CN113358329B - Aperture detection device - Google Patents
Aperture detection device Download PDFInfo
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- CN113358329B CN113358329B CN202110423827.3A CN202110423827A CN113358329B CN 113358329 B CN113358329 B CN 113358329B CN 202110423827 A CN202110423827 A CN 202110423827A CN 113358329 B CN113358329 B CN 113358329B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The application relates to an aperture check out test set, this aperture check out test set include first aperture blade, the fixed second aperture blade that sets up, aperture detection module and current detection module, wherein: the aperture detection module comprises a detection control unit, a conveying device, a coil device and an annular permanent magnet arranged in a conveying track of the conveying device; the first diaphragm blade and the second diaphragm blade are arranged oppositely; the transmission device is used for driving the first aperture blade and the coil device to move; the coil device is arranged in the magnetic field of the annular permanent magnet; the current detection module comprises a detection resistor and is used for detecting the induced current generated by the coil device; the detection control unit is used for determining the aperture value of the aperture detection equipment according to the detection resistor, the induced current, the magnetic field intensity of the annular permanent magnet, the movement radius of the coil device and the parameters of the coil device. Through the method and the device, the problem that the size of the aperture cannot be automatically and accurately acquired in the related technology is solved.
Description
Technical Field
The application relates to the technical field of optical equipment, in particular to a diaphragm detection device.
Background
An iris, which is a device for controlling the amount of light that passes through the lens into the light-sensing surface in the body, is typically integrated into the lens. The size of the light entering amount can be adjusted by adjusting the size of the aperture, and the light entering amount becomes smaller when the aperture becomes smaller and larger when the aperture becomes larger.
The automatic aperture technology is a technology for realizing automatic adjustment of an aperture by utilizing hardware circuit driving and software logic control, and if the automatic aperture technology is combined with an image processing technology, the automatic adjustment of the aperture size according to the image processing requirement can be realized so as to obtain the optimal image processing effect. If the size information of the aperture can be acquired in real time, the light entering amount can be effectively controlled and adjusted in time, and therefore a good image processing effect is achieved. Therefore, how to obtain the size information of the aperture in real time becomes an urgent problem to be solved in the field.
In the related art, the size of the aperture is controlled using a stepping motor as a driving source, and is roughly determined by calculating the number of driving steps of the stepping motor. However, the pitch of the stepping motor, the difference in the return stroke, and the step loss all cause errors in calculating the aperture size, so that the accuracy of the acquired aperture size is too low, and the amount of light entering cannot be effectively controlled and adjusted. In addition, since the price of the stepping motor is high, it increases the use cost of the user.
At present, no effective solution is provided for the problem that the size of the aperture cannot be automatically and accurately obtained in the related technology.
Disclosure of Invention
The embodiment of the application provides an aperture detection device, and aims to solve the problem that the size of an aperture cannot be automatically and accurately acquired in the related art at least.
In a first aspect, an embodiment of the present application provides an aperture detection apparatus, including a first aperture blade, a second aperture blade fixedly disposed, an aperture detection module, and a current detection module, wherein:
the aperture detection module comprises a detection control unit, a transmission device, a coil device and a permanent magnet; the first diaphragm blade and the coil device are provided to the conveying apparatus; the transmission device can drive the first diaphragm blade to move relative to the second diaphragm blade and drive the coil device to move relative to the permanent magnet;
the coil device is arranged in the magnetic field of the permanent magnet, and can cut magnetic induction lines generated by the permanent magnet and generate induction current when moving along with the conveying device;
the current detection module is connected with the coil device and used for detecting induced current generated by the coil device;
the detection control unit is used for determining an aperture value of the aperture detection equipment according to the induced current, the magnetic field intensity of the permanent magnet, the movement radius of the coil device and parameters of the coil device.
In some of these embodiments, the permanent magnet is an annular permanent magnet; the annular permanent magnet is arranged in the conveying track of the conveying device and close to the conveying track of the inclined section of the conveying device, and the circle center of the annular permanent magnet is the same as that of the conveying track of the inclined section of the conveying device; the transmission device is also used for driving the coil device to do circular motion around the annular permanent magnet.
In some embodiments, the current detection module further includes a detection resistor, the parameters of the coil device include a longitudinal length of the coil and a number of turns of the coil, and the aperture detection module is further configured to obtain a moving distance of the first aperture blade according to the detection resistor, the induced current, a magnetic field strength of the annular permanent magnet, a movement radius of the coil device, the longitudinal length of the coil, and the number of turns of the coil, and determine the aperture value according to the moving distance and a position where the second aperture blade is located.
In some embodiments, the coil device includes a first coil frame and a second coil frame, the first coil frame and the second coil frame are connected by a common virtual edge, wherein the first coil frame is fixed, and the second coil frame is disposed on the conveying device and follows the conveying device to move circularly around the annular permanent magnet.
In some of these embodiments, the height of the annular permanent magnet is greater than the height of the coil device.
In some embodiments, the current detection module further includes an ADC collector and a detection resistor, and the current detection module is further configured to detect a detection voltage across the detection resistor through the ADC collector, and obtain the induced current according to the detection voltage and the detection resistor.
