CN111166358A - Pressure zero point correction method, device, equipment and computer readable storage medium - Google Patents
Pressure zero point correction method, device, equipment and computer readable storage medium Download PDFInfo
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- CN111166358A CN111166358A CN201811343763.0A CN201811343763A CN111166358A CN 111166358 A CN111166358 A CN 111166358A CN 201811343763 A CN201811343763 A CN 201811343763A CN 111166358 A CN111166358 A CN 111166358A
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- A61B5/22—Ergometry; Measuring muscular strength or the force of a muscular blow
- A61B5/224—Measuring muscular strength
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- A—HUMAN NECESSITIES
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- A61B5/4306—Detecting, measuring or recording for evaluating the reproductive systems for evaluating the female reproductive systems, e.g. gynaecological evaluations
- A61B5/4318—Evaluation of the lower reproductive system
- A61B5/4325—Evaluation of the lower reproductive system of the uterine cavities, e.g. uterus, fallopian tubes, ovaries
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Abstract
The embodiment of the invention is suitable for the technical field of uterine contraction pressure probes, and provides a pressure zero point correction method, a device, equipment and a computer readable storage medium.
Description
Technical Field
The invention belongs to the technical field of uterine contraction pressure probes, and particularly relates to a pressure zero point correction method, a device, equipment and a computer readable storage medium.
Background
The uterine contraction pressure probe generally uses a full-bridge type strain resistance circuit (or called strain gauge) to measure uterine contraction pressure, and the full-bridge type strain resistance circuit has the characteristics of large measuring range, high precision and good linearity, and is very widely applied.
However, the strain gauge is generally mounted on a plastic housing, and the zero point of the strain gauge is shifted due to the release of mechanical stress of the plastic housing or deformation of the plastic housing with time.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a method, an apparatus, a device, and a computer-readable storage medium for zero-point calibration of a pressure, so as to solve the problem that the zero point of the existing strain gauge is shifted due to the release of mechanical stress of a plastic housing or deformation of the plastic housing with time when the existing strain gauge is mounted on the plastic housing.
A first aspect of an embodiment of the present invention provides a pressure zero point correction method, where the method includes:
acquiring a zero offset value of the strain gauge;
judging whether the zero offset value is within a zero balance value range;
when the zero offset value is not in the zero balance value range, determining a calibration interval in which the zero offset value falls;
adjusting the zero point adjusting circuit to a gear position value corresponding to the calibration interval, and returning to the step of acquiring a zero point offset value of the strain gauge;
when the zero offset value is within the zero balance value range, the correction is ended.
A second aspect of an embodiment of the present invention provides a pressure zero point correction apparatus, including:
the offset value acquisition module is used for acquiring a zero offset value of the strain gauge;
the judging module is used for judging whether the zero offset value is within the zero balance value range;
the determining module is used for determining a calibration interval in which the zero offset value falls when the zero offset value is not in the zero balance value range;
the adjusting module is used for adjusting the zero point adjusting circuit to a gear position value corresponding to the calibration interval and returning to the step of acquiring a zero point offset value of the strain gauge;
and the ending module is used for ending the correction when the zero offset value is within the zero balance value range.
A third aspect of embodiments of the present invention provides an apparatus comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method when executing the computer program.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the above-described method.
According to the embodiment of the invention, the zero offset value of the strain gauge is obtained, the calibration interval to which the zero offset value belongs is determined when the zero offset value is not in the zero balance value range, the zero adjusting circuit is adjusted to the gear position value corresponding to the calibration interval to which the zero offset value belongs, and the calibration is finished until the zero offset value is in the zero balance value range, so that the automatic calibration of the zero offset value corresponding to the strain gauge can be realized, and the calibration efficiency and the calibration precision are high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a pressure zero calibration method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a pressure zero point calibration method according to a second embodiment of the present invention;
fig. 3 is a schematic flow chart of a pressure zero point calibration method according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a pressure zero point correction device according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a pressure zero point correction device according to a fifth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a pressure zero point correction device according to a sixth embodiment of the present invention;
fig. 7 is a schematic structural diagram of a uterine contraction pressure probe provided by the seventh embodiment of the invention;
fig. 8 is a schematic structural diagram of an apparatus according to an eighth embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Example one
The embodiment provides a pressure zero point correction method which is realized based on a uterine contraction pressure probe, wherein the uterine contraction pressure probe comprises a strain gauge and a zero point adjusting circuit, the zero point adjusting circuit is connected with the strain gauge and is used for adjusting the electric potential of the strain gauge, and the zero point adjusting circuit comprises a plurality of electric potential adjusting gears.
