CN117537849A - Digital collision sensor based on quartz crystal - Google Patents
Digital collision sensor based on quartz crystal Download PDFInfo
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- CN117537849A CN117537849A CN202311517419.XA CN202311517419A CN117537849A CN 117537849 A CN117537849 A CN 117537849A CN 202311517419 A CN202311517419 A CN 202311517419A CN 117537849 A CN117537849 A CN 117537849A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
Abstract
The invention provides a digital collision sensor based on quartz crystal, comprising: a quartz tuning fork, which is a sensitive element of the digital collision sensor; the charge pickup amplifying module is used for picking and amplifying two paths of charge signals conducted by the interdigital electrodes of the quartz tuning fork to obtain two paths of voltage signals; the signal acquisition module is used for carrying out differential acquisition on the two paths of voltage signals to obtain differential voltage signals; the data processing module is used for converting the differential voltage signals into digital quantities and performing data processing to obtain target data, wherein the target data comprises one or more of voltage data, impact acceleration data, voltage peaks and impact acceleration peaks; and the signal output control module is used for outputting digital signals and/or analog signals based on the target data.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a digital collision sensor based on quartz crystals.
Background
Collision sensors are widely used in automotive airbag ejection systems as control signal input devices. The system has the function that when the automobile collides, the collision sensor detects the intensity signal of the automobile collision and inputs the signal into the computer, and the computer judges whether to detonate the inflation element to inflate the air bag according to the collision signal.
The collision sensor on the market at present is an electromechanical combination type collision sensor, a resistance strain gauge type collision sensor, a collision sensor based on a piezoelectric ceramic plate and the like, wherein the electromechanical combination type collision sensor is made of a nonmagnetic material, a rolling ball is made of a magnetic conductive material, the ball cannot be used continuously after an airbag is detonated, the cost is high, the sensitive axial direction of the sensor is required to be fixed in installation position and installation angle, the application is not simple and convenient enough, and the sensor is large in size and cannot be miniaturized. The resistance strain gauge type collision sensor is greatly affected by temperature, and when the sensor is applied, the temperature change can cause obvious change of resistance, so that the measurement accuracy is reduced. The collision sensor based on the piezoelectric ceramic plate has high cost and complex internal structure, and cannot meet the complex use environment.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a digital collision sensor based on quartz crystals.
In a first aspect, the present invention provides a quartz crystal based digital impact sensor comprising:
a quartz tuning fork, which is a sensitive element of the digital collision sensor;
the charge pickup amplifying module is used for picking and amplifying two paths of charge signals conducted by the interdigital electrodes of the quartz tuning fork to obtain two paths of voltage signals;
the signal acquisition module is used for carrying out differential acquisition on the two paths of voltage signals to obtain differential voltage signals;
the data processing module is used for converting the differential voltage signals into digital quantities and performing data processing to obtain target data, wherein the target data comprises one or more of voltage data, impact acceleration data, voltage peaks and impact acceleration peaks;
and the signal output control module is used for outputting digital signals and/or analog signals based on the target data.
In some embodiments, the signal output control module is specifically configured to:
outputting the voltage data and/or the jerk data in a digital signal output mode;
in the analog signal output mode, a corresponding level signal is output based on a comparison result of the voltage peak value or the jerk peak value with a corresponding threshold value.
In some embodiments, the outputting a respective level signal based on a comparison of the voltage peak or the jerk peak with a respective threshold value comprises:
if the absolute value of the voltage peak value or the absolute value of the impact acceleration peak value is larger than the corresponding threshold value, outputting a high-level signal;
and outputting a low-level signal if the absolute value of the voltage peak value or the absolute value of the impact acceleration peak value is smaller than or equal to a corresponding threshold value.
In some embodiments, the outputting the high level signal includes:
outputting a high-level signal by the forward analog signal output end under the condition that the voltage peak value or the impact acceleration peak value is positive;
and under the condition that the voltage peak value or the impact acceleration peak value is negative, the negative analog signal output end outputs a high-level signal.
In some embodiments, the outputting the low level signal includes:
the positive analog signal output end and the negative analog signal output end both output low-level signals.
In some embodiments, the data processing module is specifically configured to:
and filtering the digital quantity to obtain the voltage data and/or the voltage peak value.
In some embodiments, the data processing module is further to:
and obtaining the impact acceleration data and/or the impact acceleration peak value according to the voltage data and/or the voltage peak value and the corresponding relation between the voltage value and the impact acceleration.