In some embodiments, the current detection module further comprises a voltage follower, a first sampling resistor and a second sampling resistor; one end of the first sampling resistor is connected with a fixed power supply, the other end of the first sampling resistor is connected with the second sampling resistor in series, and the output end of the current detection module is led out between the first sampling resistor and the second sampling resistor;
the positive phase input end of the voltage follower is connected with the detection resistor, the negative phase input end of the voltage follower is connected with the second sampling resistor, and the output end of the voltage follower is connected with the series end of the first sampling resistor and the second sampling resistor;
the ADC collector is also used for detecting the output voltage of the output end of the current detection module; the current detection module is further configured to obtain the detection voltage according to the output voltage and the voltage of the fixed power supply.
In some embodiments, the aperture detection module is further configured to obtain an aperture movement speed of the first aperture blade according to the induced current, the detection resistance, the magnetic field strength, the coil longitudinal length, and the number of coil turns.
In some of these embodiments, the aperture detection apparatus further comprises a position calibration module; the position calibration module comprises a calibration control unit, an optical coupler and an optical coupler stop lever, wherein the optical coupler is fixedly arranged above the conveying track of the straight section of the conveying device and is parallel to the conveying track of the straight section of the conveying device; the optical coupling gear lever is connected with the conveying device and moves together with the first aperture blade along with the conveying device; the optical coupling stop lever and the first diaphragm blade keep a fixed distance relative to a conveying track of the conveying device;
the calibration control unit is used for setting an initial position of the optical coupling gear lever, acquiring a current position of the optical coupling gear lever, recalibrating the position of the first aperture blade if the current position of the optical coupling gear lever is coincident with the initial position, and restoring the recorded current aperture position to a default value; the starting position represents a position where the optical coupler is located when the optical coupler gear lever blocks the optical coupler from left to right.
In some of these embodiments, the position calibration module is further configured to obtain historical position information of the first aperture blade; and determining the position where the first diaphragm blade reaches the highest frequency according to the historical position information, and setting the initial position of the optical coupling gear lever according to the position where the first diaphragm blade reaches the highest frequency.
Compare in the correlation technique, the aperture check out test set that this application embodiment provided includes first diaphragm blade, the fixed second diaphragm blade that sets up, diaphragm detection module and current detection module, wherein: the aperture detection module comprises a detection control unit, a transmission device, a coil device and a permanent magnet; the first diaphragm blade and the coil device are arranged on the conveying device; the transmission device can drive the first diaphragm blade to move relative to the second diaphragm blade and drive the coil device to move relative to the permanent magnet; the coil device is arranged in the magnetic field of the permanent magnet, and can cut magnetic induction lines generated by the permanent magnet and generate induction current when moving along with the conveying device; the current detection module is connected with the coil device and used for detecting induced current generated by the coil device; the detection control unit is used for determining the aperture value of the aperture detection equipment according to the induced current, the magnetic field intensity of the permanent magnet, the movement radius of the coil device and the parameters of the coil device. Through the method and the device, the problem that the size of the aperture cannot be automatically and accurately acquired in the related technology is solved.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more concise and understandable description of the application, and features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a block diagram of a structure of an aperture detection apparatus according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of an aperture detecting apparatus according to an embodiment of the present application;
fig. 3 is a schematic perspective view of a coil device and a current detection module according to an embodiment of the present application;
fig. 4 is a schematic plan view of a coil device and a current detection module according to an embodiment of the present application;
fig. 5 is a schematic diagram of an integral area corresponding to discrete sampling points acquired by an ADC collector in the embodiment of the present application;
fig. 6 is a schematic structural diagram of a current detection module according to an embodiment of the present application;
FIG. 7 is a schematic structural diagram of an aperture detecting apparatus according to an embodiment of the present disclosure;
fig. 8 is a schematic diagram of the circular motion of the coil device according to the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference herein to "a plurality" means greater than or equal to two. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, "a and/or B" may indicate: a exists alone, A and B exist simultaneously, and B exists alone. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
The various techniques described herein may be applied, but are not limited to, aperture detection systems for various cameras.
Fig. 1 is a block diagram of a diaphragm detecting apparatus according to an embodiment of the present application, and as shown in fig. 1, a diaphragm detecting apparatus 100 includes a first diaphragm blade 10, a fixedly disposed second diaphragm blade 20, a diaphragm detecting module 30, and a current detecting module 40.
The aperture detection module 30 includes a detection control unit 31, a transmission device 32, a coil device 33, and a permanent magnet 34; the first diaphragm blade 10 and the coil device 33 are provided to the conveying device 32; the transfer device 32 is capable of moving the first diaphragm blade 10 relative to the second diaphragm blade 20 and the coil device 33 relative to the permanent magnet 34.
The coil device 33 is disposed in the magnetic field of the permanent magnet 34, and the coil device 33 can cut the magnetic induction lines generated by the permanent magnet 34 and generate induction currents when moving with the conveyor 32.
The current detection module 40 is connected to the coil device 33 and detects an induced current generated by the coil device 33. The detection control unit 31 is configured to determine the aperture value of the aperture detecting apparatus 100 based on the induced current, the magnetic field strength of the permanent magnet 34, the moving radius of the coil device 33, and the parameters of the coil device 33.