In a specific application, the zero point adjusting circuit can be a potential adjusting circuit comprising a digital potentiometer and a resistor, and can also be a potential adjusting circuit comprising an electronic switch, a digital decoder and a resistor.
The method provided by the embodiment can be applied to any equipment with data processing and man-machine interaction functions, such as a fetal monitor and an upper Computer, and also can be a mobile phone, a tablet Computer, a Personal digital assistant, a Personal Computer (PC) client connected with a display, and the like.
As shown in fig. 1, the pressure zero point correction method provided in this embodiment includes:
in step S101, the zero offset value of the strain gauge is acquired.
In a specific application, the equipment obtains the zero offset value of the strain gauge by acquiring the zero offset signal of the strain gauge and filtering, amplifying and performing analog-to-digital conversion.
In one embodiment, before step S101, the method includes:
step S100, when a pressure zero point correction instruction is received, controlling a uterine compression probe to enter a zero point correction state; wherein the zero point correction state is a state in which the uterine contraction pressure probe receives only a control command for performing pressure zero point correction.
In specific application, when a user needs to perform zero point correction of the uterine compression probe, the user can enter a zero point correction interface of the equipment for executing the method in any human-computer interaction mode, and then inputs a pressure zero point correction instruction to trigger the equipment to start a zero point correction program.
In one embodiment, step S100 is preceded by:
when a correction interface display instruction input by a user is received, displaying a correction interface;
correspondingly, step S100 includes:
and when a pressure zero point correction instruction input by a user through the correction interface is received, a zero point correction state instruction is sent to the uterine contraction pressure probe so as to control the uterine contraction pressure probe to enter a zero point correction state.
In a specific application, the format of the null point correction state instruction may be a frame header + an instruction content field + a frame trailer. And when the uterine compression probe enters a zero correction state, responding to the equipment and sending the state information and the test value of the uterine compression probe to the equipment, and displaying the received state signal and the test value by the equipment. When the equipment receives a response signal sent by the uterine compression probe, an exclusive channel used for transmitting a state signal and a test value and arranged between the equipment and the uterine compression probe is established, and the uterine compression probe can only receive a control instruction for carrying out pressure zero point correction and is not interfered by other instructions until the correction is finished. The accuracy of the correction process can be ensured, and misoperation is avoided.
In one embodiment, step S101 includes:
when the uterine contraction pressure probe is in a zero pressure state, acquiring a zero offset value of the strain gauge; wherein the zero pressure state is a state that the strain gauge does not bear external force and the pressure value of the uterine contraction pressure probe is stable.
In the specific application, after the uterine contraction pressure probe enters a zero-point correction state, the equipment displays and guides a user to enable the uterine contraction pressure probe to be in a zero-pressure state, namely the user is guided to enable a pressure sensing surface of a strain gauge of the uterine contraction pressure probe to be suspended, and the uterine contraction pressure probe is horizontally placed, so that the strain gauge does not bear external force. After the user operation is finished, a zero pressure state determining instruction can be sent to the equipment in any man-machine interaction mode, so that the equipment can know that the uterine contraction pressure probe is in a zero pressure state.
In one embodiment, step S101 includes:
step S1011, continuously obtaining a plurality of pressure values of the uterine contraction pressure probe and drawing a curve of the plurality of pressure values along with time change;
in step S1012, when the change rate of the curve is within the preset change rate range, the zero point offset value of the strain gauge is acquired.
In one embodiment, step S1011 includes:
when the uterine contraction pressure probe enters a zero pressure state, continuously acquiring a plurality of pressure values of the uterine contraction pressure probe;
and drawing a curve of the pressure values along with the change of time according to the pressure values.
