CN215116777U - Light path adjusting device and laser wind finding radar - Google Patents
Light path adjusting device and laser wind finding radar Download PDFInfo
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- CN215116777U CN215116777U CN202120612649.4U CN202120612649U CN215116777U CN 215116777 U CN215116777 U CN 215116777U CN 202120612649 U CN202120612649 U CN 202120612649U CN 215116777 U CN215116777 U CN 215116777U
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The utility model discloses a light path adjusting device and laser anemometry radar, wherein light path adjusting device includes: the wind speed measuring device comprises a laser source, a lens and a light path adjusting module, wherein the light path adjusting module is arranged between the laser source and the lens and used for refracting a laser beam emitted by the laser source to the lens to change the light path of the laser beam, namely, the equivalent light path between the lens and the laser source is changed, so that the wind speed of measured points at different distances can be measured by the laser wind radar more conveniently. The embodiment of the application is widely applied to the technical field of laser wind measuring radars.
Description
Technical Field
The application relates to the field of laser wind-finding radars, in particular to a light path adjusting device and a laser wind-finding radar.
Background
The laser wind measuring radar technology applies the Doppler effect, measures the wind speed by measuring the frequency shift of a laser beam reflected by an air suspended matter, generally, the weak signal light scattered back by the air suspended matter and stronger local oscillation reference light led out from a light source are mixed and interfered on an optical detector, and the Doppler frequency shift of the signal light caused by the movement of the suspended matter can be determined by measuring a beat frequency spectrum output by the optical detector, so that the wind speed is obtained through inversion. One implementation method of the laser wind measuring radar technology is to use a pulse laser beam, emit a collimated beam through an optical system, and control the measuring distance by controlling the receiving time; and another implementation method is to use a continuous laser beam to focus light on a measured point through an optical system so as to obtain a reflected light signal in a Rayleigh focal depth area of the optical system at the point and the vicinity of the point. In the related art, for the scheme using the continuous laser beam, in order to measure the wind speeds of a plurality of different distances, complicated and precise object distance adjustment needs to be performed inside the radar, and the complexity is high.
SUMMERY OF THE UTILITY MODEL
The application aims at solving one of the problems existing in the related technology at least to a certain extent, and therefore the embodiment of the application provides the light path adjusting device and the laser wind radar, and the multi-distance measurement problem of the continuous convergence laser beam radar is simply and effectively solved through the light path adjusting module.
In a first aspect, an embodiment of the present application provides an optical path adjusting apparatus, including: a laser source; a lens; the optical path adjusting module is arranged between the laser source and the lens, wherein the refractive index of the optical path adjusting module is higher than that of air; the light path adjusting module is used for refracting the laser beam emitted by the laser source to the lens.
Optionally, the optical path adjusting module comprises a rotatable focusing disk; the focusing disc rotates along an axis perpendicular to the plane of the focusing disc; the focusing disc is provided with a plurality of medium flat plates with different thicknesses or refractive indexes; wherein the refractive index of the medium flat plates is higher than that of air.
Optionally, the optical path adjusting apparatus further includes: a reflection module; a rotatable scanning wedge mirror; the reflection module is arranged on one side of the lens, and the scanning wedge mirror is arranged on the other side of the lens; the reflection module is used for reflecting the laser beam refracted by the light path adjusting device to the lens; the scanning wedge mirror is used for deflecting the laser beam passing through the lens.
Optionally, the scanning wedge mirror is connected with the focusing disc through a transmission module; the transmission module is used for realizing linkage of the scanning wedge mirror and the focusing disc.
Optionally, the scanning wedge mirror is fixedly arranged on the focusing disc.
Optionally, the reflecting module is a plurality of surface reflecting mirrors or a plurality of prisms.
Optionally, the optical path adjusting module comprises a first wedge angle piece and a second wedge angle piece; wherein the first cleat piece and the second cleat piece are relatively movable.
In a second aspect, an embodiment of the present application provides a laser wind radar provided with the optical path adjusting device as described in the first aspect.