Note that the diaphragm is configured by the first diaphragm blade 10 and the second diaphragm blade 20, and the size of the diaphragm aperture and thus the size of the light input amount can be adjusted by changing the distance between the first diaphragm blade 10 and the second diaphragm blade 20, and therefore, the diaphragm value of the diaphragm detection apparatus 100 can be obtained from the distance between the first diaphragm blade 10 and the second diaphragm blade 20.
Further, the conveying device 32 may be a conveyor belt, or may be other conveying devices, and the application is not limited thereto.
Further, the permanent magnet 34 may be a ring-shaped permanent magnet, or may be a rectangular permanent magnet or a circular permanent magnet, and the shape of the permanent magnet 34 is not limited in the present embodiment.
Further, the transfer device 32 is connected to the first diaphragm blade 10 and the coil device 33, respectively, the first diaphragm blade 10 is disposed opposite to the second diaphragm blade 20, and the permanent magnet 34 is disposed in the transfer rail of the transfer device 32.
Since the transmission device 32 is connected to the first diaphragm blade 10 and the coil device 33, respectively, the first diaphragm blade 10 and the coil device 33 have the same moving state, so that it is possible to obtain the moving information of the coil device 33 and thus the moving information of the first diaphragm blade 10 from the moving state of the coil device 33 in the magnetic field, and to determine the current position of the first diaphragm blade 10 from the moving information and the initial position of the first diaphragm blade 10. In addition, since the second diaphragm blade 20 is fixed and the position of the second diaphragm blade 20 is fixed, it is possible to obtain the distance between the first diaphragm blade 10 and the second diaphragm blade 20 from the current position of the first diaphragm blade 10 and the position of the second diaphragm blade 20, and obtain the aperture value of the aperture detecting apparatus 100 from the distance between the first diaphragm blade 10 and the second diaphragm blade 20.
The above-described embodiment provides the diaphragm detecting apparatus 100 including the first diaphragm blade 10, the fixedly disposed second diaphragm blade 20, the diaphragm detecting module 30, and the current detecting module 40, wherein: the aperture detection module 30 includes a detection control unit 31, a transmission device 32, a coil device 33, and a permanent magnet 34; the first diaphragm blade 10 and the coil device 33 are provided to the conveying device 32; the transmission device 32 is capable of moving the first diaphragm blade 10 relative to the second diaphragm blade 20 and the coil device 33 relative to the permanent magnet 34; the coil device 33 is arranged in the magnetic field of the permanent magnet 34, and the coil device 33 can cut magnetic induction lines generated by the permanent magnet 34 and generate induction current when moving along with the conveying device; the current detection module 40 is connected to the coil device 33 and is used for detecting the induced current generated by the coil device 33; the detection control unit 31 is configured to determine the aperture value of the aperture detecting apparatus 100 based on the induced current, the magnetic field strength of the permanent magnet 34, the moving radius of the coil device 33, and the parameters of the coil device 33. According to the method, the first diaphragm blade 10 and the coil device 33 are connected through the transmission device 32, so that the first diaphragm blade 10 and the coil device 33 have a motion state, more accurate motion information of the coil device 33 can be obtained according to the motion state of the coil device 33 in a magnetic field, further motion information of the first diaphragm blade 10 is obtained, the aperture value of the aperture detection device 100 is accurately obtained according to the motion information of the first diaphragm blade 10 and the position of the second diaphragm blade 20, and the problem that the aperture size cannot be automatically and accurately obtained in the related art is solved. In addition, the aperture detection device 100 provided by the application has the advantages that the price of the adopted devices is low, and the performance cost is high.
Further, the current detection module 40 includes a detection resistor 41, and the detection control unit 31 is further configured to calculate an aperture value of the aperture detection apparatus 100 according to the detection resistor 41, the induced current, the magnetic field strength of the permanent magnet 34, the moving radius of the coil device 33, and the parameter of the coil device 33.
Further, the first diaphragm blade 10 is fixed to the transfer device 32. The second diaphragm blade 20 is fixed to the diaphragm appearance structure without relative displacement with respect to the diaphragm appearance structure.
In some embodiments, fig. 2 is a schematic structural diagram of an aperture detecting apparatus according to an embodiment of the present application, as shown in fig. 2, the permanent magnet 34 is an annular permanent magnet 34, the annular permanent magnet 34 is disposed inside a conveying track of the conveying device 32 and close to the conveying track of the inclined section of the conveying device 32, and a center of the annular permanent magnet 34 is the same as a center of the conveying track of the inclined section of the conveying device 32; the conveyor 32 is also arranged to move the coil means 33 in a circular motion around the annular permanent magnet 34.
In some of these embodiments, the height of the annular permanent magnet 34 is greater than the height of the coil device 33, such that the entire coil device 33 is completely within the magnetic field generated by the annular permanent magnet 34 throughout the movement.
In some embodiments, the current detection module 40 further includes a detection resistor 41, and the parameters of the coil device 33 include the number of coil turns and the longitudinal length of the coil. The aperture detection module 30 is further configured to obtain a moving distance of the first aperture blade 10 according to the detection resistor 41, the induced current, the magnetic field strength of the annular permanent magnet 34, the moving radius of the coil device 33, the longitudinal length of the coil, and the number of turns of the coil, and determine an aperture value according to the moving distance and the position of the second aperture blade 20.