In specific application, the number of the obtained pressure values can be set according to actual needs, the equipment can draw a relation point between the pressure value and time every time when obtaining one pressure value, then continuously obtain the relation points between the pressure values and the time to form a curve, when the change rate of the curve is within a preset change rate range, the pressure value obtaining and the curve drawing can be stopped, the pressure value of the uterine compression pressure probe is considered to be stable, and at the moment, the accurate zero offset value can be obtained.
In a specific application, the change rate of the curve of the pressure values with time is the change amount of the pressure values in a unit time, i.e. the ratio of the change amount of the pressure values in a certain period of time to the time length, for example, the time length of a certain period of time is a, the pressure value at the starting time of the period of time is B, the pressure value at the ending time of the period of time is C, and the change rate of the curve of the pressure values with time in the period of time is (C-B)/a.
In a specific application, theoretically, the change rate of the curve of the pressure value along with the change of time should be equal to 0 to consider that the pressure value is not changed, and the uterine contraction pressure probe is absolutely stable. Due to the influence of objective natural environment and equipment measurement precision, certain errors are allowed to exist, and when the change rate of the curve is within a preset change rate range, the uterine compression probe is considered to be stable. The preset range of the change rate can be set according to actual needs, for example, -1% to 1%.
In a specific application, whether the uterine contraction pressure probe is stable or not can be judged by comparing pressure difference values between pressure values acquired at adjacent moments, for example, when a plurality of continuous pressure difference values are within a preset pressure difference value range, the uterine contraction pressure probe is considered to be stable.
And step S102, judging whether the zero offset value is in the zero balance value range.
In a specific application, when the strain gauge is at the equilibrium position, the zero point offset value should theoretically be 0, but since a certain error is allowed, when the zero point offset value of the strain gauge is within a certain range of values around 0, it is considered to be at the equilibrium position, that is, when the zero point offset value is within the zero point equilibrium value range, it is considered to be at the equilibrium position. The zero balance value range can be specifically set according to actual needs.
Step S103, when the zero offset value is not in the zero balance value range, determining a calibration interval to which the zero offset value belongs.
In a specific application, the calibration intervals corresponding to the zero point adjusting circuit are calibration intervals accurately corresponding to each gear of the zero point adjusting circuit obtained through calibration measurement. When the zero point adjustment circuit is a potential adjustment circuit including a digital potentiometer and a resistor, the shift position refers to a shift position corresponding to each shift position value of the digital potentiometer of the zero point adjustment circuit.
In a specific application, the calibration measurement is as follows: the method comprises the steps of obtaining zero offset values of strain gauges in advance, adjusting gears of a digital potentiometer according to the zero offset values of the strain gauges, recording gear values, enabling the zero offset values to be within a zero balance value range, counting a large number of zero offset values, gears corresponding to the zero offset values and recording the gear values according to the mode, finally obtaining a plurality of zero offset values corresponding to each gear and the gear value of the gear, enabling a numerical range to which the zero offset values corresponding to the gear and the gear value of the gear belong to serve as a calibration interval, and establishing corresponding relations between the gear and the gear value of the gear and the corresponding calibration interval. For example, assuming that the zero offset values corresponding to a certain shift position are 0, 1, 2, … …, and n, respectively, the calibration interval corresponding to the shift position is [0, n ].
In a specific application, when a zero-point offset value falls within a numerical range of a certain calibration interval, the zero-point offset value is considered to belong to the calibration interval.
In one embodiment, step S103 includes:
and step S1031, when the zero offset value is not within the zero balance value range, sorting the zero offset value and a plurality of calibration intervals corresponding to the zero adjustment circuit, and determining a calibration interval in which the zero offset value falls.
In one embodiment, step S1031 includes:
when the zero offset value is not in the zero balance value range, sequencing the zero offset value and a plurality of calibration intervals corresponding to the zero adjusting circuit;
and determining the calibration interval to which the zero offset value belongs according to the calibration interval to which the zero offset value falls.
