CN105891813A - Mobile terminal and method thereof for measuring distance on the basis of focusing function of mobile terminal camera - Google Patents
Mobile terminal and method thereof for measuring distance on the basis of focusing function of mobile terminal camera Download PDFInfo
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- CN105891813A CN105891813A CN201610194236.2A CN201610194236A CN105891813A CN 105891813 A CN105891813 A CN 105891813A CN 201610194236 A CN201610194236 A CN 201610194236A CN 105891813 A CN105891813 A CN 105891813A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/12—Systems for determining distance or velocity not using reflection or reradiation using electromagnetic waves other than radio waves
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Abstract
The invention provides a mobile terminal and a method thereof for measuring distance on the basis of a focusing function of a mobile terminal camera. The method comprises steps of: determining an object to be tested or an area to be tested; focusing the object to be tested or the area to be tested; acquiring the displacement distance of a lens in the focusing process; computing the distance between the object to be tested or the area to be tested and the camera according to the displacement distance of the lens and the effective focal length of the camera. Compared with the prior art, the mobile terminal and the method thereof for measuring distance on the basis of the focusing function of the mobile terminal camera acquire the displacement distance of the lens by using the focusing operation of the mobile terminal camera, compute the distance between the object to be tested or the area to be tested and the camera in combination with the inherent focal length information of the camera, and achieve a purpose of measuring the distance between the object to be tested or the area to be tested and the camera while not adding extra hardware equipment. The invention provides users with a convenient range finding scheme.
Description
Technical field
The present invention relates to the technical field of range measurement, be specifically related to a kind of mobile terminal and based on mobile terminal phase
The method that machine focus function realizes measuring distance.
Background technology
Nowadays the mobile device such as smart mobile phone, panel computer carries various sensors so that it is omnipotent.Mobile device
On also have the sensor setting up various measurement distances, such as: be provided with laser sensor, utilize laser sensor to penetrate to target object
Going out the thinnest a branch of laser, photoelectric cell receive the laser beam of target reflection, timer measures light beam from being transmitted into reception
Time, and then calculate the laser sensor distance to target object.Although said method can reach the purpose of range finding, but all
Hardware cost to be increased.
The structure put set up by camera as a kind of mobile device, how to realize surveying in the case of not increasing other hardware costs
Span from function, be technical key point.
Summary of the invention
The embodiment of the present invention provides a kind of mobile terminal and realizes measuring distance based on mobile terminal camera focus function
Method, need the technology increasing extra cost to ask solving the range finding inconvenience of mobile device in prior art or distance measurement function
Topic.
For solving the problems referred to above, embodiments provide a kind of side realizing measuring distance based on camera focus function
Method, described method includes:
Determine object under test or region to be measured；
Described object under test or region to be measured are focused；
Obtain the displacement of camera lens in focus process；
Displacement according to described camera lens and the effective focal length of camera are calculated described object under test or to be measured
Distance between region and camera.
According to one preferred embodiment of the present invention, the described displacement according to described camera lens and the effective focal length meter of camera
Calculating obtains in the step of the distance between described object under test or region to be measured and camera, meets equation below:
Wherein, EFL is the effective focal length of camera, i.e. image distance, and unit is millimeter；
LP is the displacement of camera lens, and unit is micron；L be between object under test or region to be measured and camera away from
From, unit it is centimetre.
According to one preferred embodiment of the present invention, the step focused described object under test or region to be measured is concrete
For: control circuit controls electric current to the voice coil motor input being fixed in lens bracket by spring, makes described voice coil motor exist
Control to drive described camera lens to move under the effect of electric current.
According to one preferred embodiment of the present invention, described voice coil motor drives described camera lens to move under the effect controlling electric current
Time, meet equation below: x=K*BI/k；Wherein, K is constant, and B is magnetic field intensity, and I is for controlling current value, and k is the bullet of spring
Force coefficient, x is the distance that camera lens moves.
According to one preferred embodiment of the present invention, described method also includes the described object under test recorded or region to be measured
And the range information between camera is shown to user by display device.
