CN116295238A - Distance measuring method and distance measuring device - Google Patents
Distance measuring method and distance measuring device Download PDFInfo
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- CN116295238A CN116295238A CN202211491027.6A CN202211491027A CN116295238A CN 116295238 A CN116295238 A CN 116295238A CN 202211491027 A CN202211491027 A CN 202211491027A CN 116295238 A CN116295238 A CN 116295238A
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- liquid lens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
- G01C3/32—Measuring distances in line of sight; Optical rangefinders by focusing the object, e.g. on a ground glass screen
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Abstract
The invention discloses a ranging method and a ranging device, and belongs to the technical field of ranging. According to the distance measuring method and the distance measuring device, the focal length of the liquid lens module can be adjusted by adjusting the current or the voltage of the liquid lens module, the current or the voltage which is introduced into the liquid lens module is obtained when a target object clearly images on the eyepiece module, the working distance corresponding to the obtained current or the obtained voltage which is introduced into the liquid lens module is inquired based on the corresponding relation between the current or the voltage which is introduced into the liquid lens module and the working distance of the liquid lens module, and the inquired working distance is the distance between the target object and the distance measuring lens.
Description
Technical Field
The invention relates to the technical field of ranging, in particular to a ranging method and a ranging device.
Background
There are generally two conventional ranging methods: pulse methods and phase methods. The pulse method ranging method is characterized in that laser emitted by the ranging device is reflected by an object to be measured and then received by the ranging device, the ranging device records the round trip time of the laser, and half of the product of the speed of light and the round trip time is the distance between the ranging device and the object to be measured, so that the pulse method ranging method is generally only suitable for long-distance ranging. The phase ranging is to perform amplitude modulation on a laser beam by using the frequency of a radio band, measure the phase delay generated by the modulated light once coming and going to the object to be measured, and convert the distance represented by the phase delay according to the wavelength of the modulated light.
Most of the existing bar code scanning devices work in short distance, if the bar code scanning devices measure distance by adopting a pulse method, the distance cannot be accurately calculated in the short distance because of too short reflection time. Although the phase ranging is suitable for short-distance high-precision measurement, the instrument has a complex structure, high cost and large volume, and is not suitable for focusing matching of a bar code reading module.
Disclosure of Invention
The invention aims to provide a distance measuring method and a distance measuring device, which have the advantages of simple steps, compact structure, small volume, low cost and capability of improving the distance measuring speed.
In order to achieve the above object, the following technical scheme is provided:
in one aspect, a ranging method is provided, wherein a ranging lens is used for measuring a distance between a target object and the ranging lens; the range finding lens comprises an objective lens module, an eyepiece lens module and a liquid lens module connected between the objective lens module and the eyepiece lens module; the ranging method comprises the following steps:
adjusting the focal length of the objective lens module and the eyepiece module, and adjusting the current or voltage fed into the liquid lens module to adjust the focal length of the liquid lens module;
judging whether the target object clearly images on the eyepiece module, if so, acquiring current or voltage which is introduced into the liquid lens module;
and inquiring the working distance corresponding to the obtained current or voltage which is introduced into the liquid lens module based on the corresponding relation between the current or voltage which is introduced into the liquid lens module and the working distance of the liquid lens module, wherein the inquired working distance is the distance between the target object and the ranging lens.
As an alternative to the distance measuring method, the step of adjusting the current or voltage supplied to the liquid lens module to adjust the focal length of the liquid lens module includes:
detecting the temperature of the liquid lens module;
inquiring the diopter of the liquid lens module corresponding to the measured temperature of the liquid lens module based on the corresponding relation between the temperature of the liquid lens module and the diopter of the liquid lens module;
and adjusting the current or voltage fed into the liquid lens module so that the diopter of the liquid lens module is equal to the queried diopter.
In another aspect, there is provided a ranging apparatus comprising:
the range finding lens comprises an objective lens module, an eyepiece lens module and a liquid lens module connected between the objective lens module and the eyepiece lens module;
the regulation and control unit comprises an identification module, an adjustment module and a control module, wherein the identification module can judge whether a target object is clearly imaged on the eyepiece module; the adjusting module is used for adjusting the current or the voltage which is introduced into the liquid lens module; the control module can record the current or voltage which is introduced into the liquid lens module when the target object clearly images the eyepiece module, and can also inquire the working distance which corresponds to the recorded current or voltage which is introduced into the liquid lens module based on the corresponding relation between the current or voltage which is introduced into the liquid lens module and the working distance of the liquid lens module, wherein the inquired working distance is the distance between the target object and the ranging lens.