In a specific application, the step of sequencing the zero offset value and the plurality of calibration intervals corresponding to the zero adjustment circuit means: and sequencing the zero offset value and the numerical values in the plurality of calibration intervals corresponding to the zero adjusting circuit from small to large or from large to small. When the zero offset value falls within the numerical range of a certain calibration interval, the zero offset value is considered to belong to the calibration interval.
Step S104 is to adjust the zero point adjustment circuit to the range value corresponding to the calibration interval, and the process returns to step S101.
In a specific application, after the calibration interval to which the zero offset value belongs is determined, the gear and the gear value corresponding to the calibration interval to which the zero offset value belongs may be determined according to a correspondence relationship between each gear and the gear value thereof and the corresponding calibration interval, which is established in advance.
In one embodiment, step S104 includes:
step S1041 of adjusting the zero point adjustment circuit to a gear corresponding to the calibration interval to which the zero point offset value belongs, recording a gear value of the gear, and returning to step S101.
In specific application, after the gear is determined, the gear value corresponding to the gear is recorded, so that when the uterine contraction pressure probe is powered on and started next time, the corresponding gear value is directly read, and the zero point adjusting circuit is directly adjusted to the corresponding gear. If the gear position value is 0, it indicates that the strain gauges are in the equilibrium position.
In a specific application, in order to obtain an accurate correction result, after one correction, it is necessary to return to step S101 again and repeatedly perform the zero point correction process until the zero point offset value is within the zero point balance value range.
And step S105, finishing the correction when the zero offset value is in the zero balance value range.
In a specific application, if the zero-point offset value obtained for the first time is within the zero-point balance value range, the calibration may be directly ended, or in order to obtain a more accurate calibration result, when the zero-point offset value is within the zero-point balance value range, the procedure returns to step S101, and it is repeatedly verified whether the zero-point offset value is within the zero-point balance value range until the zero-point offset value is within the zero-point balance value range for multiple times.
In the embodiment, the zero offset value of the strain gauge is obtained, the calibration interval to which the zero offset value belongs is determined when the zero offset value is not within the zero balance value range, the zero adjustment circuit is adjusted to the gear position value corresponding to the calibration interval to which the zero offset value belongs, and the calibration is finished until the zero offset value is within the zero balance value range, so that the automatic calibration of the zero offset value corresponding to the strain gauge can be realized, and the calibration efficiency and the calibration accuracy are high.
Example two
As shown in fig. 2, in the present embodiment, the step S101 in the first embodiment includes:
in step S201, a zero point offset signal of the strain gauge is acquired.
In a particular application, the zero offset signal includes a positive voltage signal on the positive sensor signal terminal of the strain gauge and a negative voltage signal on the negative sensor signal terminal.
In one embodiment, step S201 includes:
step S2011, when the uterine contraction pressure probe is in a zero pressure state, acquiring a zero offset signal of the strain gauge.
Step S202, common mode voltage signals of the zero offset signals are counteracted, differential mode voltage signals of the zero offset signals are amplified, filtering and analog-to-digital conversion are carried out, and zero offset values of the strain gauges are obtained.
In one embodiment, step S202 includes:
step S2021, canceling the common mode voltage signal of the zero offset signal, and amplifying the differential mode voltage signal of the zero offset signal.
In a specific application, the differential mode voltage signal can be counteracted and amplified by controlling a differential amplifying circuit connected with the strain gauge.
Step S2022, filtering the differential mode voltage signal to filter an abnormal signal in the differential mode voltage signal.
In a specific application, according to the practical application scenario of the strain gauge, the sensor signal generated by the strain gauge is usually a low-frequency signal with a frequency of 1Hz or less, and the zero offset signal is a direct-current signal, so that a low-pass filter needs to be added after the differential amplifier circuit to filter an abnormal signal generated by the jitter of the uterine contraction pressure probe or the misoperation action of a user in the differential mode voltage signal. The low-pass filter may be a filter formed by one or more stages of filter circuits.
Step S2023, performing analog-to-digital conversion on the filtered differential mode voltage signal to obtain a differential mode voltage digital signal.
In a specific application, analog-to-digital conversion to digital signals is required because the analog signals cannot be directly recognized by the processor of the device when the differential mode voltage signals are filtered. In particular, this can be achieved by providing an analog-to-digital converter after the differential amplifier circuit.