It should be noted that, since the transmission device 32 drives the first diaphragm blade 10 and the coil device 33 to move together, the first diaphragm blade 10 and the coil device 33 have the same moving distance, so that the moving distance of the coil device 33 (i.e., the moving distance of the first diaphragm blade 10) can be obtained according to the moving state of the coil device 33 in the magnetic field.
The present embodiment relates the first diaphragm blade 10 and the coil device 33 by the transfer device 32, so that the first diaphragm blade 10 and the coil device 33 have the same moving distance, and thus the moving distance of the coil device 33 (i.e., the moving distance of the first diaphragm blade 10) is obtained from the moving state of the coil device 33 in the magnetic field, so that the aperture value of the aperture detecting apparatus 100 can be easily calculated from the moving distance of the first diaphragm blade 10 and the position of the second diaphragm blade 20, and the moving distance of the coil device 33 (i.e., the moving distance of the first diaphragm blade 10) can be more accurately calculated from the moving state of the coil device 33 in the magnetic field, and the detection accuracy of the aperture value of the aperture detecting apparatus 100 is further improved.
In some embodiments, the aperture detection module 30 is further configured to obtain the aperture moving speed of the first aperture blade 10 according to the induced current, the detection resistor 41, the magnetic field strength, the longitudinal length of the coil, and the number of coil turns.
Specifically, the magnitude and the direction of the real-time induced current can be calculated according to the induced current, the detection resistor 41, the magnetic field strength, the longitudinal length of the coil, and the number of turns of the coil, and the direction and the magnitude of the magnetic induction line cut by the coil device 33 can be analyzed according to the magnitude and the direction of the real-time induced current, so as to obtain the aperture movement speed and the aperture movement direction of the first aperture blade 10.
In some embodiments, fig. 3 is a schematic perspective view of a coil device and a current detection module according to an embodiment of the present disclosure, as shown in fig. 3, the coil device 33 includes a first coil frame 331 and a second coil frame 332, and the first coil frame 331 and the second coil frame 332 are connected by a common virtual edge g so as to form a closed loop, where the first coil frame 331 is fixed, the second coil frame 332 is disposed on the transmission device 32 and follows the transmission device 32 to perform a circular motion around the annular permanent magnet 34, a motion radius of the circular motion is a distance from the second coil frame 332 to a center of the annular permanent magnet 34, and the motion radius may be represented as r.
It should be noted that the virtual edge g only represents a virtual frame line at a connection point of the first coil frame 331 and the second coil frame 332, and is marked by a dotted line in fig. 3, and as can be seen from fig. 4 below, in an actual circuit, the first coil frame 331 and the second coil frame 332 form a closed loop, and there is no physical virtual edge g between the two.
Further, as shown in fig. 3, the first bobbin 331 represents a bobbin composed of a-side, b-side, c-side and g-side, and the second bobbin 332 represents a bobbin composed of d-side, h-side, f-side and g-side, wherein the g-side represents a virtual side at the connection point of the first bobbin 331 and the second bobbin 332.
Further, the h side of the second coil frame 332 is fixedly arranged on the conveying device 32, so that the second coil frame 332 follows the conveying device 32 to make a circular motion around the annular permanent magnet 34, wherein the motion radius r of the circular motion represents the distance from the h side to the center of the annular permanent magnet 34.
Further, the coil device 33 includes a first coil frame 331 and a second coil frame 332 formed by bending and winding a single first wire, and the number of coil turns of the coil device 33 is. Fig. 4 is a schematic plan view illustrating a coil device and a current detection module according to an embodiment of the present invention, and as shown in fig. 4, the current detection module 40 is connected to two ends of a first conducting wire through a second conducting wire 60, where the two ends of the first conducting wire are both disposed on the first coil frame 331. Therefore, the current detection module 40, the coil device 33 and the second conducting wire 60 form a closed loop, and when the coil device 33 moves circularly around the annular permanent magnet 34, the magnetic induction wire generated by the annular permanent magnet 34 is cut, an induced electromotive force is generated, and an induced current is generated in the closed loop.
Further, a wire harness device made of an insulating material may be disposed at the virtual edge g to bind the coil turns in the coil device 33, so as to avoid the problem of coil winding caused by too many coil turns.
As can be seen from fig. 2, the inner ring of the annular permanent magnet 34 is an S pole, and the outer ring is an N pole. In the cross section of the annular permanent magnet 34, the magnetic field strength at each point on a circle having the same center as the annular permanent magnet 34 is equal, and the magnetic field direction is as shown by a dotted arrow in fig. 2, that is, the magnetic field direction is outward from the center of the circle along the radial direction. Since the center of the circular permanent magnet 34 is the same as the center of the conveying track of the inclined section of the conveying device 32, and the coil device 33 moves along with the conveying device 32, the moving track of the coil device 33 and the circular permanent magnet 34 have the same center, that is, the magnetic field intensity of each point on the moving track of the coil device 33 is equal, and the magnetic field direction is outward from the center of the circle along the radius direction. The radius of movement of the coil device 33 in circular motion around the annular permanent magnet 34 can be represented by letters.