The beneficial effects of the embodiment of the application are as follows: according to the light path adjusting device provided by the embodiment of the application, the light path adjusting module is arranged between the laser source and the lens and used for refracting the laser beam emitted by the laser source to the lens, so that the light path of the laser beam is changed, namely the equivalent light path between the lens and the laser source is changed, and the laser wind radar can measure the wind speeds of the measured points at different distances more simply and conveniently.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
Fig. 1 is a first schematic view of an optical path adjustment apparatus provided in some embodiments of the present application;
FIG. 2 is a schematic diagram of a dielectric slab refracting laser light according to some embodiments of the present application;
FIG. 3 is a second schematic view of an optical path adjustment apparatus provided in some embodiments of the present application;
FIG. 4 is a third schematic view of another embodiment of a dielectric slab 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 is described in further detail 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.
It should be noted that although functional block divisions are provided in the system drawings and logical orders are shown in the flowcharts, in some cases, the steps shown and described may be performed in different orders than the block divisions in the systems or in the flowcharts. The terms first, second and the like in the description and in the claims, and the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The embodiments of the present application will be further explained with reference to the drawings.
Referring to fig. 1, fig. 1 is a first schematic view of an optical path adjusting apparatus 100 provided in some embodiments of the present application, the optical path adjusting apparatus including a laser source 110, an optical path adjusting module 120, and a lens 130, where reference numeral 140 is used to indicate an optical path of a laser beam. Because the refracting index of light path adjusting module is higher than the refracting index of air, the continuous laser beam that the laser source sent can take place to refract through light path adjusting module, light path adjusting module then refracts laser beam extremely lens. Compared with the prior art, the optical path adjusting module is added, so that the optical path of the laser beam can be changed under the condition that the physical distance between the lens and the laser source is not changed, namely the equivalent optical path between the lens and the laser source is changed, and the object distance change is generated, so that the convergence distance of the laser is changed, namely the distance from a measured point to the radar is changed.
In some embodiments, referring to fig. 1, the optical path adjusting module includes a rotatableThe focus disk being rotatable along an axis perpendicular to the plane of the focus disk. The focusing disc is provided with a plurality of medium flat plates with different thicknesses or different refractive indexes; the refractive index of the medium flat plate is higher than that of air. The medium flat plates arranged on the focusing disc are sequentially switched into the light path, so that the equivalent optical path between the lens and the light source can be changed under the condition that the physical distance between the lens and the light source is not changed, and the measuring distance is changed. Referring to fig. 2, fig. 2 is a schematic diagram of a dielectric flat plate refracting laser provided in some embodiments of the present application, and as shown in fig. 2, reference numeral 210 denotes a dielectric flat plate with a thickness t, reference numeral 220 denotes a laser source 220, reference numeral 230 denotes a virtual equivalent light source, reference numeral 240 denotes an actual optical path, and reference numeral 250 denotes a virtual equivalent optical path. Because the refractive index n of the medium flat plate is higher than that of air, the light beam emitted by the light source can be refracted by the medium flat plate, and the light source is equivalently moved forwards to an equivalent virtual light source position after being refracted. Illustratively, the dielectric slab has a thickness t and a refractive index n, since air has a refractive index n a1, after the medium plate is inserted between the lens and the laser source, the optical distance between the lens and the laser source changes, that is, the equivalent movement quantity Δ L of the light source is:
compared with the related art, after the medium flat plate is added, the position of the light source can be equivalently changed under the condition that the physical distance between the lens and the light source is not changed, so that the object distance is changed, and the measuring distance is changed.
It is understood that the dielectric plate may be made of general optical glass, or may be made of other optical media with higher refractive index, such as silicon, etc., to reduce the thickness of the required dielectric plate, the spherical aberration introduced by the dielectric plate, the optical axis translation introduced by the dielectric plate inclination, and the high-order error introduced by the dielectric plate motion error. In order to avoid loss and stray light caused by interface reflection, the surfaces of the medium flat plates are generally plated with antireflection films so as to be matched with the surrounding air medium, and residual reflected light is prevented from returning to a light source or a detector by measures such as changing the inclination angle of a focusing disc and the like so as to interfere measurement.
In some embodiments, the edge of the focusing disk is provided with a plurality of slots, and the slots can be used for accommodating medium flat plates with different thicknesses. The elastic clamping pieces can be arranged inside the slots to clamp the medium flat plates, bolts can be arranged outside the slots, and the medium flat plates with different thicknesses can be fixed through the bolts. The embodiment of the application intends to explain that the slot has certain applicability to medium flat plates with different thicknesses, that is, the focusing disc provided by the embodiment of the application can accommodate medium flat plates with different thicknesses, and the medium flat plates can be replaced according to the distance to be measured so as to achieve the purpose of measuring the wind speeds of measured points with different distances.