For solving above-mentioned technical problem, the present invention also provides for a kind of mobile terminal being provided with camera, described mobile terminal bag
Include: determine module, Focusing module, acquisition module and computing module；Wherein it is determined that module is used for determining object under test or treating
Survey region；Focusing module is used for controlling camera and focuses described object under test or region to be measured；Acquisition module is used for obtaining
Take the displacement of camera lens in focus process；Computing module is for the displacement according to described camera lens and effective Jiao of camera
Away from the distance being calculated between described object under test or region to be measured and camera.
According to one preferred embodiment of the present invention, described computing module is at the displacement according to described camera lens and camera
When effective focal length is calculated the distance between described object under test or region to be measured and camera, meet equation below:
Wherein, EFL is the effective focal length of camera, i.e. image distance, and unit is millimeter；
LP is the displacement of camera lens, and unit is micron；L be between object under test or region to be measured and camera away from
From, unit it is centimetre.
According to one preferred embodiment of the present invention, described Focusing module is controlling camera to described object under test or district to be measured
Time focusing in territory, control electricity specifically for control circuit to the voice coil motor input being fixed in lens bracket by spring
Stream, makes described voice coil motor drive described camera lens to move under the effect controlling electric current.
According to one preferred embodiment of the present invention, described voice coil motor drives described camera lens to move under the effect controlling electric current
Time, meet equation below: x=K*BI/k；Wherein, K is constant, and B is magnetic field intensity, and I is described current value, and k is described spring
Spring ratio, x is the distance that camera lens moves.
According to one preferred embodiment of the present invention, described mobile terminal also includes display module, and described display module is used for will
Range information between the described object under test or region to be measured and the camera that record is shown to user.
Relative to prior art, mobile terminal that the present invention provides and realize surveying based on mobile terminal camera focus function
Span from method, utilize mobile terminal camera focus operation obtain camera lens displacement, and combining camera intrinsic focal length letter
Breath, can be calculated the distance between object under test or region to be measured and camera, can the most additionally increase hardware unit
Under conditions of, it is achieved the purpose of the distance between measurement object under test or region to be measured and camera.Provide the user a kind of fast
Victory ranging scheme easily.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is that the present invention realizes measuring the flow process signal of method one preferred embodiment of distance based on camera focus function
Figure；
Fig. 2 is the image-forming principle schematic diagram of distance measurement method in Fig. 1 embodiment；
Fig. 3 is the structure composition frame chart that the present invention is provided with camera mobile terminal；And
Fig. 4 is the structural representation of mobile terminal one entity apparatus of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the present invention is described in further detail.Implement it is emphasized that following
Example is merely to illustrate the present invention, but is not defined the scope of the present invention.Same, following example are only the portion of the present invention
Point embodiment and not all embodiments, the institute that those of ordinary skill in the art are obtained under not making creative work premise
There is other embodiments, broadly fall into the scope of protection of the invention.
Referring to Fig. 1, Fig. 1 is method one preferred embodiment that the present invention realizes measuring distance based on camera focus function
Schematic flow sheet, the method includes but not limited to following steps.
Step S100, determines object under test or region to be measured.
In the step s 100, user can enter camera interface, clicks on object under test or region to be measured by touch-control.Should
Method is used for mobile terminal, and mobile terminal can be specifically that smart mobile phone, panel computer etc. have taking the photograph of pick-up lens (camera)
As equipment.Object under test can be specifically the entity in the presence of people, animal, plant and life.
Focus in step S110, measuring targets or region to be measured.
In step s 110, the step that measuring targets or region to be measured carry out focusing is particularly as follows: control circuit is to logical
Cross the voice coil motor input control electric current that spring is fixed in lens bracket, make voice coil motor drive under the effect controlling electric current
Camera lens moves.Voice coil motor (Voice Coil Actuator/Voice Coil Motor), is that one converts electrical energy into machine
The device of tool energy, and realize linear type and the motion of limited pivot angle.Utilize the magnetic field from permanent-magnet steel and hot-wire coil conductor
In the magnetic field produced, interacting between magnetic pole produces the device of regular motion.Camera controls voice coil loudspeaker voice coil by controlling current value
Motor and then moving lens, so the position controlling current value and camera lens is one to one.When focusing successfully every time, obtain
To control current value when focusing successfully.Just may be used by voice coil motor controls the linear relationship of current value and voice coil motor displacement
To calculate the shift length of camera lens.