As an alternative of the distance measuring device, the liquid lens module comprises a liquid lens and a temperature detecting member, wherein the temperature detecting member is used for detecting the temperature of the liquid lens, and the temperature detecting member is in communication connection with the regulating and controlling unit.
As an alternative to the distance measuring device, the control unit is a computer.
As an alternative of the distance measuring device, the liquid lens module comprises a liquid lens and two transparent protection plates respectively connected to two sides of the liquid lens.
As the alternative scheme of range unit, liquid lens module still include with two transparent protection shield one-to-one sets up the shell, two the shell all connect in liquid lens, transparent protection shield sets firmly in corresponding the shell.
As an alternative of the distance measuring device, the objective lens module includes a plurality of first lenses sequentially arranged from an object side to an image side.
As an alternative of the distance measuring device, the eyepiece module includes a plurality of second lenses sequentially arranged from the object side to the image side.
Compared with the prior art, the invention has the beneficial effects that:
according to the distance measuring method and the distance measuring device, the focal length of the liquid lens module can be adjusted by adjusting the current or the voltage of the liquid lens module, the current or the voltage which is introduced into the liquid lens module is obtained when a target object clearly images on the eyepiece module, the working distance corresponding to the obtained current or the obtained voltage which is introduced into the liquid lens module is inquired based on the corresponding relation between the current or the voltage which is introduced into the liquid lens module and the working distance of the liquid lens module, and the inquired working distance is the distance between the target object and the distance measuring lens.
Drawings
Fig. 1 is a schematic structural diagram of a ranging lens according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing a liquid lens module in a first diopter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing a liquid lens module in a second diopter according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing a state of the liquid lens module in a third diopter according to the embodiment of the present invention;
FIG. 5 is a schematic diagram of a working distance of a liquid lens module measurable by a distance measuring lens at a first diopter according to an embodiment of the present invention;
FIG. 6 is a schematic diagram showing a working distance of a liquid lens module measured by a distance measuring lens under a second diopter according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a working distance of a liquid lens module with a third diopter measurable by a distance measurement lens according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a liquid lens module according to an embodiment of the invention.
Reference numerals:
1. an objective lens module; 11. a first lens; 2. an eyepiece module; 21. a second lens; 3. a liquid lens module; 31. a liquid lens; 32. a transparent protective plate; 33. a housing.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
As shown in fig. 1-8, the present embodiment provides a ranging method, which uses a ranging lens to measure a distance between a target object and the ranging lens; the range finding lens comprises an objective lens module 1, an eyepiece lens module 2 and a liquid lens module 3 connected between the objective lens module 1 and the eyepiece lens module 2; the ranging method comprises the following steps:
s1, adjusting the focal length of the objective lens module 1 and the eyepiece module 2, and adjusting the current or voltage fed into the liquid lens module 3 to adjust the focal length of the liquid lens module 3;
s2, judging whether a target object clearly images on the eyepiece module 2, if so, acquiring current or voltage which is introduced into the liquid lens module 3;
and S3, inquiring the working distance corresponding to the obtained current or voltage fed into the liquid lens module 3 based on the corresponding relation between the current or voltage fed into the liquid lens module 3 and the working distance of the liquid lens module 3, wherein the inquired working distance is the distance between the target object and the range finding lens.
It can be understood that the hydrophilicity of the oil-water phase intersecting surface film in the liquid lens module 3 can be changed by adjusting the current or voltage fed into the liquid lens module 3, so that the film is deformed, the curvature of the liquid lens module 3 is adjusted, the diopter of the liquid lens module is changed, the purpose of adjusting the focal length of the liquid lens module 3 is finally achieved, and the objective lens module 1 and the eyepiece lens module 2 are matched to realize clear imaging with different depths of field.
According to the distance measuring method, the focal length of the liquid lens module 3 can be adjusted by adjusting the current or the voltage fed into the liquid lens module 3, the current or the voltage fed into the liquid lens module 3 is obtained when a target object is clearly imaged on the eyepiece module 2, the working distance corresponding to the obtained current or the obtained voltage fed into the liquid lens module 3 is inquired based on the corresponding relation between the current or the voltage fed into the liquid lens module 3 and the working distance of the liquid lens module 3, and the inquired working distance is the distance between the target object and the distance measuring lens.
It should be noted that, the corresponding relationship between the current or voltage introduced into the liquid lens module 3 and the working distance of the liquid lens module 3 may be obtained by calibrating through multiple tests, and the specific method and steps belong to the prior art and are not described herein.