In a specific Application, the Processor may be a Central Processing Unit (CPU), a Micro Control Unit (MCU)), or other general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA), or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Step S2024, obtaining a zero offset value of the strain gauge according to the differential mode voltage digital signal.
In specific application, the processor identifies and calculates the differential mode voltage digital signal to obtain a zero offset value of the strain gauge, wherein the zero offset value of the strain gauge is a voltage difference value between the positive sensor signal and the negative sensor signal when the strain gauge does not bear external force.
EXAMPLE III
As shown in fig. 3, in addition to the first or second embodiment, the pressure zero point correction method further includes:
step S301, when a full-scale selection instruction is received, controlling the uterine contraction pressure probe to enter a full-scale state, and acquiring and displaying a pressure value of the uterine contraction pressure probe.
In one embodiment, step S301 comprises:
step S3011, when receiving the full-scale selection instruction, controlling the uterine contraction pressure probe to enter the full-scale state; and the full-scale state is a state that the strain gauge bears the full-scale external force and the pressure value of the uterine contraction pressure probe is stable.
In specific application, a correction interface of the device can display a pressurization correction selection area, a user can select a range to be corrected in the pressurization correction selection area according to actual needs, and the user can also directly input the range to be corrected in a range input area of the pressurization correction selection area so as to perform full-range pressurization correction on the uterine contraction pressure probe.
And step S3012, when the uterine contraction pressure probe is in a full-scale state, acquiring and displaying a pressure value of the uterine contraction pressure probe.
In the specific application, after the uterine contraction pressure probe enters the full-scale state, the device acquires and displays the pressure value of the uterine contraction pressure probe in real time, and after the user judges that the pressure value of the uterine contraction pressure probe is stable according to the displayed pressure value, a full-scale pressurization correction instruction can be input into a correction page of the device through any man-machine interaction mode, so that the device returns to the step of acquiring the zero offset value of the strain gauge.
And step S302, when a full-scale pressurization correction command is received, returning to the step of acquiring the zero offset value of the strain gauge until the pressure value of the uterine contraction pressure probe is within the full-scale range.
In a specific application, when a full-scale pressurization correction command is received, the process proceeds to the step of acquiring the zero offset value of the strain gauge in step S101, and the step of correcting the zero offset value is performed again, so as to reduce the influence of the zero offset value correction process in the first embodiment or the second embodiment on the measurement range of the uterine contraction pressure probe, and to make the uterine contraction pressure measurement range after the zero offset value correction is performed within the normal range.
In a specific application, when the uterine contraction pressure probe is in a full-scale state, the pressure value of the uterine contraction pressure probe should be equal to the full-scale state under an ideal state. Because some error is allowed, it can be considered that the pressure value of the uterine contraction pressure probe is qualified when the pressure value is within the full scale range after the full scale pressurization correction is performed. The full-scale range can be set to be within a certain tolerance range from the positive deviation and the negative deviation of the full-scale range according to actual needs.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Example four
The embodiment provides a pressure zero point correction device, which is connected with a uterine contraction pressure probe, wherein the uterine contraction pressure probe comprises a strain gauge and a zero point adjusting circuit, the zero point adjusting circuit is connected with the strain gauge and is used for adjusting the electric potential of the strain gauge so as to adjust the zero point deviation value of the strain gauge, and the zero point adjusting circuit comprises a plurality of electric potential adjusting gears.
In this embodiment, the pressure zero point calibration device may be any device or software program device in the device having data processing and human-Computer interaction functions, and the device may be a fetal monitor, a host Computer, a mobile phone, a tablet Computer, a Personal digital assistant, a PC (Personal Computer) client connected with a display, and the like.
As shown in fig. 4, the pressure zero point correction apparatus 4 provided in this embodiment is used for executing the method steps in the first embodiment, and the apparatus includes:
an offset value obtaining module 401, configured to obtain a zero offset value of the strain gauge;
a determining module 402, configured to determine whether the zero offset value is within a zero balance value range;
a determining module 403, configured to determine a calibration interval in which the zero offset value falls when the zero offset value is not within the zero balance value range;
an adjusting module 404, configured to adjust the zero point adjusting circuit to a gear position value corresponding to the calibration interval, and return to the step of obtaining a zero point offset value of the strain gauge;
an ending module 405, configured to end the correction when the zero offset value is within the zero balance value range.