Step S120, obtains the displacement of camera lens in focus process.
In the step s 120, when voice coil motor drives camera lens to move under the effect controlling electric current, equation below is met: x
=K*BI/k；Wherein, K is constant, and B is magnetic field intensity, and I is for controlling current value, and k is the spring ratio of spring, and x is that camera lens moves
Distance.Refer to the image-forming principle schematic diagram that Fig. 2, Fig. 2 are distance measurement methods in Fig. 1 embodiment.
Step S130, is calculated object under test or to be measured according to the displacement of camera lens and the effective focal length of camera
Distance between region and camera.
In step s 130, when calculating the distance between object under test or region to be measured and camera, meet equation below:Wherein, EFL is the effective focal length of camera, i.e. image distance, and unit is millimeter；LP is the shifting of camera lens
Dynamic distance, unit is micron；L is the distance between object under test or region to be measured and camera, and unit is centimetre.
Control camera measuring targets or region to be measured carry out the operation focused, and determine the camera lens after focus operation and shifting
Distance between sensitive chip in dynamic terminal, using this distance as effective focal length EFL of image distance, i.e. camera.Wherein, focusing is individual
Optical concept, camera lens can regard as a convex lens.Light can be reflected by convex lens, and refractive index is fixing, thus like
The rays pass through lens of angle just converges to same point, thus imaging.Focus operation is exactly that the distance according to scenery is different, adjusts
The position of whole lens, so that imaging point is positioned on photo-sensitive cell, i.e. imaging point is positioned on the sensitive chip of mobile terminal.Picture
Away from being as the distance between plane mirror (or photocentre of lens), i.e. the subject image distance camera lens that target object reflects
Distance between Tou.
When camera module design completes, the imageing sensor of module, camera lens, optical system etc. have been fixed up
, these parameters typically can not change on the equipment such as mobile phone.So the camera effective focal length of mobile terminal is all fixed size
, just can acquire these information by obtaining hardware information.According to image distance, the displacement of camera lens and above-mentioned formula, i.e.
The distance between object under test or region to be measured and camera can be calculated.
Further, the method also includes the range information between the object under test recorded or region to be measured and camera
Be shown to the step of user by display device, this step is within the scope of skilled artisans appreciate that, the most not
Repeat again.
Relative to prior art, the side realizing measuring distance based on mobile terminal camera focus function that the present invention provides
Method, utilizes mobile terminal camera focus operation to obtain the displacement of camera lens, and the intrinsic focus information of combining camera, can calculate
Obtain the distance between object under test or region to be measured and camera, can be real under conditions of the most additionally increasing hardware unit
The now purpose of the distance between measurement object under test or region to be measured and camera.Provide the user one fast to find range easily
Scheme.
Referring to Fig. 3, Fig. 3 is the structure composition frame chart that the present invention is provided with camera mobile terminal, this mobile terminal include but
It is not limited to consisting of module: determine module 210, Focusing module 220, acquisition module 230, computing module 240 and display mould
Block 250.
Specifically, this determines module 210, Focusing module 220, acquisition module 230, computing module 240 and display mould
Block 250 is connected with each other.Determine that module 210 is for determining object under test or region to be measured.User can enter camera interface, logical
Cross touch-control and click on object under test or region to be measured.Mobile terminal can be specifically that smart mobile phone, panel computer etc. have shooting
The picture pick-up device of camera lens (camera).Object under test can be specifically the entity in the presence of people, animal, plant and life.
