be generated by adjusting a circuit hardware structure that generates the signal data, such that the second signal data is generated by the adjusted circuit hardware structure.
in another example, the second signal data may be generated by adjusting a software algorithm that produces the signal data such that the second signal data is generated by the adjusted software algorithm.
The second signal data may include one signal value or may include a plurality of signal values, which is not limited herein. The second signal data corresponds to the first signal data.
After the adjustment, the absolute value of the difference between the second signal data of different probes is larger than the preset signal threshold. If the second signal data is a signal value, the preset signal threshold is greater than 0, and the adjusted second signal data of different probes are different. For example, two probes are provided, and before adjustment, the second signal data of each of the two probes is 20. After the adjustment, the second signal data of one probe is 10, and the second signal data of the other probe is 20. Alternatively, after the adjustment, the second signal data of one probe is 10, and the second signal data of the other probe is 30.
if the second signal data includes a plurality of signal values, a value range of the signal value in the second signal data of each probe can be obtained according to the plurality of signal values in the second signal data of each probe. That is, the second signal data may be a signal value interval. The pre-set signal threshold may be such that the second signal data for each probe do not overlap. For example, there are two probes, and before the adjustment, the second signal data of each of the two probes is 10 to 20. The preset signal threshold is 20, after adjustment, the second signal data of one probe is 10 to 20, and the second signal data of the other probe is 40 to 50. Or, the preset signal threshold is 20, and after adjustment, the second signal data of one probe is 20 to 30, and the second signal data of the other probe is 50 to 60.
The detection result of the probe depends on the signal data of the probe. If the signal data of different probes are too close, mutual interference can be caused, so that the signal data output by the probes are offset due to the interference. For example, if the signal data of the probes are oscillation frequency data, the oscillation frequency data of different probes are too close to cause mutual interference, so that the accuracy of the oscillation frequency data of the probes and other data, such as capacitance, obtained according to the oscillation frequency data is reduced.
And 103, acquiring the adjusted working signal value of each operating point of each probe.
the operating points are points taken at different positions and/or at different times during the operation of the probe. The number of the operation points may be determined by accuracy requirements and experience, and may be one or more, and is not limited herein. The operation of the probe may include descending, stopping and resetting. That is, the operating signal values may be collected at different locations or at different points in time during the descent, stopping and resetting of each probe.
In step 103, the working signal value of each operation point of each probe is acquired after the adjustment to obtain the second signal data. The collected operating signal values for the respective operating points should be within the range of the second signal data.
And 104, obtaining a detection change threshold value corresponding to each probe by using the adjusted working signal value and the adjusted absolute change amount of each working point of each probe.
Wherein the absolute change amount is a change amount of the signal value satisfying a minimum detection dead volume.
In one example, the adjusted operating signal values for the respective operating points of each probe may be collected over a predetermined time period. The number of the operation signal values of each operation point may be one, or may be two or more. The working signal value can be a capacitance value, a capacitance slope or a capacitance resonance frequency between the probe and the signal reference surface.
In one example, the trend of the operation signal value can be obtained according to the adjusted operation signal value of each operation point of each probe. Based on the trend and the absolute variation of the working signal value, a detection variation threshold corresponding to each probe is obtained. For example, an average value of the adjusted operation signal values at the respective operation points of each probe is calculated, and a difference between the average value of the operation signal values at the respective operation points of each probe and the absolute change amount is used as a detection change threshold corresponding to each probe.
In one example, it may also be determined whether the current liquid level detection is the first liquid level detection after the liquid level detection device is powered on. If the current liquid level detection is the first liquid level detection after the liquid level detection device is powered on, the detection change threshold corresponding to each probe can be obtained according to the adjusted working voltage value of each working point of each probe and the absolute change amount, which are obtained by the first liquid level detection after the liquid level detection device is powered on.
in one example, if it is determined that the current liquid level detection is not the first liquid level detection after the liquid level detection device is powered on, the detection change threshold corresponding to each probe may be obtained according to the adjusted operating signal value of each operating point of each probe collected in the current liquid level detection process, the adjusted operating signal value of each operating point of each probe collected in the previous liquid level detection process, and the absolute change amount.