In some embodiments, the data processing module is further to:
and judging the impacting direction of the digital collision sensor according to the voltage peak value, and outputting a judging result to the signal output control module.
In some embodiments, the outputting the voltage data and/or the jerk data comprises:
and sending the voltage data and/or the impact acceleration data to the outside through a USART.
In some embodiments, the structure of the quartz tuning fork is U-shaped, and a straight line where two fingers of the quartz tuning fork are located is a sensitive axis of the digital collision sensor.
The digital collision sensor based on the quartz crystal provided by the invention takes the quartz tuning fork as a sensitive element, picks up charges conducted on the interdigital electrodes through the charge pick-up and amplification module, amplifies the charges to obtain voltage signals, carries out differential acquisition on the voltage signals through the signal acquisition module, processes the voltage signals through the data processing module to obtain one or more of voltage data, impact acceleration data, voltage peak values and impact acceleration peak values, and carries out digital signal output and/or analog signal output based on the data through the signal output control module.
Drawings
In order to more clearly illustrate the invention or the technical solutions in the related art, the following description will briefly explain the drawings used in the embodiments or the related art description, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is an exemplary diagram of a crash sensor composition provided by the present invention;
FIG. 2 is an exploded view of a crash sensor structure provided by the present invention;
FIG. 3 is a schematic diagram of the operation of the crash sensor provided by the present invention;
FIG. 4 is a flowchart of a portion of the operation of the crash sensor software program provided by the present invention;
fig. 5 is a diagram showing an example of the output data of the collision sensor digital signal provided by the present invention.
Detailed Description
The term "and/or" in the present invention describes an association relationship of association objects, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
The term "plurality" in the present invention means two or more, and other adjectives are similar thereto.
The terms "first," "second," and the like, herein, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention are capable of operation in sequences other than those illustrated or otherwise described herein, and that the "first" and "second" distinguishing between objects generally are not limited in number to the extent that the first object may, for example, be one or more.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Quartz crystals, also known as crystal, whose main component is silicon dioxide (SiO 2 ) Is a material with very typical piezoelectric effect and has very wide industrial application. Currently, quartz crystals for industrial production are generally produced by a growth technique and are largely used in the field of piezoelectric materials.
The shape and size of the object change under the action of external force, and are commonly called deformation. For any object, when the external force is small, the deformation is small, and after the external force disappears, the object can be restored; when the external force is large, the deformation is large, and if the deformation exceeds a certain limit due to the excessive external force, the object cannot be restored.
When the quartz crystal is subjected to external stress, the surface of the quartz crystal is deformed, charges are generated, and the stress and the surface charge density are in a linear relation, and the phenomenon is called positive piezoelectric effect. When the quartz crystal is in an electric field, corresponding deformation occurs in certain directions of the quartz crystal, and the electric field strength and the deformation are in a linear relation, so that the phenomenon is called inverse piezoelectric effect.
The collision sensor disclosed by the invention utilizes the positive piezoelectric effect of the quartz crystal, takes the quartz tuning fork as a sensitive element, generates charges by deformation of the quartz tuning fork when the sensor is collided, measures and collects the charges by a circuit, and then calculates to obtain the voltage or the impact acceleration felt by the sensor when the sensor is collided. The sensor has the advantages of easy miniaturization, high precision, high sensitivity and high reliability, and can be applied to systems such as vehicle safety airbags, impact tests, fall protection and the like.
The digital impact sensor based on quartz crystal (hereinafter referred to as impact sensor) provided by the present invention is exemplarily described below with reference to fig. 1 to 5.
As shown in fig. 1, the impact sensor provided by the present invention includes an integral structural part, a sensing element part, a circuit part and a software program part.
The integral structural portion includes a structural body and a housing, as shown in fig. 2. In some embodiments, the structural body of the crash sensor may include a sensor fixing base through which the crash sensor may be fixed on the carrier, a threaded hole through which the circuit board may be fixed, and a mounting groove through which the quartz tuning fork sensing element may be fixed. The shell can be provided with a threaded hole and a wire outlet hole, the threaded hole is used for fixedly connecting the shell with the structural body, and the wire outlet hole is used for outputting analog signals and digital signals of the collision sensor through scattered wires. The structure body and the shell can be embedded into a sealed whole, and a certain interference shielding effect is achieved on the internal circuit. In addition, in order to avoid the weak signal generated by the quartz tuning fork sensitive element from being interfered by the outside, a shielding shell can be specially designed for pins of the sensitive element so as to shield noise.