Focusing module 220 is focused for measuring targets or region to be measured.Focusing module 220 measuring targets or
The process that person region to be measured carries out focusing is particularly as follows: control circuit (not indicating in figure) is fixed in lens bracket to by spring
Voice coil motor input control electric current, make voice coil motor control electric current effect under drive camera lens move.Voice coil motor
(Voice Coil Actuator/Voice Coil Motor), is a kind of device converting electrical energy into mechanical energy, and realizes
Linear type and the motion of limited pivot angle.Utilize in the magnetic field produced from the magnetic field of permanent-magnet steel and hot-wire coil conductor between magnetic pole
Interact produce regular motion device.Camera controls voice coil motor and then moving lens by controlling current value,
So the position controlling current value and camera lens is one to one.When focusing successfully every time, get control when focusing successfully
Current value processed.The position of camera lens just can be calculated by voice coil motor controls the linear relationship of current value and voice coil motor displacement
Move distance.
Acquisition module 230 is for obtaining the displacement of camera lens in focus process.Voice coil motor is controlling the effect of electric current
When lower drive camera lens moves, meet equation below: x=K*BI/k；Wherein, K is constant, and B is magnetic field intensity, and I is for controlling electric current
Value, k is the spring ratio of spring, and x is the distance that camera lens moves.
Computing module 240 for according to the displacement of camera lens and the effective focal length of camera be calculated object under test or
Distance between person region to be measured and camera.Calculate between object under test or region to be measured and camera at computing module 240
During distance, meet equation below:Wherein, EFL is the effective focal length of camera, i.e. image distance, unit
For millimeter；LP is the displacement of camera lens, and unit is micron；L is the distance between object under test or region to be measured and camera,
Unit is centimetre.
Control camera measuring targets or region to be measured carry out the operation focused, and determine the camera lens after focus operation and shifting
Distance between sensitive chip in dynamic terminal, using this distance as effective focal length EFL of image distance, i.e. camera.Wherein, focusing is individual
Optical concept, camera lens can regard as a convex lens.Light can be reflected by convex lens, and refractive index is fixing, thus like
The rays pass through lens of angle just converges to same point, thus imaging.Focus operation is exactly that the distance according to scenery is different, adjusts
The position of whole lens, so that imaging point is positioned on photo-sensitive cell, i.e. imaging point is positioned on the sensitive chip of mobile terminal.Picture
Away from being as the distance between plane mirror (or photocentre of lens), i.e. the subject image distance camera lens that target object reflects
Distance between Tou.
When camera module design completes, the imageing sensor of module, camera lens, optical system etc. have been fixed up
, these parameters typically can not change on the equipment such as mobile phone.So the camera effective focal length of mobile terminal is all fixed size
, just can acquire these information by obtaining hardware information.According to image distance, the displacement of camera lens and above-mentioned formula, i.e.
The distance between object under test or region to be measured and camera can be calculated.
Display module 250 is then for by the range information between the described object under test recorded or region to be measured and camera
Being shown to user, the structure concrete about display module 250 and function technical characteristic, skilled artisans appreciate that
Within the scope of, here is omitted.It is above the simple introduction of functional module each to mobile terminal, detailed about each functional module
Thin work process, refers to the associated description in above-described embodiment.
Relative to prior art, the mobile terminal being provided with camera that the present invention provides, utilize mobile terminal camera focusing dynamic
Make to obtain the displacement of camera lens, and the intrinsic focus information of combining camera, object under test or region to be measured can be calculated
And the distance between camera, can be under conditions of the most additionally increasing hardware unit, it is achieved measure object under test or district to be measured
The purpose of the distance between territory and camera.Provide the user a kind of quick distance-measuring equipment easily.
Refer to the structural representation that Fig. 4, Fig. 4 are mobile terminal one entity apparatus of the present invention, the device of present embodiment
Can perform the step in said method, related content refers to the detailed description in said method, does not repeats them here.
This mobile terminal includes the memorizer 12 that processor 11 couples with processor 11.
Memorizer 12 is for storing operating system, the program of setting, the first vector quantization data.
Processor 11 is used for determining object under test or region to be measured；Focus in measuring targets or region to be measured；
Obtain the displacement of camera lens in focus process；And be calculated treat according to the displacement of camera lens and the effective focal length of camera
Survey the distance between object or region to be measured and camera.