Optionally, the step of adjusting the current or voltage to the liquid lens module 3 to adjust the focal length of the liquid lens module 3 includes:
s11, detecting the temperature of the liquid lens module 3;
s12, inquiring the diopter of the liquid lens module 3 corresponding to the measured temperature of the liquid lens module 3 based on the corresponding relation between the temperature of the liquid lens module 3 and the diopter of the liquid lens module 3;
and S13, adjusting the current or voltage fed into the liquid lens module 3 so that the diopter of the liquid lens module 3 is equal to the queried diopter.
It should be noted that, the temperature of the liquid lens module 3 itself is different, and the diopter thereof is also different, in other words, the temperature of the liquid lens module 3 itself has a linear relationship with the diopter thereof. The liquid lens module 3 is schematically shown in fig. 2-4 in three diopters, and correspondingly, the focal length of the liquid lens module 3 is different in different diopters, and the measurable working distance is different in fig. 5-7.
Before adjusting the focal length of the liquid lens module 3, detecting the temperature of the liquid lens module 3, inquiring the diopter of the liquid lens module 3 corresponding to the temperature according to the measured temperature of the liquid lens module 3, and adjusting the current or voltage fed into the liquid lens module 3 to enable the diopter of the liquid lens module 3 to be equal to the inquired diopter, so that the liquid lens module 3 can realize quick and accurate focusing, and the focusing definition is ensured.
Further, the corresponding relationship between the temperature of the liquid lens module 3 and the diopter of the liquid lens module 3 can be obtained by calibrating through multiple tests, and the specific method and steps belong to the prior art and are not described herein.
The embodiment also provides a ranging device for implementing the ranging method, wherein the ranging device comprises a ranging lens and a regulating unit, and the ranging lens comprises an objective lens module 1, an eyepiece lens module 2 and a liquid lens module 3 connected between the objective lens module 1 and the eyepiece lens module 2; the regulation and control unit comprises an identification module, an adjustment module and a control module, wherein the identification module can judge whether a target object is clearly imaged on the eyepiece module 2; the adjusting module is used for adjusting the current or the voltage which is introduced into the liquid lens module 3; the control module can record the current or voltage which is introduced into the liquid lens module 3 when the object clearly images on the eyepiece module 2, and can inquire the working distance which corresponds to the recorded current or voltage which is introduced into the liquid lens module 3 based on the corresponding relation between the current or voltage which is introduced into the liquid lens module 3 and the working distance of the liquid lens module 3, wherein the inquired working distance is the distance between the object and the range finding lens.
The distance measuring device of the embodiment has compact structure, small volume and low cost, and meanwhile, the response time of the liquid lens module 3 is short, so that quick focusing can be realized, and the distance measuring speed is further improved.
Further, the correspondence between the temperature of the liquid lens module 3 and the diopter of the liquid lens module 3 and the correspondence between the temperature of the liquid lens module 3 and the diopter of the liquid lens module 3 may be embedded in the adjusting unit in advance. In this embodiment, the control unit is a computer.
Optionally, the liquid lens module 3 includes a liquid lens 31 and a temperature detecting member, wherein the temperature detecting member is used for detecting the temperature of the liquid lens 31, and the temperature detecting member is in communication connection with the regulating unit. The temperature of the liquid lens 31 can be detected in real time by using the temperature detection part, so that the current or voltage fed into the liquid lens 31 can be regulated in real time by the regulating and controlling unit according to the detection result of the temperature detection part, thereby realizing quick and accurate focusing and ensuring the focusing definition.
Further, the temperature detecting member can make the liquid lens 31 have a temperature compensation function, and can work normally at-20 ℃ to +65 ℃ without being influenced by environmental temperature change, thereby improving focusing definition and further being beneficial to improving distance measurement accuracy.
Optionally, the liquid lens module 3 further includes two transparent protection plates 32 respectively connected to both sides of the liquid lens 31. The transparent protection plate 32 is illustratively glass. Specifically, two transparent protection plates 32 are respectively disposed on the front and rear sides of the liquid lens 31, and the transparent protection plates 32 are used to protect the liquid lens 31 without affecting the light path.
Optionally, the liquid lens module 3 further includes a housing 33 disposed in one-to-one correspondence with the two transparent protection plates 32, the two housings 33 are both connected to the liquid lens 31, and the transparent protection plates 32 are fixedly disposed on the corresponding housings 33. The transparent protection plate 32 is supported and fixed by the housing 33, and the transparent protection plate 32 is easily detached for maintenance and the like of the liquid lens 31.