In addition, in the process of the coil movement, since the first coil frame 331 is fixed, the first coil frame 331 does not cut the magnetic induction line, and does not generate induced electromotive force. Although the d-side and the f-side of the second coil frame 332 move, the moving direction thereof forms an angle of 0 ° with the magnetic induction line generated by the annular permanent magnet 34, and therefore no induced electromotive force is generated. When only the h side moves, the included angle between the moving direction of the h side and the magnetic induction line is 90 degrees, and induced electromotive force can be generated, namely, the h side of the turn can generate induced electromotive force when moving, so that induced current is generated in the closed loop. Therefore, the induced electromotive force (i.e., the detection voltage at both ends of the detection resistor 41) can be obtained from the movement information of the turn h side in the magnetic field, the induced current generated in the closed loop can be calculated according to the induced electromotive force and the detection resistor 41 in the current detection module 40, and the aperture value of the aperture detection apparatus 100 can be obtained based on the detection resistor 41, the induced current, the magnetic field strength of the annular permanent magnet 34, the movement radius of the coil device 33, the longitudinal length of the coil, and the number of turns of the coil.
In some embodiments, the current detection module 40 further includes an ADC collector and a detection resistor 41, and the current detection module 40 is further configured to detect a detection voltage across the detection resistor 41 through the ADC collector, and obtain an induced current according to the detection voltage and the detection resistor 41.
Further, the detection voltage at the two ends of the detection resistor 41 can be calculated by a discrete sampling method, so that the induced current passing through the current detection module 40 is calculated, and the accumulated charge amount in the aperture movement process is obtained by approximately calculating the integral area.
It should be noted that, the sampling precision of the ADC collector is 10 bits, the sampling precision can reach mV level, which is very precise, and the error caused thereby is very small. The sampling rate of the ADC collector can reach at least 200K/S, the automatic diaphragm action is completed within about 500ms at the fastest speed, the calculation is carried out according to the time, the sampling is carried out once every 5ms of the ADC collector, and about 100 discrete sampling points can be obtained. The area error between the discrete integral area of 100 discrete sampling points and the continuous integral area of the continuous function can be calculated by taking a common sine function curve as an example.
Fig. 5 is a schematic diagram of corresponding integral areas of discrete sampling points acquired by an ADC acquirer in the embodiment of the present application, where a horizontal axis in fig. 5 is time t and a vertical axis is an electric charge amount
. The charge amount is the integral of the current over time, and the change of the current over time can be represented by the charge amount over time. The discrete integrated area calculated from 100 discrete sample points is 0.999917769847874, and the continuous function is usedThe calculated continuous integrated area is 1, i.e. the area error between the discrete integrated area and the continuous integrated area is 0.000082230152126. That is, the area error is about eight ten-thousandths, which is negligible in normal use.
In the embodiment, the detection voltage at the two ends of the detection resistor 41 is detected by the ADC collector, and the induced current is obtained according to the detection voltage and the detection resistor 41.
In some embodiments, fig. 6 is a schematic structural diagram of a current detection module according to an embodiment of the present disclosure, and as shown in fig. 6, the current detection module 40 further includes a voltage follower 42, a first sampling resistor 43, and a second sampling resistor 44; one end of the first sampling resistor 43 is connected with the fixed power supply, the other end is connected with the second sampling resistor 44 in series, and the output end of the current detection module 40 is led out between the first sampling resistor 43 and the second sampling resistor 44.
A non-inverting input terminal of the voltage follower 42 is connected to the detection resistor 41, an inverting input terminal of the voltage follower 42 is connected to the second sampling resistor 44, and an output terminal of the voltage follower 42 is connected to a series connection terminal of the first sampling resistor 43 and the second sampling resistor 44.
The ADC collector is also used for detecting the output voltage of the output end of the current detection module 40; the current detection module 40 is further configured to obtain a detection voltage according to the output voltage and the voltage of the fixed power supply.
The output of the current sensing module 40 may be represented as Vout, the voltage of the fixed power supply may be represented as V0, and the sensed voltage may be represented as Vin. From the output voltage Vout and the voltage V0 of the fixed power supply, a detection voltage is obtained, i.e., the detection voltage Vin can be expressed as: vin = Vout-V0/2.
It should be noted that, because the ADC collector does not support negative voltage sampling in general, a dc bias needs to be added to the detection voltage for sampling, so as to ensure that whether the detection voltage is a positive voltage or a negative voltage, the detection can be performed by the current detection module 40 provided in this embodiment, and the sense resistor is calculated according to the detection voltage and the detection resistor 41, thereby improving the applicability of the aperture detection apparatus 100.
In some of these embodiments, the aperture detection apparatus 100 further comprises an aperture driving module. The present embodiment does not limit the diaphragm driving manner of the diaphragm driving module. For example, the aperture driving module may adopt a DC-IRIS drive or a P-IRIS drive, and the embodiment is not limited. The user can select a proper diaphragm driving mode according to the requirement of actual diaphragm precision.