And 105, determining whether each probe contacts the liquid level to be detected or not according to the adjusted working signal value of the current working point of each probe and the detection change threshold corresponding to each probe.
In one example, if the adjusted working signal value of the current working point of a certain probe is greater than or equal to the detection change threshold corresponding to the probe, it is determined that the probe contacts the liquid level to be detected.
In one example, if the adjusted working signal value of the current working point of a certain probe is smaller than the test change threshold corresponding to the probe, it is determined that the probe does not contact the liquid level to be measured.
In one example, if the probe is determined to contact the liquid level to be measured, the probe is controlled to stop moving. And if the probe is determined not to contact the liquid level to be detected, controlling the probe to continuously descend until the probe is determined to contact the liquid level to be detected.
According to the embodiment of the invention, the second signal data is obtained by adjusting the first signal data of each probe. The absolute value of the difference between the second signal data for different probes is greater than a preset signal threshold. The interference caused by the same or similar signal data of different probes is avoided. And then obtaining a detection change threshold value corresponding to the probe based on the adjusted working signal value of each working point of each probe. The adjusted working signal value of each working point of each probe is related to environmental factors and different individual differences. And introducing the adjusted working signal value of each working point of each probe into the calculation of a detection change threshold value, and taking the multi-probe interference, environmental factors and different individual differences into consideration in liquid level detection judgment. Therefore, the accuracy of the signal data output by each probe is improved, and the accuracy of the detection result of each probe is improved.
fig. 3 is a flowchart of a liquid level detection method according to another embodiment of the invention. Fig. 3 is different from fig. 2 in that step 101 in fig. 2 can be specifically subdivided into step 1011 and step 1012 in fig. 3, and the liquid level detection method in fig. 3 can further include step 106 and step 107.
And step 1011, acquiring the working signal value of each working point of each probe.
in one example, the working signal value may be an oscillation frequency value, a wavelength value, a capacitance value, and other data values, which are not limited herein.
Step 1012, obtaining first signal data of each probe according to the working signal value of each working point of each probe.
And integrating the working signal values of the working points to obtain first signal data of each probe. The first signal data may be a signal value or a signal value interval. For example, the working signal value is set as the oscillation frequency value. If the number of operating points is one and the operating signal value of the probe at the operating point is 12MHz, the first signal data of the probe may be 12 MHz. For another example, the working signal value is set as the oscillation frequency value. If the number of the operation points is two or more, and the operation signal values of the respective operation points of the probe include 12MHz, 13MHz, 14MHz, and 18MHz, the first signal data of the probe may be 12MHz to 18 MHz.
The operating signal values for each operating point may also be calculated and integrated to obtain first signal data for each probe. For example, if the working signal value is the oscillation wavelength value, the oscillation frequency value can be calculated according to the oscillation wavelength value. And integrating the oscillation frequency values to obtain first signal data.
the first signal data may be oscillation frequency data, oscillation wavelength data, or the like, which may cause signal interference, and is not limited herein.
in one example, the second signal data is a signal value or a signal value interval. And second signal data between two or more probes used does not overlap at all. For example, two probes, probe A and probe B, are provided in combination. The second signal data of probe A is f1 to f2, and the second signal data of probe B is f3 to f 4. Then f 1-f 2 and f 3-f 4 do not have an overlapping region.
The second signal data may be oscillation frequency data, oscillation wavelength data, or the like, and is not limited herein.
in one example, the second signal data includes oscillation frequency data. Adjusting the first signal data to obtain the second signal data of the two or more probes used in combination may be implemented by adjusting oscillation frequency parameters of the two or more probes used in combination to obtain oscillation frequency data of the two or more probes used in combination. The oscillation frequency parameter is a parameter capable of influencing oscillation frequency data. For example, the oscillation frequency parameter may include at least one of a resistance, a capacitance, and an inductance in the oscillation circuit.