Processor 11 is specifically for clicking on object under test or region to be measured by touch-control.The method is used for mobile terminal,
Mobile terminal can be specifically the picture pick-up device that smart mobile phone, panel computer etc. have pick-up lens (camera).Object under test has
Body can be the entity in the presence of people, animal, plant and life.
Control circuit controls electric current to the voice coil motor input being fixed in lens bracket by spring, makes voice coil motor exist
Control under the effect of electric current, to drive camera lens to move.Voice coil motor (Voice Coil Actuator/Voice Coil Motor),
It is a kind of device converting electrical energy into mechanical energy, and realizes linear type and the motion of limited pivot angle.Utilize from permanent-magnet steel
Magnetic field and the magnetic field that produces of hot-wire coil conductor in interacting between magnetic pole produce the device of regular motion.Camera leads to
Cross control current value and control voice coil motor and then moving lens, so the position controlling current value and camera lens is one to one.
When focusing successfully every time, get control current value when focusing successfully.By voice coil motor controls current value and voice coil loudspeaker voice coil
The linear relationship of motor displacement just can calculate the shift length of camera lens.
When voice coil motor drives camera lens to move under the effect controlling electric current, meet equation below: x=K*BI/k；Wherein,
K is constant, and B is magnetic field intensity, and I is for controlling current value, and k is the spring ratio of spring, and x is the distance that camera lens moves.
When calculating the distance between object under test or region to be measured and camera, meet equation below:
Wherein, EFL is the effective focal length of camera, i.e. image distance, and unit is millimeter；LP is the displacement of camera lens, and unit is micron；L is
Distance between object under test or region to be measured and camera, unit is centimetre.
Control camera measuring targets or region to be measured carry out the operation focused, and determine the camera lens after focus operation and shifting
Distance between sensitive chip in dynamic terminal, using this distance as effective focal length EFL of image distance, i.e. camera.Wherein, focusing is individual
Optical concept, camera lens can regard as a convex lens.Light can be reflected by convex lens, and refractive index is fixing, thus like
The rays pass through lens of angle just converges to same point, thus imaging.Focus operation is exactly that the distance according to scenery is different, adjusts
The position of whole lens, so that imaging point is positioned on photo-sensitive cell, i.e. imaging point is positioned on the sensitive chip of mobile terminal.Picture
Away from being as the distance between plane mirror (or photocentre of lens), i.e. the subject image distance camera lens that target object reflects
Distance between Tou.
When camera module design completes, the imageing sensor of module, camera lens, optical system etc. have been fixed up
, these parameters typically can not change on the equipment such as mobile phone.So the camera effective focal length of mobile terminal is all fixed size
, just can acquire these information by obtaining hardware information.According to image distance, the displacement of camera lens and above-mentioned formula, i.e.
The distance between object under test or region to be measured and camera can be calculated.
Processor 11 leads to also particularly useful for by the range information between the object under test recorded or region to be measured and camera
Crossing display device and be shown to user, within the scope of skilled artisans appreciate that, here is omitted.
In several embodiments provided by the present invention, it should be understood that disclosed system, apparatus and method, can
To realize by another way.Such as, device embodiments described above is only schematically, such as, module or
The division of unit, is only a kind of logic function and divides, and actual can have other dividing mode, the most multiple unit when realizing
Or assembly can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not performs.Another point, institute
The coupling each other shown or discuss or direct-coupling or communication connection can be by some interfaces, device or unit
INDIRECT COUPLING or communication connection, can be electrical, machinery or other form.
The unit illustrated as separating component can be or may not be physically separate, shows as unit
Parts can be or may not be physical location, i.e. may be located at a place, or can also be distributed to multiple network
On unit.Some or all of unit therein can be selected according to the actual needs to realize the mesh of present embodiment scheme
's.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is possible to
Being that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.Above-mentioned integrated
Unit both can realize to use the form of hardware, it would however also be possible to employ the form of SFU software functional unit realizes.