The sensitive element of the collision sensor is a tuning fork made of quartz crystal. The electrode is arranged on the interdigital of the quartz tuning fork, the interdigital deforms after collision, the surface generates charges, the charges are connected to the interdigital electrode of the tuning fork tube shell through the gold wire, and the electrode is structurally connected with an external circuit. In some embodiments, the quartz tuning fork has a U-shaped structure, and the straight line where the two fingers are located is the sensitive axis of the collision sensor.
As shown in fig. 3, the quartz tuning fork is connected to two external circuits through positive and negative electrodes, respectively. The collision sensor circuit part mainly comprises three modules, namely a charge pickup amplifying module, a power module and a signal acquisition module. The charge pickup amplification module is used for picking and amplifying two paths of charge signals conducted by the interdigital electrodes of the quartz tuning fork to obtain two paths of voltage signals. And the signal acquisition module is used for carrying out differential acquisition on the two paths of voltage signals to obtain differential voltage signals.
When the collision sensor is impacted, the interdigital deformation rule presents damping oscillation with a certain frequency, and the deformation direction and the size are consistent with the impact direction and the size. And according to the voltage obtained by differential acquisition, the direction and the magnitude of the impact of the collision sensor can be judged through processing and calculation.
In some embodiments, after the signal acquisition module performs first order low pass filtering on the two voltage signals, an ARM processor is used to acquire the two voltage signals in the circuit by using an on-chip ADC (analog-to-digital converter) with an ARM processor, and the ADC uses a differential acquisition mode to reduce errors and interference.
The collision sensor can use wide voltage to supply power, the power module is responsible for converting the wide voltage input from the outside into the voltage required by each part of elements, and isolates different power supplies, so that partial circuits of the operational amplifier can be independently supplied with power to reduce power noise interference.
The circuit board is whole to adopt soft or hard combination board mode, has so both satisfied the structure installation demand, also can keep apart charge pickup amplifier module and other circuit module, plays the effect of noise interference reduction.
As shown in fig. 1, the software program portion of the crash sensor mainly includes a data processing module and a signal output control module. The data processing module is used for converting the differential voltage signal into digital quantity and performing data processing to obtain target data, wherein the target data comprises one or more of voltage data, impact acceleration data, voltage peak value and impact acceleration peak value, and different data can be obtained through processing according to the requirement.
After the data processing module processes the target data, the signal output control module is used for outputting digital signals and/or analog signals based on the target data. That is, the collision sensor of the invention comprises two modes of digital signal output and analog signal output, can provide more choices for users, widens the application field of the collision sensor, and can be applied to the aspect of generating a trigger signal and other aspects such as measurement test.
The digital collision sensor based on the quartz crystal provided by the invention takes the quartz tuning fork as a sensitive element, picks up charges conducted on the interdigital electrodes through the charge pick-up and amplification module, amplifies the charges to obtain voltage signals, carries out differential acquisition on the voltage signals through the signal acquisition module, processes the voltage signals through the data processing module to obtain one or more of voltage data, impact acceleration data, voltage peak values and impact acceleration peak values, and carries out digital signal output and/or analog signal output based on the data through the signal output control module.
In some embodiments, the data processing module is specifically configured to:
and filtering the digital quantity to obtain voltage data and/or voltage peaks.
For example, the data processing module converts the collected differential voltage signal to generate a digital quantity, and then performs data processing on the digital quantity (data), where the data processing includes filtering processing, such as low-pass filtering, targeted notch processing, and the like, to improve measurement accuracy. The voltage data after the filtering processing can be directly output to the signal output control module. Or, the voltage data can be analyzed to determine a voltage peak value, namely, a first peak value of the voltage generated after the impact, and the voltage peak value is output to the signal output control module.
In some embodiments, the data processing module is further to:
and obtaining the impact acceleration data and/or the impact acceleration peak value according to the voltage data and/or the voltage peak value and the corresponding relation between the voltage value and the impact acceleration.
For example, the correspondence between the voltage value and the impact acceleration may be obtained in advance through the impact test, and then stored in the ARM processor of the impact sensor, where the stored correspondence may be, for example, a conversion formula between the voltage value and the impact acceleration, or a correspondence table between the voltage value and the impact acceleration, and the specific form of the present invention is not limited.
After the data processing module processes the voltage data and/or the voltage peak value, the corresponding relation between the voltage value and the impact acceleration can be directly called in a program to calculate, so as to obtain the impact acceleration data and/or the impact acceleration peak value.