In one example, if the level detection system is a capacitive level detection system. And calculating the capacitance of the probe by using the obtained oscillation frequency data, so as to judge whether the probe is in contact with the liquid level to be detected by using the capacitance variation of the probe.
in one example, if the oscillation circuit is an RC oscillation circuit, the resistance value and/or capacitance value in the RC oscillation circuit may be changed, thereby changing the oscillation frequency data so that the oscillation frequency data of different probes do not overlap at all. The oscillation frequency data may be an oscillation frequency value or an interval of oscillation frequency values. Specifically, the modulation of the oscillation frequency data can be realized by referring to a relational expression (1) of the oscillation frequency data, the resistance value and the capacitance value in the RC oscillation circuit and adjusting the resistance value and/or the capacitance value. The relation (1) is as follows:
Wherein f is oscillation frequency data, R is a resistance value, and C is a capacitance value.
in another example, if the oscillation circuit is an LC oscillation circuit, the inductance value and/or the capacitance value in the LC oscillation circuit may be changed, thereby changing the oscillation frequency data so that the oscillation frequency data of different probes do not overlap at all. The oscillation frequency data may be an oscillation frequency value or an interval of oscillation frequency values. Specifically, the adjustment of the oscillation frequency data can be realized by referring to a relational expression (2) between the oscillation frequency data and the inductance and capacitance values in the LC oscillation circuit and adjusting the inductance and/or capacitance values. The relation (2) is as follows:
Wherein f is oscillation frequency data, L is inductance value, and C is capacitance value.
And 106, judging whether the adjusted working signal value of each working point of each probe is within the range of the effective signal value.
wherein, due to the influence of environmental factors or mutual interference among different probes, the collected working signal value of the probe may be noise. In order to avoid the influence on the detection result caused by the noise influence prediction change threshold, the collected and adjusted working signal values of each working point of each probe need to be filtered, and the noise in the working signal values is filtered.
In filtering noise, a range of valid signal values needs to be set. Due to changes in environmental factors, such as temperature, humidity or air pressure around the probe. The valid working signal value may also change slightly, such that the range of the valid working signal value and the second signal data is shifted, but the changed working signal value is still the valid working signal value. In order to be able to obtain more effective working signal values, an effective signal value range may be set on the basis of the range of the second signal data.
The difference between the maximum value of the effective signal value range and the maximum signal value in the second signal data is less than or equal to a preset effective threshold, and the difference between the minimum value of the effective signal value range and the minimum signal value in the second signal data is less than or equal to a preset effective threshold. The first preset effective threshold and the second preset effective threshold may be equal to or different from each other, and are not limited herein.
In one example, the first preset effective threshold and the second preset threshold are both equal to 0. It is indicated that the valid signal value range completely overlaps the second signal data. That is, the second signal data is taken as the valid signal value range.
In another example, the first preset effective threshold is greater than 0 and the second preset effective threshold is equal to 0. It means that the range of valid signal values is slightly enlarged on the basis of the second signal data. The specific first preset effective threshold and the second preset effective threshold may be determined empirically. The first preset effective threshold and the second preset effective threshold of the effective signal value range relative to the range of the second signal data under the current environmental factors can be obtained by collecting a plurality of working signal values within a period of time and counting the plurality of working signal values.
Step 107, filtering out the working signal values outside the effective signal value range.
The working signal values outside the range of the effective signal values can be regarded as invalid signal values and can be filtered.
In one example, a filter circuit may be utilized to filter out operating signal values that are outside of a range of valid signal values. For example, fig. 4 is a schematic structural diagram of a filter circuit according to an embodiment of the present invention. The filter circuit shown in fig. 4 is an RC passive band-pass filter circuit, and is composed of resistors R1 and R2 and capacitors C1 and C2, and can filter out working signal values outside the effective signal value range. The left side of the RC passive band-pass filter circuit in fig. 4 is the input terminal and the right side is the output terminal.
Of course, the filter circuit may also be an LC filter circuit or an active filter circuit, and is not limited herein.
In another example, software filtering methods may also be utilized to filter out working signal values that are outside of the range of valid signal values. For example, the valid signal value range is set to fa to fb. Then, after receiving the operating signal value, it is determined whether the operating signal value is greater than or equal to fa. If the working signal value is less than fa, the working signal value is filtered. If the operating signal value is greater than or equal to fa, it is determined whether the operating signal value is less than or equal to fb. And if the working signal value is greater than fb, filtering the working signal value. If the operating signal value is less than or equal to fb, the operating signal value is passed.
The working signal value retained after filtering is involved in the process of obtaining the detection change threshold, so that the accuracy of the obtained detection change threshold corresponding to each probe can be further improved, and the accuracy of the detection result of each probe can be further improved.