The aperture driving module and the aperture detecting module can be completely separated by adopting the method, the aperture driving mode of the aperture driving module is not limited in the embodiment, and the aperture detecting module provided by the embodiment can support no matter DC-IRIS driving or P-IRIS driving, so that the aperture detecting device provided by the application has stronger applicability and is convenient for large-scale application and popularization.
In some of these embodiments, the aperture detection apparatus 100 further comprises a position calibration module 50 (shown in FIG. 7); the position calibration module 50 comprises a calibration control unit 53, an optical coupler 51 and an optical coupler stop lever 52, wherein the optical coupler 51 is fixedly arranged above the conveying track of the straight section of the conveying device 32 and is parallel to the conveying track of the straight section of the conveying device 32; the optical coupling lever 52 is connected to the transmission device 32 and moves together with the first diaphragm blade 10 along with the transmission device 32; the optical coupling lever 52 is kept at a fixed distance from the first diaphragm blade 10 with respect to the conveying rail of the conveyor 32.
The calibration control unit 53 is configured to set an initial position of the optical coupling link 52, obtain a current position of the optical coupling link 52, recalibrate the position of the first aperture blade 10 if the current position of the optical coupling link 52 coincides with the initial position, and restore the recorded current aperture position to a default value; the home position indicates a position where the photo coupler 51 is located when the photo coupler lever 52 blocks the photo coupler 52 from left to right.
Further, the diaphragm driving module triggers the position calibration module 50 to perform a calibration operation on the diaphragm detecting module 30 when the first diaphragm blade 10 moves to a specific position.
It is required to be noted thatIn the amount of electric charge
The calculation error of (2) is eight ten-thousandth, and the influence on the calculation result of the aperture value in the use process is very small, but the calculation result still has certain influence after long-time error accumulation. In the actual use process of the camera, the size of the aperture can be greatly changed and the camera can reciprocate by changing day and night or changing the light intensity. The position calibration module 50 may be set using the characteristics of the reciprocal movement of the diaphragm to periodically calibrate the position of the first diaphragm blade 10, thereby eliminating the influence of error accumulation on the diaphragm value detection result.
Specifically, since the first diaphragm blade 10 and the optical coupling lever 52 are both fixed to the transmission device 32 and move together with the transmission device 32, the first diaphragm blade 10 and the optical coupling lever 52 maintain a fixed relative displacement. Therefore, it is possible to set a start position of the optical coupling lever 52 according to an initial position (i.e., a specific position) of the first diaphragm blade 10 and to set the optical coupling 51 above the start position of the optical coupling lever 52. When the optical coupler link lever 52 blocks the optical coupler 52 from left to right, it is determined that the optical coupler link lever 52 returns to the start position, that is, the current position of the optical coupler link lever 52 coincides with the start position, the position of the first aperture blade 10 is recalibrated, and the recorded current aperture position is restored to a default value.
The present embodiment performs position calibration of the entire aperture detection system by adding the position calibration module 50 to the aperture detection apparatus 100, and when the optical coupling lever 52 moves to the initial position (at this time, the first aperture blade 10 moves to the specific position), recalibrates the position of the first aperture blade 10, and restores the recorded current aperture position to the default value, thereby eliminating the influence of error accumulation on the aperture value detection result, and further improving the accuracy of the aperture value detection result.
In some of these embodiments, the position calibration module is further configured to obtain historical position information of the first aperture blade 10; the position where the first diaphragm blade 10 reaches the highest frequency is determined according to the historical position information, and the starting position of the optical coupling lever 52 is set according to the position where the first diaphragm blade 10 reaches the highest frequency.
Note that the first diaphragm blade 10 reaches a position where the frequency is the highest, that is, a specific position to which the first diaphragm blade 10 moves.
The examples of the present application are further described and illustrated below by means of specific examples.
Fig. 7 is a schematic structural diagram of an aperture detecting apparatus 100 according to an embodiment of the present application, wherein the aperture detecting apparatus 100 includes a first aperture blade 10, a fixedly disposed second aperture blade 20, an aperture detecting module 30, a current detecting module 40, and a position calibrating module 50.
The aperture detection module 30 includes a detection control unit 31, a conveyor 32, a coil device 33, and an annular permanent magnet 34 disposed in a conveying track of the conveyor 32; the first diaphragm blade 10 is disposed opposite to the second diaphragm blade 20; the transmission device 32 is respectively connected with the first diaphragm blade 10 and the coil device 33 and is used for driving the first diaphragm blade 10 and the coil device 33 to move; the annular permanent magnet 34 is close to the conveying track of the inclined section of the conveying device 32, and the circle center of the annular permanent magnet 34 is the same as that of the conveying track of the inclined section of the conveying device 32; the coil device 33 makes a circular motion around the ring-shaped permanent magnet 34.
The current detection module 40 includes a detection resistor 41, and the current detection module 40 is connected to the coil device 33 and detects the induced current generated by the coil device 33.
The position calibration module 50 comprises a calibration control unit 53, an optical coupler 51 and an optical coupler stop lever 52, wherein the optical coupler 51 is fixedly arranged above the conveying track of the straight section of the conveying device 32 and is parallel to the conveying track of the straight section of the conveying device 32; the optical coupling lever 52 is connected to the transmission device 32 and moves together with the first diaphragm blade 10 along with the transmission device 32; the optical coupling lever 52 is kept at a fixed distance from the first diaphragm blade 10 with respect to the conveying rail of the conveyor 32.