In one embodiment, the pressure zero point correction device 4 further includes:
the state control module is used for controlling the uterine compression probe to enter a zero correction state when receiving a pressure zero correction instruction; wherein the zero point correction state is a state in which the uterine contraction pressure probe receives only a control command for performing pressure zero point correction.
In one embodiment, the pressure zero point correction device 4 further includes:
the display module is used for displaying the correction interface when receiving a correction interface display instruction input by a user;
correspondingly, the state control module is specifically configured to:
and when a pressure zero point correction instruction input by a user through the correction interface is received, a zero point correction state instruction is sent to the uterine contraction pressure probe so as to control the uterine contraction pressure probe to enter a zero point correction state.
In an embodiment, the offset value obtaining module 401 is specifically configured to:
when the uterine contraction pressure probe is in a zero pressure state, acquiring a zero offset value of the strain gauge; wherein the zero pressure state is a state that the strain gauge does not bear external force and the pressure value of the uterine contraction pressure probe is stable.
In one embodiment, the offset value obtaining module 401 includes:
the curve generation unit is used for continuously acquiring a plurality of pressure values of the uterine contraction pressure probe and drawing a curve of the pressure values along with time change;
and the acquisition unit is used for acquiring the zero offset value of the strain gauge when the change rate of the curve is within a preset change rate range.
In an embodiment, the determining module 403 is specifically configured to:
and when the zero offset value is not in the zero balance value range, sequencing the zero offset value and a plurality of calibration intervals corresponding to the zero adjusting circuit, and determining the calibration interval in which the zero offset value falls.
In one embodiment, the determining module 403 includes:
a sorting unit configured to sort the zero offset value and a plurality of calibration intervals corresponding to the zero point adjustment circuit when the zero offset value is not within the zero point balance value range;
and the determining unit is used for determining the calibration interval to which the zero offset value belongs according to the calibration interval in which the zero offset value falls.
In the embodiment, the zero offset value of the strain gauge is obtained, the calibration interval to which the zero offset value belongs is determined when the zero offset value is not within the zero balance value range, the zero adjustment circuit is adjusted to the gear position value corresponding to the calibration interval to which the zero offset value belongs, and the calibration is finished until the zero offset value is within the zero balance value range, so that the automatic calibration of the zero offset value corresponding to the strain gauge can be realized, and the calibration efficiency and the calibration accuracy are high.
EXAMPLE five
As shown in fig. 5, in the present embodiment, the offset value obtaining module 401 in the fourth embodiment includes a structure for executing the method steps in the second embodiment, and includes:
a signal acquiring unit 501, configured to acquire a zero offset signal of the strain gauge;
the offset value obtaining unit 502 cancels the common mode voltage signal of the zero offset signal, amplifies the differential mode voltage signal of the zero offset signal, and performs filtering and analog-to-digital conversion to obtain the zero offset value of the strain gauge.
In an embodiment, the signal obtaining unit 501 is specifically configured to:
and when the uterine contraction pressure probe is in a zero pressure state, acquiring a zero offset signal of the strain gauge.
In one embodiment, the offset value obtaining unit 502 includes:
the offset amplification subunit is used for offsetting the common-mode voltage signal of the zero offset signal and amplifying the differential-mode voltage signal of the zero offset signal;
the filtering subunit is used for filtering the differential mode voltage signal so as to filter abnormal signals in the differential mode voltage signal;
the analog-to-digital conversion subunit is used for performing analog-to-digital conversion on the filtered differential mode voltage signal to obtain a differential mode voltage digital signal;
and the offset value acquisition subunit is used for acquiring the zero offset value of the strain gauge according to the differential mode voltage digital signal.
EXAMPLE six
As shown in fig. 6, in the present embodiment, the pressure zero-point correcting device 4 in the fourth embodiment or the fifth embodiment further includes a structure for executing the method steps in the third embodiment.