Fig. 5 is a flowchart of a liquid level detection method according to another embodiment of the invention. Fig. 5 differs from fig. 3 in that step 104 in fig. 3 can be specifically subdivided into step 1041 and step 1042 in fig. 5.
Step 1041, calculating the average value of the working signal values of each adjusted probe within the range of effective signal values, respectively.
The average of the working signal values within the range of valid signal values that each probe retains after noise filtering in step 107 is calculated. The average value obtained in step 1041 is more accurate due to the removal of noise. Moreover, since the respective operation signal values are obtained at the respective operation points of each probe, the average value of the operation signal values at the plurality of operation points can reflect environmental factors and different individual differences, thereby taking the environmental factors and the different individual differences into account in the acquisition process of the detection variation threshold.
And 1042, taking the difference between the average value of the working signal values of each adjusted probe within the effective signal value range and the absolute variation as a detection variation threshold corresponding to each probe.
In yet another embodiment of the present invention, the working signal values of the respective working points of each probe may be periodically collected, and the optimized signal data of each probe may be obtained according to the collected working signal values. The optimized signal data is a signal value or a signal value interval. Changes in environmental factors surrounding the probe may cause changes in the operating signal value of the probe, and the changes in the operating signal value of the probe may last for a longer period of time.
if the general trend of the working signal values of the probes changes due to the change of environmental factors around the probes, in actual operation, there may still be some overlap of the working signal values of different probes, and there may still be some interference between different probes. In order to avoid the above situation, the optimized signal data of each probe can be obtained according to the working signal value of each probe at each working point. And then, according to the optimized signal data, the second signal data is optimized and adjusted, so that the interference between two or more probes used together is further avoided.
Fig. 6 is a schematic structural diagram of a liquid level detection apparatus 200 according to an embodiment of the present invention. As shown in fig. 6, the liquid level detection device 200 may include an acquisition module 201, an adjustment module 202, an acquisition module 203, a processing module 204, and a determination module 205.
an acquisition module 201 configured to acquire first signal data of each of the two or more probes used in combination.
An adjusting module 202 configured to adjust the second signal data of the two or more probes used in combination obtained by the first signal data so that an absolute value of a difference between the second signal data of the two or more probes used in combination is greater than a preset signal threshold.
In one example, the acquiring module 201 may be specifically configured to acquire the working signal value of each operation point of each probe; and obtaining first signal data of each probe according to the working signal value of each operating point of each probe, wherein the first signal data is a signal value or a signal value interval.
And the acquisition module 203 is configured to acquire the adjusted working signal value of each working point of each probe.
And the processing module 204 is configured to obtain a detection change threshold corresponding to each probe by using the adjusted working signal value and the adjusted absolute change amount of each working point of each probe, wherein the absolute change amount is the signal value change amount meeting the minimum detection dead volume.
And the determining module 205 is configured to determine whether each probe contacts the liquid level to be detected according to the adjusted working signal value of the current working point of each probe and the detection change threshold corresponding to each probe.
The acquisition module 201 may acquire the working signal value of each operation point of each probe in any one or more of the processes of descending, stopping or resetting. The obtaining module 201 may also collect the working signal value of each operation point of each probe within a preset time period.
The liquid level detection device 200 in the embodiment of the present invention introduces the adjusted operating signal values of each operating point of each probe into the calculation of the detection change threshold, thereby taking the multi-probe interference, the environmental factors, and the different individual differences into consideration in the liquid level detection judgment. The accuracy of the signal data or working signal value output by each probe is improved. And the accuracy of the detection result of the probe is improved.
In one example, the second signal data is a signal value or a signal value interval. And the second signal data does not overlap at all between two or more probes used.
in one example, the adjustment module 202 may be specifically configured to adjust the oscillation frequency parameters of the two or more probes used in combination, and obtain oscillation frequency data of the two or more probes used in combination.
wherein the second signal data includes oscillation frequency data.
Fig. 7 is a schematic structural diagram of a liquid level detecting device 200 according to another embodiment of the present invention. Fig. 7 is different from fig. 6 in that the liquid level detection apparatus 200 may further include a determination module 206 and a filtering module 207.
and a judging module 206 configured to judge whether the adjusted working signal value of each working point of each probe is within the effective signal value range.