The calibration control unit 53 is configured to set an initial position of the optical coupling link 52, obtain a current position of the optical coupling link 52, recalibrate the position of the first aperture blade 10 if the current position of the optical coupling link 52 coincides with the initial position, and restore the recorded current aperture position to a default value; the home position indicates a position where the photo coupler 51 is located when the photo coupler lever 52 blocks the photo coupler 52 from left to right.
The coil device 33 is disposed in the magnetic field of the annular permanent magnet 34, and the coil device 33 can cut magnetic induction lines generated by the annular permanent magnet 34 and generate induced currents when moving. The coil device 33 includes a coil device 33 including a first coil frame 331 and a second coil frame 332 formed by bending and winding a single first wire. The coil device 33 has a number of coil turns of
. The first bobbin 331 is a bobbin composed of a, b, c, and g sides, and the second bobbin 332 is a bobbin composed of d, h, f, and g sides, wherein the g side represents a virtual side at the connection point of the first bobbin 331 and the second bobbin 332. The first coil frame 331 is fixed and the second coil frame 332 is fixed on the conveyor 32 and follows the conveyor 32 to move circularly around the annular permanent magnet 34. Although the d-side and the f-side of the second coil frame 332 move, the moving direction thereof forms an angle of 0 ° with the magnetic induction line generated by the annular permanent magnet 34, and therefore no induced electromotive force is generated. When only the h side moves, the included angle between the moving direction of the h side and the magnetic induction line is 90 degrees, induced electromotive force and induced current can be generated, and therefore the moving radius r of the circular motion is the distance from the h side to the center of the circular permanent magnet 34.
The detection control unit 31 is configured to obtain a moving distance and a diaphragm moving speed of the first diaphragm blade 10 based on the detection resistor 41, the induced current, the magnetic field strength of the annular permanent magnet 34, the moving radius of the coil device 33, the number of turns of the coil device 33, and the coil longitudinal length, and determine a diaphragm value of the diaphragm detecting apparatus 100 based on the moving distance and the position of the second diaphragm blade 20.
Fig. 8 is a schematic diagram of the circular motion of the coil device according to the embodiment of the present invention, and it can be known from lenz's law that when the magnetic flux in the coil device 33 changes, the coil device 33 will generate induced electromotive force, and the current detection module 40 passes through the second conducting wire 60 and the second conducting wire 60The two ends of the first conducting wire are connected, the current detection module 40, the coil device 33 and the second conducting wire 60 form a closed loop, and in the moving process of the coil device 33, the included angle between the moving direction of the h side and the magnetic induction line is 90 degrees, and induced electromotive force can be generated. Due to the h side is composed of
A strip of conductive wires, wherein each conductive wire cuts the induced electromotive force generated by the magnetic induction wire
Comprises the following steps:
Magnetic field strength during wire movement
Is constant and always perpendicular to the direction of motion of the conductor,
the length of the h-side wire can be defined by letters
Indicates that the h-edge moves around the annular permanent magnet 34 by a radius of motion of
Linear velocity in circular motion. Can use letters
And represents the rotation angle of the h-side in circular motion around the ring-shaped permanent magnet 34. Due to the fact that
，
Therefore, the electromotive force generated when the h side makes circular motion can be represented
Comprises the following steps:
Of h side
The length of each wire is equal to the magnetic field intensity
Is equal to each other, the strength of the magnetic field passing through each of the wires is also equal, that is, the magnitude and direction of the induced electromotive force generated by each of the wires on the h side are equal to each other, and therefore, the induced electromotive force generated by the coil device 33 is equal to each other
Is composed of
An
As a result of the end-to-end connection, the current detection module 40, the coil device 33, and the second wire 60 form a closed loop, so that the induced electromotive force generated by the coil device 33
Can be expressed as:
Can use letters
The resistance value of the sense resistor 41 is expressed by ohm's law:
thereby inducing current
Can be expressed as:
Can use letters
Indicates that the h-edge moves around the annular permanent magnet 34 by a radius of motion
The angular velocity in the circular motion of (a) is
And linear velocity
The relationship of (a) to (b) is as follows:
According to the definition of the angular velocity, the relationship with the rotation angle is as follows:
Combining equations (4) to (6), the following equation can be obtained:
Wherein the content of the first and second substances,
is a constant, charge
Is an electric current
Integration over time, and therefore, over both sides of equation (7), the following equation can be obtained:
Wherein the content of the first and second substances,
indicates that the h side moves to a rotation angle of
The total amount of charge passing through the current detection module 40.
Due to the moving distance of the first diaphragm blade 10
And a rotation angle of
The relationship between them is:
thus, the moving distance of the first diaphragm blade 10
Can be expressed as:
The moving distance of the first diaphragm blade 10 can be calculated according to the formula (9), and the aperture value of the aperture detecting apparatus 100 is calculated from the moving distance of the first diaphragm blade 10 and the position where the second diaphragm blade 20 is located.