Optionally, the objective lens module 1 includes a plurality of first lenses 11 arranged in order from an object side to an image side. The focal lengths of the plurality of first lenses 11 may be the same or different, and may be specifically set according to requirements. In this embodiment, the number of the first lenses 11 is three, however, in other embodiments, the number of the first lenses 11 may be one, two, four, or even more, and may be specifically set according to the requirement, which is not limited herein.
Optionally, the eyepiece module 2 includes a plurality of second lenses 21 arranged in order from the object side to the image side. The focal lengths of the plurality of second lenses 21 may be the same or different, and may be specifically set according to the requirements. In this embodiment, the number of the second lenses 21 is three, however, in other embodiments, the number of the second lenses 21 may be one, two, four, or even more, and the second lenses may be specifically set according to the requirement, which is not limited herein.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. The ranging method is characterized in that a ranging lens is used for measuring the distance between a target object and the ranging lens; the range finding lens comprises an objective lens module (1), an eyepiece lens module (2) and a liquid lens module (3) connected between the objective lens module (1) and the eyepiece lens module (2); the ranging method comprises the following steps:
adjusting the focal length of the objective lens module (1) and the eyepiece module (2), and adjusting the current or voltage fed into the liquid lens module (3) to adjust the focal length of the liquid lens module (3);
judging whether the target object clearly images on the eyepiece module (2), if so, acquiring current or voltage which is introduced into the liquid lens module (3);
based on the corresponding relation between the current or voltage fed into the liquid lens module (3) and the working distance of the liquid lens module (3), inquiring the working distance corresponding to the acquired current or voltage fed into the liquid lens module (3), wherein the inquired working distance is the distance between the target object and the ranging lens.
2. Ranging method according to claim 1, characterized in that the step of adjusting the current or voltage fed to the liquid lens module (3) to adjust the focal length of the liquid lens module (3) comprises:
detecting the temperature of the liquid lens module (3);
inquiring the diopter of the liquid lens module (3) corresponding to the measured temperature of the liquid lens module (3) based on the corresponding relation between the temperature of the liquid lens module (3) and the diopter of the liquid lens module (3);
and adjusting the current or voltage fed into the liquid lens module (3) so that the diopter of the liquid lens module (3) is equal to the queried diopter.
3. Ranging device, its characterized in that, ranging device includes:
the range finding lens comprises an objective lens module (1), an eyepiece lens module (2) and a liquid lens module (3) connected between the objective lens module (1) and the eyepiece lens module (2);
the regulation and control unit comprises an identification module, an adjustment module and a control module, wherein the identification module can judge whether a target object is clearly imaged on the eyepiece module (2); the adjusting module is used for adjusting the current or the voltage which is introduced into the liquid lens module (3); the control module can record the current or voltage which is introduced into the liquid lens module (3) when the target object clearly images the eyepiece module (2), and can inquire the working distance which corresponds to the recorded current or voltage which is introduced into the liquid lens module (3) based on the corresponding relation between the current or voltage which is introduced into the liquid lens module (3) and the working distance of the liquid lens module (3), wherein the inquired working distance is the distance between the target object and the ranging lens.
4. A distance measuring device according to claim 3, characterized in that the liquid lens module (3) comprises a liquid lens (31) and a temperature detecting member for detecting the temperature of the liquid lens (31), the temperature detecting member being in communication with the regulating unit.
5. A distance measuring apparatus according to claim 3, wherein the control unit is a computer.
6. A distance measuring device according to claim 3, characterized in that the liquid lens module (3) comprises a liquid lens (31) and two transparent protection plates (32) connected to both sides of the liquid lens (31).
7. The distance measuring device according to claim 6, wherein the liquid lens module (3) further comprises a housing (33) arranged in one-to-one correspondence with two transparent protection plates (32), the two housings (33) are both connected to the liquid lens (31), and the transparent protection plates (32) are fixedly arranged on the corresponding housings (33).
8. A distance measuring device according to claim 3, characterized in that the objective lens module (1) comprises a number of first lenses (11) arranged in order from the object side to the image side.
9. A distance measuring device according to claim 3, characterized in that the eyepiece module (2) comprises a number of second lenses (21) arranged in order from the object side to the image side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211491027.6A CN116295238A (en) | 2022-11-25 | 2022-11-25 | Distance measuring method and distance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211491027.6A CN116295238A (en) | 2022-11-25 | 2022-11-25 | Distance measuring method and distance measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116295238A true CN116295238A (en) | 2023-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211491027.6A Pending CN116295238A (en) | 2022-11-25 | 2022-11-25 | Distance measuring method and distance measuring device |
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| Country | Link |
|---|---|
| CN (1) | CN116295238A (en) |
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2022
- 2022-11-25 CN CN202211491027.6A patent/CN116295238A/en active Pending
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