If integrated unit is using the form realization of SFU software functional unit and as independent production marketing or use, can
To be stored in a computer read/write memory medium.Based on such understanding, technical scheme substantially or
Say completely or partially can embodying of the part that prior art is contributed or this technical scheme with the form of software product
Out, this computer software product is stored in a storage medium, including some instructions with so that a computer equipment
(can be personal computer, server, or the network equipment etc.) or processor (processor) perform the present invention, and each is implemented
All or part of step of methods.And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM,
Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. various
The medium of program code can be stored.
The foregoing is only the section Example of the present invention, not thereby limit the scope of the invention, every utilization
Equivalent device or equivalence flow process that description of the invention and accompanying drawing content are made convert, or it is relevant to be directly or indirectly used in other
Technical field, be the most in like manner included in the scope of patent protection of the present invention.
Claims (10)
1. the method realizing measuring distance based on camera focus function, it is characterised in that described method includes:
Determine object under test or region to be measured；
Described object under test or region to be measured are focused；
Obtain the displacement of camera lens in focus process；
Displacement and the effective focal length of camera according to described camera lens are calculated described object under test or region to be measured
And the distance between camera.
Method the most according to claim 1, it is characterised in that the described displacement according to described camera lens and camera
Effective focal length is calculated in the step of the distance between described object under test or region to be measured and camera, meets following public
Formula:
Wherein, EFL is the effective focal length of camera, i.e. image distance, and unit is millimeter；
LP is the displacement of camera lens, and unit is micron；L is the distance between object under test or region to be measured and camera, single
Position be centimetre.
Method the most according to claim 1, it is characterised in that described object under test or region to be measured are focused
Step, particularly as follows: control circuit controls electric current to the voice coil motor input being fixed in lens bracket by spring, makes described sound
Coil motor drives described camera lens to move under the effect controlling electric current.
Method the most according to claim 3, it is characterised in that described voice coil motor drives institute under the effect controlling electric current
State camera lens when moving, meet equation below: x=K*BI/k；Wherein, K is constant, and B is magnetic field intensity, and I is for controlling current value, k
For the spring ratio of spring, x is the distance that camera lens moves.
Method the most according to claim 1, it is characterised in that described method also include the described object under test recorded or
Range information between person region to be measured and camera is shown to user by display device.
6. the mobile terminal being provided with camera, it is characterised in that described mobile terminal includes:
Determine module, be used for determining object under test or region to be measured；
Focusing module, is used for controlling camera and focuses described object under test or region to be measured；
Acquisition module, for obtaining the displacement of camera lens in focus process；
Computing module, for being calculated described object under test according to the displacement of described camera lens and the effective focal length of camera
Or the distance between region to be measured and camera.
Mobile terminal the most according to claim 6, it is characterised in that described computing module is in the movement according to described camera lens
When the effective focal length of distance and camera is calculated the distance between described object under test or region to be measured and camera, meet
Equation below:
Wherein, EFL is the effective focal length of camera, i.e. image distance, and unit is millimeter；
LP is the displacement of camera lens, and unit is micron；L is the distance between object under test or region to be measured and camera, single
Position be centimetre.
Mobile terminal the most according to claim 6, it is characterised in that described Focusing module is controlling camera to described to be measured
Time focusings in object or region to be measured, specifically for control circuit to the voice coil loudspeaker voice coil horse being fixed in lens bracket by spring
Reach input and control electric current, make described voice coil motor drive described camera lens to move under the effect controlling electric current.
Mobile terminal the most according to claim 8, it is characterised in that described voice coil motor carries under the effect controlling electric current
When dynamic described camera lens moves, meet equation below: x=K*BI/k；Wherein, K is constant, and B is magnetic field intensity, and I is described electric current
Value, k is the spring ratio of described spring, and x is the distance that camera lens moves.
Mobile terminal the most according to claim 6, it is characterised in that described mobile terminal also includes display module, described
Display module is for being shown to user by the range information between the described object under test recorded or region to be measured and camera.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856422A (en) * | 2019-02-19 | 2019-06-07 | 成都京东方光电科技有限公司 | Acceleration transducer, acceleration measurement device and method |
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