In some embodiments, the data processing module is further to:
and judging the impacted direction of the digital collision sensor according to the voltage peak value, and outputting a judging result to the signal output control module.
For example, after the data processing module processes the voltage data, a voltage peak value can be found according to the voltage data, and then the impacted direction of the impact sensor is judged according to the positive and negative of the voltage peak value. For example, if the voltage peak is positive, it is determined that the collision sensor is subjected to a positive impact, and vice versa. The corresponding relation between the positive and negative of the voltage peak value and the positive and negative of the impact direction can be designed in advance so as to ensure the accuracy of the judgment result.
The data processing module can output the judgment result of the impact direction of the impact sensor to the signal output control module, and the signal output control module is used for carrying out subsequent signal output control. For example, if the collision sensor receives a forward impact and the impact exceeds a threshold, the signal output control module may enable the forward analog signal output (the output corresponding to the forward impact) to output a high level signal.
In some embodiments, the signal output control module is specifically configured to:
in a digital signal output mode, outputting voltage data and/or jerk data;
in the analog signal output mode, a corresponding level signal is output based on a comparison result of the voltage peak value or the jerk peak value with a corresponding threshold value.
For example, it is possible to select a digital signal output mode or an analog signal output mode, or both modes operate simultaneously, as desired. In the digital signal output mode, voltage data and/or impact acceleration data are mainly output, for example, voltage data, that is, voltage values corresponding to a series of sampling points, or impact acceleration data (that is, impact acceleration values corresponding to a series of sampling points) are output, or both the voltage data and the impact acceleration data are output, and can be flexibly set according to requirements.
In some embodiments, outputting the voltage data and/or the jerk data includes: and sending the voltage data and/or the impact acceleration data to the outside through the USART.
USART is a communication protocol, namely the universal synchronous/asynchronous transceiver (Universal Synchronous/Asynchronous Receiver/Transmitter) protocol. USART is a serial communication protocol that allows data transfer in both synchronous and asynchronous modes for transferring data from one device to another. USART supports full duplex and half duplex communication modes and may transfer data by interrupt mode or DMA (direct memory operation) mode. Because USART is efficient, reliable, flexible, etc., it is widely used in many embedded systems. The invention transmits data to the outside through the USART, and has stronger universality.
In the analog signal output mode, a high level signal or a low level signal is mainly output. The signal output control module may compare the voltage peak value or the impact acceleration peak value with a corresponding threshold value, for example, may preset the voltage threshold value and/or the impact acceleration threshold value, compare the voltage peak value with the voltage threshold value, or compare the impact acceleration peak value with the impact acceleration threshold value, and determine an output level signal according to a comparison result.
In some embodiments, outputting a respective level signal based on a comparison of the voltage peak or the jerk peak to a respective threshold value comprises:
if the absolute value of the voltage peak value or the absolute value of the impact acceleration peak value is larger than the corresponding threshold value, outputting a high-level signal;
and outputting a low-level signal if the absolute value of the voltage peak value or the absolute value of the impact acceleration peak value is smaller than or equal to the corresponding threshold value.
For example, the signal output control module judges the voltage peak value or the impact acceleration peak value input by the data processing module, the magnitude of the voltage peak value or the impact acceleration peak value reflects the impact magnitude of the impact sensor, and if the absolute value of the voltage peak value is larger than the voltage threshold value or the absolute value of the impact acceleration peak value is larger than the impact acceleration threshold value, the signal output control module indicates that the impact sensor is impacted greatly and outputs a high-level signal. Otherwise, if the absolute value of the voltage peak value or the absolute value of the impact acceleration peak value is smaller than or equal to the corresponding threshold value, a low-level signal is output.
In some embodiments, the high signal may be set to some voltage value signal greater than 0, such as 3.3V, 5V, etc., for a period of time. The low signal may be set to 0V for a period of time.
In some embodiments, outputting a high level signal includes:
under the condition that the voltage peak value or the impact acceleration peak value is positive, the positive analog signal output end outputs a high-level signal;
and under the condition that the voltage peak value or the impact acceleration peak value is negative, the negative analog signal output end outputs a high-level signal.