The pressure zero point correction device 4 further includes:
the state control module 601 is used for controlling the uterine contraction pressure probe to enter a full-scale state when a full-scale selection instruction is received, and acquiring and displaying a pressure value of the uterine contraction pressure probe;
the returning module 602 is configured to, when a full-scale pressurization correction instruction is received, return to the step of obtaining the zero offset value of the strain gauge until the pressure value of the uterine contraction pressure probe is within the full-scale range.
EXAMPLE seven
As shown in fig. 7, the present embodiment provides a uterine contraction pressure probe, which includes a strain gauge 10 and a zero point adjusting circuit 20, wherein the zero point adjusting circuit 20 includes a current limiting resistor R0, N voltage dividing resistors R1-RN, and N +1 potential switches SW 1-SW (N + 1).
The positive sensor signal end S + and the negative sensor signal end S-of the strain gauge 10 are connected to the pressure zero point correction device in the fourth, fifth or sixth embodiment;
one end of a current-limiting resistor R0 is connected with a negative sensor signal end S of the strain gauge 10, the other end of the current-limiting resistor R0 is connected with the input ends of N +1 potential switches SW 1-SW (N +1) in a common mode, the output end of the 1 st potential switch SW1 is connected with one end of the 1 st voltage-dividing resistor R1 and the positive power end V + of the strain gauge 10 in a common mode, the output end of the i +1 st potential switch SW (i +1) is connected with the other end of the i th voltage-dividing resistor Ri and one end of the i +1 st voltage-dividing resistor R (i +1) in a common mode, the output end of the N +1 st potential switch SW (N +1) is connected with the other end of the N th voltage-dividing resistor RN and the negative power end V-zero point of the strain gauge 10 in a common mode, and the controlled end of the N +1 st potential switch SW (N;
wherein N is more than or equal to 1, N is more than i and is more than or equal to 1, and both N and i are integers.
Fig. 7 schematically shows a structural diagram of the uterine compression probe 20 when N is 4.
In a specific application, the potential switch may be an electronic switch formed by a triode, a field effect transistor, and the like, and fig. 7 only shows an exemplary logical connection relationship between the potential switch and other devices, and is not used to represent an actual form of the potential switch.
In specific application, the resistance values of the current limiting resistor R0 and the N voltage dividing resistors R1-RN can be set according to actual needs, and the resistance values of the N voltage dividing resistors R1-RN can be set to be equal.
Example eight
As shown in fig. 8, the present embodiment provides an apparatus 8, which includes: a processor 80, a memory 81 and a computer program 82, such as a pressure zero correction program, stored in said memory 81 and executable on said processor 80. The processor 80, when executing the computer program 82, implements the steps in the various pressure zero point correction method embodiments described above, such as steps S101 to S105 shown in fig. 1. Alternatively, the processor 80, when executing the computer program 82, implements the functions of the modules/units in the above-described device embodiments, such as the functions of the modules 401 to 405 shown in fig. 4.
Illustratively, the computer program 82 may be partitioned into one or more modules/units that are stored in the memory 81 and executed by the processor 80 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 82 in the device 8. For example, the computer program 82 may be divided into an offset value obtaining module, a judging module, a determining module, an adjusting module, and an ending module, and the specific functions of each module are as follows:
the offset value acquisition module is used for acquiring a zero offset value of the strain gauge;
the judging module is used for judging whether the zero offset value is within the zero balance value range;
the determining module is used for determining a calibration interval in which the zero offset value falls when the zero offset value is not in the zero balance value range;
the adjusting module is used for adjusting the zero point adjusting circuit to a gear position value corresponding to the calibration interval and returning to the step of acquiring a zero point offset value of the strain gauge;
and the ending module is used for ending the correction when the zero offset value is within the zero balance value range.
The device 8 may be a medical device such as a fetal monitor, a uterine contraction pressure probe, or a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The apparatus may include, but is not limited to, a processor 80, a memory 81. Those skilled in the art will appreciate that fig. 8 is merely an example of a device 8 and does not constitute a limitation of device 8 and may include more or fewer components than shown, or some components in combination, or different components, e.g., the device may also include input output devices, network access devices, buses, etc.