And the difference value between the maximum value of the effective signal value range and the maximum signal value in the second signal data is less than or equal to a preset effective threshold value, and the difference value between the minimum value of the effective signal value range and the minimum signal value in the second signal data is less than or equal to a preset effective threshold value.
A filtering module 207 configured to filter out working signal values that are outside the range of valid signal values.
the processing module 204 in the above embodiments may be specifically configured to calculate an average value of the adjusted working signal values of each probe within the effective signal value range respectively; and taking the difference value between the average value and the absolute variation of the working signal value of each adjusted probe within the effective signal value range as a detection variation threshold corresponding to each probe.
In one example, the collected operating signal value is generally an analog signal such as a current or a voltage. The liquid level detection device 200 may further include an analog-to-digital conversion module. The analog-to-digital conversion module is configured to convert the acquired analog signals into digital signals for reading and storing.
Fig. 8 is a schematic structural diagram of a liquid level detection system according to an embodiment of the present invention. As shown in fig. 8, the liquid level detection system includes two or more probes 300 (only two probes 300 are labeled in fig. 8) in combination, and the liquid level detection apparatus 200 in the above embodiment. The liquid level detection device 200 is connected to the probe 300 so as to transmit an operation signal value or signal data output from the probe 300 to the liquid level detection device 200. The distributed capacitance C in fig. 8 represents the equivalent capacitance of the other parts in the level detection system.
The probe 300 is used to contact the surface of the liquid to be measured. The probe 300 may include, for example, a probe made of a metal material (e.g., a steel needle) or a probe made of a conductive non-metal material (e.g., a conductive plastic). For example, the probe 300 can be hollow (e.g., a pipette probe) or solid. In addition, although referred to as a "probe", the probe 300 may have any shape, for example, a needle-like shape, a rod-like shape, a block-like shape, a belt-like shape, a ring-like shape, or the like. The shape, size, etc. of the probe 300 may be set according to actual needs.
In one example, the fluid level detection system may further include a motion control mechanism that moves the probe down, off, or back. The motion control mechanism may include an actuator and a processing unit. The processing unit may be a separate microprocessor, microcontroller, Digital Signal Processor (DSP), Field Programmable Gate Array (FPGA), Application Specific Integrated Circuit (ASIC), or the like.
The fluid level sensing device 200 and the motion control mechanism may be communicatively coupled to each other. The liquid level detection device 200 determines whether the probe contacts the liquid level to be detected according to the signal data or the working signal value. Thereby sending instructions to the motion control mechanism, and controlling the probe to descend, stop or reset by the motion control mechanism.
The liquid level detection system in the embodiment of the invention can acquire more accurate signal data or working signal values from the signal processing device and can also acquire more accurate detection change threshold values, thereby improving the accuracy of liquid level detection.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For apparatus embodiments and system embodiments, reference may be made to the description of the method embodiments for relevant points. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions or change the order between the steps after appreciating the spirit of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
Claims (13)
1. A liquid level detection method, comprising:
Obtaining first signal data for each of the two or more probes used in combination;
Adjusting the first signal data to obtain second signal data of the two or more probes used in combination, so that the absolute value of the difference value between the second signal data of the two or more probes used in combination is larger than a preset signal threshold value or the second signal data of the two or more probes used in combination are not overlapped;
acquiring the adjusted working signal value of each operating point of each probe;
Obtaining a detection change threshold corresponding to each probe by using the adjusted working signal value and absolute change amount of each operating point of each probe, wherein the absolute change amount is a signal value change amount meeting the minimum detection dead volume;
And determining whether each probe contacts the liquid level to be detected according to the adjusted working signal value of the current working point of each probe and the detection change threshold corresponding to each probe.
2. The liquid level detection method according to claim 1, wherein the acquiring first signal data of each of the two or more probes used in combination comprises:
collecting working signal values of each operating point of each probe;
And obtaining the first signal data of each probe according to the working signal value of each operating point of each probe, wherein the first signal data is a signal value or a signal value interval.
3. The liquid level detection method according to claim 2, wherein the second signal data is a signal value or a signal value range;
The second signal data does not overlap at all between the two or more probes used in the combination.