For example, two analog signal output terminals may be provided, which are respectively used for reflecting the positive impact situation and the negative impact situation, and when the voltage peak value or the impact acceleration peak value is positive, the impact direction is indicated to be positive, and at this time, the signal output control module may enable the positive analog signal output terminal (corresponding to the positive impact) to output a high-level signal; and under the condition that the voltage peak value or the impact acceleration peak value is negative, the impact direction is negative, and the signal output control module can enable the negative analog signal output end (corresponding to negative impact) to output a high-level signal. The corresponding relation can be designed in advance for setting the positive and negative analog signal output ends of the voltage peak value or the positive and negative analog signal output ends of the impact acceleration peak value and the positive and negative analog signal output ends of the impact direction, so that the final output result can accurately reflect the real situation.
In some embodiments, outputting a low level signal includes:
the positive analog signal output end and the negative analog signal output end both output low-level signals.
The magnitude of the voltage peak value or the impact acceleration peak value reflects the magnitude of impact of the impact sensor, if the absolute value of the voltage peak value or the absolute value of the impact acceleration peak value is smaller than or equal to a corresponding threshold value, the impact of the impact sensor is smaller, and the signal output control module can control the positive analog signal output end and the negative analog signal output end to output low-level signals, so that no larger impact occurs in either positive direction or negative direction.
As shown in fig. 4, a part of a working flow chart of a software program of the crash sensor is shown, and in an ARM preparation stage, clock initialization, interrupt group selection, delay waiting, GPIO (general purpose input/output) configuration, timer configuration, ADC configuration, calibration compensation parameter introduction, timer enabling and other steps are mainly performed, when the crash sensor works, the crash sensor is subjected to the crash degree by the quartz tuning fork sensitive integral structure, so that charges are generated on the surface of the tuning fork fingers through the piezoelectric effect, the charges are connected to an external circuit through a gold wire, and the charges are picked up and amplified by the circuit and converted into voltage signals, and the signals are collected by the self-carried on-chip ADC of the ARM processor and then stored in an ARM memory. The signal data is subjected to a designed processing algorithm such as filtering and the like, then signal output control is carried out, data package is carried out in a program, the data package is sent outwards through USART, threshold judgment is carried out at the same time, if the impact magnitude (such as impact acceleration peak value) of a collision sensor in a certain direction exceeds a corresponding threshold value, the analog signal output end in a corresponding direction is enabled, a high level is given, the signal output end is pulled down after lasting for a fixed time, the next judgment result is waited, and the normal operation can be ensured by continuously repeating the process in the working process of the collision sensor.
An example of a digital impact sensor based on quartz crystals designed in accordance with the present invention is described below.
The collision sensor is designed into a cube structure with the dimensions of 20mm multiplied by 20mm, and is reasonably arranged according to the shape and the size of each part. The whole structure is made of 304 stainless steel and is divided into a structural body and a shell, so that the structural strength is both considered, and the characteristics of small volume and light weight are ensured.
The collision sensor can use 7-40V wide voltage to supply power, and has the advantages of small volume, light weight, low time delay, high precision and reusability. After the sensor is fixed on the carrier, collision and impact in positive and negative directions on the sensitive shaft can be tested, the theoretical detectable collision peak acceleration range is 10 g-10000 g, and in practical application, the range adjustment can be carried out aiming at the main measurement range. The collision sensor adopts two modes of digital signal output and analog signal output, and the output mode can be selected according to different application scenes.
The collision sensor is fixed on the carrier through a through hole at the base, and the sensor sensitive shaft coincides with the direction of the carrier to be measured. The power supply is connected through the lead-out scattered lines, the collision sensor enters a working state, the collision condition of the carrier is detected in real time, and measured data is output at the updating frequency of 1000Hz through the serial port after being processed. Meanwhile, when the peak value of the impact acceleration received by the carrier exceeds a given threshold value of 300g, the lead corresponding to the collision (or impact) direction gives a 3.3V level trigger signal, and after lasting for 1ms, the lead is pulled down to start waiting for the next measuring result.
In the test, a negative impact is applied to the impact sensor, the impact pulse width is 4ms, and the impact acceleration peak value is 350g. The oscilloscope is used for collecting the analog signal output of the collision sensor, and a 3.3V level signal can be captured at the negative analog signal output end, so that the sensor can work normally and the expected effect can be met. Fig. 5 shows the data (the abscissa in the figure is the sampling point, and the ordinate is the voltage) of the digital signal output, and the data has been subjected to filtering and other processing, so that the absolute value of the voltage at the lowest point after the impact is about 2.2V, and exceeds the set voltage threshold by 2.0V, which indicates that the digital signal output can achieve the expected effect.
The collision sensor of the invention has the advantages that:
1. simple and reliable structure, small volume and light weight, and can meet various use conditions and environments.