The Processor 80 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 81 may be an internal storage unit of the device 8, such as a hard disk or a memory of the device 8. The memory 81 may also be an external storage device of the device 8, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, provided on the device 8. Further, the memory 81 may also include both an internal storage unit of the device 8 and an external storage device. The memory 81 is used for storing the computer program and other programs and data required by the apparatus. The memory 81 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/device and method can be implemented in other ways. For example, the above-described apparatus/device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A pressure zero correction method, characterized in that the method comprises:
acquiring a zero offset value of the strain gauge;
judging whether the zero offset value is within a zero balance value range;
when the zero offset value is not in the zero balance value range, determining a calibration interval in which the zero offset value falls;
adjusting the zero point adjusting circuit to a gear position value corresponding to the calibration interval, and returning to the step of acquiring a zero point offset value of the strain gauge;
when the zero offset value is within the zero balance value range, the correction is ended.
2. The pressure zero-point correction method according to claim 1, wherein acquiring the zero-point offset value of the strain gauge includes:
acquiring a zero offset signal of the strain gauge;
and offsetting the common-mode voltage signal of the zero offset signal, amplifying the differential-mode voltage signal of the zero offset signal, and performing filtering and analog-to-digital conversion to obtain the zero offset value of the strain gauge.
3. The pressure zero-point correction method according to claim 1, wherein determining a calibration interval within which the zero-point offset value falls when the zero-point offset value is not within the zero-point balance value range includes:
and when the zero offset value is not in the zero balance value range, sequencing the zero offset value and a plurality of calibration intervals corresponding to the zero adjusting circuit, and determining the calibration interval in which the zero offset value falls.
4. The pressure zero-point correction method according to claim 1, wherein obtaining the zero-point offset value of the strain gauge includes:
and when a pressure zero point correction instruction is received, controlling the uterine contraction pressure probe to enter a zero point correction state.
5. The pressure zero point correction method according to claim 4, wherein, when receiving the pressure zero point correction command, before controlling the uterine compression probe to enter the zero point correction state, the method comprises:
when a correction interface display instruction is received, displaying a correction interface;
correspondingly, when a pressure zero point correction instruction is received, the uterine compression probe is controlled to enter a zero point correction state, and the method comprises the following steps:
and when a pressure zero point correction instruction input through the correction interface is received, sending a zero point correction state instruction to the uterine contraction pressure probe so as to control the uterine contraction pressure probe to enter a zero point correction state.
6. The pressure zero-point correction method according to claim 1, wherein acquiring the zero-point offset value of the strain gauge includes:
continuously acquiring a plurality of pressure values of the uterine contraction pressure probe and drawing a curve of the pressure values along with the change of time;
and when the change rate of the curve is within a preset change rate range, acquiring the zero offset value of the strain gauge.
7. The pressure zero correction method according to any one of claims 1 to 6, characterized in that the method further comprises:
when a full-scale selection instruction is received, controlling the uterine contraction pressure probe to enter a full-scale state, and acquiring and displaying a pressure value of the uterine contraction pressure probe;
and when a full-scale pressurization correction instruction is received, returning to the step of acquiring the zero offset value of the strain gauge until the pressure value of the uterine contraction pressure probe is within the full-scale range.
8. A pressure zero point correction apparatus, characterized in that the apparatus comprises:
the offset value acquisition module is used for acquiring a zero offset value of the strain gauge;
the judging module is used for judging whether the zero offset value is within the zero balance value range;
the determining module is used for determining a calibration interval in which the zero offset value falls when the zero offset value is not in the zero balance value range;
the adjusting module is used for adjusting the zero point adjusting circuit to a gear position value corresponding to the calibration interval and returning to the step of acquiring a zero point offset value of the strain gauge;
and the ending module is used for ending the correction when the zero offset value is within the zero balance value range.
9. An apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the steps of the method according to claims 1-7 are implemented when the computer program is executed by the processor.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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| CN115474902A (en) * | 2022-09-30 | 2022-12-16 | 山东大学 | Human body pressure threshold detection device and detection method |
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