4. The method for detecting a liquid level according to claim 1, further comprising, after acquiring the adjusted operation signal value of each operation point of each probe:
Judging whether the adjusted working signal value of each operating point of each probe is within an effective signal value range, wherein the difference between the maximum value of the effective signal value range and the maximum signal value in the second signal data is less than or equal to a preset effective threshold value, and the difference between the minimum value of the effective signal value range and the minimum signal value in the second signal data is less than or equal to the preset effective threshold value;
Filtering the working signal values that are outside the range of valid signal values.
5. The method for detecting a liquid level according to claim 4, wherein the obtaining of the detection change threshold corresponding to each probe by using the adjusted operation signal value and the adjusted absolute change amount of each operation point of each probe includes:
Respectively calculating the average value of the working signal values of each adjusted probe within the effective signal value range;
And taking the difference value between the average value and the absolute variation of the working signal value of each adjusted probe within the effective signal value range as a detection variation threshold corresponding to each probe.
6. The method of claim 1, wherein adjusting the first signal data to obtain second signal data for the two or more probes comprises:
Adjusting the oscillation frequency parameters of the two or more probes for combination to obtain oscillation frequency data of the two or more probes for combination, wherein the second signal data comprises the oscillation frequency data.
7. A liquid level detection apparatus, comprising:
an acquisition module configured to acquire first signal data of each of the two or more probes used in combination;
An adjustment module configured to adjust the first signal data to obtain second signal data of the two or more probes used in combination, so that an absolute value of a difference between the second signal data of the two or more probes used in combination is greater than a preset signal threshold or so that the second signal data of the two or more probes used in combination do not overlap;
the acquisition module is configured to acquire the adjusted working signal value of each working point of each probe;
A processing module configured to obtain a detection change threshold corresponding to each probe by using the adjusted working signal value and absolute change amount of each working point of each probe, wherein the absolute change amount is a signal value change amount meeting a minimum detection dead volume;
And the determining module is configured to determine whether each probe contacts the liquid level to be detected according to the adjusted working signal value of the current working point of each probe and the detection change threshold corresponding to each probe.
8. The fluid level detection device of claim 7, wherein the acquisition module is specifically configured to:
Collecting working signal values of each operating point of each probe;
And obtaining the first signal data of each probe according to the working signal value of each operating point of each probe, wherein the first signal data is a signal value or a signal value interval.
9. The fluid level sensing device of claim 8, wherein the second signal data is a signal value or a signal value interval;
The second signal data does not overlap at all between the two or more probes used in the combination.
10. The liquid level detection device as claimed in claim 7, further comprising:
a determining module configured to determine whether the adjusted working signal value of each working point of each probe is within a valid signal value range, a difference between a maximum value of the valid signal value range and a maximum signal value in the second signal data is less than or equal to a preset valid threshold, and a difference between a minimum value of the valid signal value range and a minimum signal value in the second signal data is less than or equal to the preset valid threshold;
A filtering module configured to filter out the working signal values that are outside the range of valid signal values.
11. The fluid level detection device of claim 10, wherein the processing module is specifically configured to:
respectively calculating the average value of the working signal values of each adjusted probe within the effective signal value range;
And taking the difference value between the average value and the absolute variation of the working signal value of each adjusted probe within the effective signal value range as a detection variation threshold corresponding to each probe.
12. the fluid level detection device of claim 7, wherein the adjustment module is specifically configured to:
Adjusting the oscillation frequency parameters of the two or more probes for combination to obtain oscillation frequency data of the two or more probes for combination, wherein the second signal data comprises the oscillation frequency data.
13. A liquid level detection system comprising two or more probes in combination, and a liquid level detection device as claimed in any one of claims 7 to 12.
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| CN107505024B (en) * | 2017-07-31 | 2019-07-09 | 迈克医疗电子有限公司 | Detecting liquid level methods, devices and systems |
| CN107677843A (en) * | 2017-09-26 | 2018-02-09 | 迈克医疗电子有限公司 | Reagent container locking device |
| CN110806243B (en) * | 2019-10-10 | 2021-04-27 | 广州市威控机器人有限公司 | Liquid level detection method, liquid level detection equipment and computer readable storage medium |
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