2. The quartz crystal is adopted as a core sensitive structure, the cost is low, the technology is mature, batch manufacturing and use can be carried out, the quartz crystal has excellent impact resistance, and the maximum theoretical bearable overload reaches 10000g.
3. The sensitivity structure uses the manufacturing experience of the quartz tuning fork gyroscope as reference, the designed U-shaped structure has high measurement precision and strong sensitivity, and different collision directions can be detected.
4. The circuit principle is simple and reliable, and various noise reduction and interference shielding measures ensure the working quality and the working efficiency of the sensor.
5. The wide voltage can be used for power supply, and various power supply requirements can be met.
6. The data sampling frequency is high, the data processing is fast, the response speed of microsecond level is achieved, and the excellent low-delay performance can meet various use scenes.
7. The output signal contains both digital signals and analog signals, so that different choices are provided for users, the application field of the collision sensor is widened, and the collision sensor can be applied to the aspect of generating a trigger signal and the other aspects such as measurement and test.
The apparatus embodiments described above are merely illustrative, wherein the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A digital impact sensor based on quartz crystals, comprising:
a quartz tuning fork, which is a sensitive element of the digital collision sensor;
the charge pickup amplifying module is used for picking and amplifying two paths of charge signals conducted by the interdigital electrodes of the quartz tuning fork to obtain two paths of voltage signals;
the signal acquisition module is used for carrying out differential acquisition on the two paths of voltage signals to obtain differential voltage signals;
the data processing module is used for converting the differential voltage signals into digital quantities and performing data processing to obtain target data, wherein the target data comprises one or more of voltage data, impact acceleration data, voltage peaks and impact acceleration peaks;
and the signal output control module is used for outputting digital signals and/or analog signals based on the target data.
2. The quartz crystal based digital impact sensor of claim 1, wherein the signal output control module is specifically configured to:
outputting the voltage data and/or the jerk data in a digital signal output mode;
in the analog signal output mode, a corresponding level signal is output based on a comparison result of the voltage peak value or the jerk peak value with a corresponding threshold value.
3. The quartz crystal-based digital impact sensor of claim 2, wherein the outputting of the respective level signal based on the comparison of the voltage peak or the jerk peak with the respective threshold value comprises:
if the absolute value of the voltage peak value or the absolute value of the impact acceleration peak value is larger than the corresponding threshold value, outputting a high-level signal;
and outputting a low-level signal if the absolute value of the voltage peak value or the absolute value of the impact acceleration peak value is smaller than or equal to a corresponding threshold value.
4. The quartz crystal based digital impact sensor of claim 3, wherein the outputting a high level signal comprises:
outputting a high-level signal by the forward analog signal output end under the condition that the voltage peak value or the impact acceleration peak value is positive;
and under the condition that the voltage peak value or the impact acceleration peak value is negative, the negative analog signal output end outputs a high-level signal.
5. The quartz crystal based digital impact sensor of claim 3, wherein the outputting a low level signal comprises:
the positive analog signal output end and the negative analog signal output end both output low-level signals.
6. The digital collision sensor based on quartz crystals according to claim 1, characterized in that the data processing module is specifically adapted to:
and filtering the digital quantity to obtain the voltage data and/or the voltage peak value.
7. The quartz crystal-based digital impact sensor of claim 6, wherein the data processing module is further configured to:
and obtaining the impact acceleration data and/or the impact acceleration peak value according to the voltage data and/or the voltage peak value and the corresponding relation between the voltage value and the impact acceleration.
8. The quartz crystal-based digital impact sensor of claim 1 or 6, wherein the data processing module is further configured to:
and judging the impacting direction of the digital collision sensor according to the voltage peak value, and outputting a judging result to the signal output control module.
9. The quartz crystal-based digital impact sensor of claim 2, wherein the outputting the voltage data and/or the jerk data comprises:
and sending the voltage data and/or the impact acceleration data to the outside through a USART.
10. The quartz crystal based digital impact sensor of claim 1, wherein the quartz tuning fork has a U-shaped structure and a straight line where two fingers of the quartz tuning fork are located is a sensitive axis of the digital impact sensor.
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| CN202311517419.XA CN117537849A (en) | 2023-11-14 | 2023-11-14 | Digital collision sensor based on quartz crystal |
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| CN202311517419.XA CN117537849A (en) | 2023-11-14 | 2023-11-14 | Digital collision sensor based on quartz crystal |
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