In addition, the moving speed of the first diaphragm blade 10
And the induced current flowing through the current detecting module 40
The relationship between can be expressed as:
Wherein, the first and the second end of the pipe are connected with each other,
is a constant number of times, and is,
is an induced current detected by the current detection module 40.
Can be detected according to the induced current detected by the current detection module 40
The moving speed of the first diaphragm blade 10 is calculated
。
It should be understood by those skilled in the art that various features of the above embodiments can be combined arbitrarily, and for the sake of brevity, all possible combinations of the features in the above embodiments are not described, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides an aperture check out test set which characterized in that, includes first diaphragm blade, the fixed second diaphragm blade that sets up, diaphragm detection module and current detection module, wherein:
the aperture detection module comprises a detection control unit, a transmission device, a coil device and a permanent magnet; the first diaphragm blade and the coil device are provided to the conveying apparatus; the transmission device can drive the first diaphragm blade to move relative to the second diaphragm blade and drive the coil device to move relative to the permanent magnet;
the coil device is arranged in the magnetic field of the permanent magnet, and can cut magnetic induction lines generated by the permanent magnet and generate induction current when moving along with the conveying device;
the current detection module is connected with the coil device and used for detecting induced current generated by the coil device;
the detection control unit is used for determining an aperture value of the aperture detection device according to the induced current, the magnetic field intensity of the permanent magnet, the movement radius of the coil device and parameters of the coil device, wherein the parameters of the coil device comprise the longitudinal length of the coil and the number of turns of the coil.
2. The aperture detecting apparatus according to claim 1, characterized in that the permanent magnet is an annular permanent magnet; the annular permanent magnet is arranged in the conveying track of the conveying device and close to the conveying track of the inclined section of the conveying device, and the circle center of the annular permanent magnet is the same as that of the conveying track of the inclined section of the conveying device; the conveying device is also used for driving the coil device to do circular motion around the annular permanent magnet.
3. The aperture detection apparatus according to claim 2, wherein the current detection module further comprises a detection resistor, and the aperture detection module is further configured to obtain a moving distance of the first aperture blade according to the detection resistor, the induced current, a magnetic field strength of the annular permanent magnet, a moving radius of the coil device, a longitudinal length of the coil, and a number of turns of the coil, and determine the aperture value according to the moving distance and a position of the second aperture blade.
4. The aperture detection apparatus according to claim 2, characterized in that the coil device includes a first coil frame and a second coil frame, the first coil frame and the second coil frame being connected by a common virtual edge, wherein the first coil frame is stationary, and the second coil frame is provided on the transfer device to follow the transfer device in a circular motion around the annular permanent magnet.
5. The aperture detecting apparatus according to claim 2, wherein the height of the annular permanent magnet is larger than the height of the coil device.
6. The aperture detection device according to claim 1, wherein the current detection module further includes an ADC collector and a detection resistor, and the current detection module is further configured to detect a detection voltage across the detection resistor through the ADC collector, and obtain the induced current according to the detection voltage and the detection resistor.
7. The aperture detection apparatus according to claim 6, wherein the current detection module further comprises a voltage follower, a first sampling resistor, and a second sampling resistor; one end of the first sampling resistor is connected with a fixed power supply, the other end of the first sampling resistor is connected with the second sampling resistor in series, and the output end of the current detection module is led out between the first sampling resistor and the second sampling resistor;
the positive phase input end of the voltage follower is connected with the detection resistor, the negative phase input end of the voltage follower is connected with the second sampling resistor, and the output end of the voltage follower is connected with the series end of the first sampling resistor and the second sampling resistor;
the ADC collector is also used for detecting the output voltage of the output end of the current detection module; the current detection module is further configured to obtain the detection voltage according to the output voltage and the voltage of the fixed power supply.
8. The aperture detection apparatus according to claim 6, wherein the aperture detection module is further configured to obtain the aperture moving speed of the first aperture blade according to the induced current, the detection resistance, the magnetic field strength, the longitudinal length of the coil, and the number of coil turns.
9. The aperture detection apparatus according to claim 1, characterized in that the aperture detection apparatus further comprises a position calibration module; the position calibration module comprises a calibration control unit, an optical coupler and an optical coupler stop lever, wherein the optical coupler is fixedly arranged above the conveying track of the straight section of the conveying device and is parallel to the conveying track of the straight section of the conveying device; the optical coupling gear lever is connected with the conveying device and moves together with the first aperture blade along with the conveying device; the optical coupling stop lever and the first diaphragm blade keep a fixed distance relative to a conveying track of the conveying device;
the calibration control unit is used for setting an initial position of the optical coupler gear lever, acquiring a current position of the optical coupler gear lever, recalibrating the position of the first aperture blade if the current position of the optical coupler gear lever is coincident with the initial position, and recovering the recorded current aperture position to a default value; the starting position represents a position where the optical coupler is located when the optical coupler gear lever blocks the optical coupler from left to right.
10. The aperture detection apparatus according to claim 9, characterized in that the position calibration module is further configured to acquire historical position information of the first aperture blade; and determining the position where the first aperture blade reaches the highest frequency according to the historical position information, and setting the initial position of the optical coupling gear lever according to the position where the first aperture blade reaches the highest frequency.
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