In another embodiment, the optical path adjusting device may be a first wedge angle piece and a second wedge angle piece, and the first wedge angle piece and/or the second wedge angle piece may move relatively. Referring to fig. 3, fig. 3 is a second schematic view of an optical path adjusting apparatus according to some embodiments of the present application. As shown in fig. 3, the first wedge plate 310 and the second wedge plate 320 can move relatively, and when the actual light path 340 emitted by the laser source 330 passes through the first wedge plate and the second wedge plate, the thickness t of the light beam passing through the first wedge plate and the second wedge plate can be changed by the relative linear movement of the first wedge plate and/or the second wedge plate, that is, the position of the equivalent virtual light source 350 is changed, so that the object distance is changed, and the change of the measurement distance is realized. The direction of movement of the first wedge is indicated by reference numeral 360 and the equivalent virtual light path is indicated by reference numeral 370 in figure 3. It will be appreciated that by relative linear movement of the two wedge segments, a continuous change in the measured distance can be achieved, i.e. measurement of any one distance within a certain range can be achieved.
It should be understood that only the movement of the first wedge piece is labeled in fig. 3, and in the implementation process of the embodiment of the present application, one of the first wedge piece and the second wedge piece may be linearly moved, or both the first wedge piece and the second wedge piece may be linearly moved, so as to implement the thickness of the laser beam passing through the first wedge piece and the second wedge piece, thereby implementing the continuous change of the measurement distance.
It can be understood that, since the plane for refracting the laser beam is much larger than the size of the laser beam in both the medium plate and the first/second wedge angle plate, the focusing distance of the laser beam is affected little by the motion errors when the first/second wedge angle plate moves or the medium plate rotates.
In the related art, patent document (CN 108717195B) discloses in paragraph [0042] a zoom lens group consisting of two aspherical lenses, wherein one aspherical lens can move back and forth to achieve free variation of focal length. However, in the process of lens movement, the error of lens mechanical movement directly reflects the convergence distance error, any jitter in the movement can also be directly converted into the optical path and even the jitter noise of the signal, and the aspheric mirror needs to realize the relatively difficult linear mechanical movement in order to adjust the focal length. In the embodiment of the application, the convergence distance is changed through the difference of the refractive indexes of the medium flat plates, so that when the size of the flat plate is larger than the light spot, the flat plate is insensitive to the position and the movement of the flat plate in the light path, and when the focusing disc moves, the convergence distance can be accurately changed to the accurate position corresponding to the thickness of the flat plate only by changing the flat plates with different thicknesses without being influenced by or not directly receiving the precision of mechanical movement.
The foregoing illustrates that the light path adjusting module provided in the embodiment of the present application is used to simply and conveniently adjust the wind measuring distance of the continuous convergence laser wind measuring radar, and the implementation process of the present disclosure is specifically illustrated with the focusing disk and the wedge as different embodiments. Since the focusing plate is switched over by using simple rotational movement, the following explains the scheme of combining the rotation of the focusing plate with other existing rotational movement, such as wedge scanning movement, and simultaneously realizing multi-distance and multi-angle measurement.
Referring to fig. 4, fig. 4 is a third schematic view of an optical path adjusting apparatus according to some embodiments of the present application. As shown in fig. 4, the implementation apparatus 400 includes a laser source 410, a medium plate 420, a lens 430, a rotating scanning wedge 450, and a reflection module 460, where reference numeral 440 is used to denote the light beam in the optical path. In fig. 4, the reflection module is disposed at one side of the lens, and the scanning wedge is disposed at the other side of the lens. The light beam is emitted by a light source, refracted by a focusing medium flat plate and irradiated onto a reflection module, the light beam is reflected to a lens by the reflection module, the light beam is irradiated to a scanning wedge lens through the lens, the light beam emitted by the lens is deflected by the scanning wedge lens, the deflected light beam is scattered by air suspended matters in a detected area, and the scattered light beam is returned by an original light path, received by an optical system in the laser radar and subjected to subsequent processing. Because the scanning wedge mirror can rotate, the scanning of the laser beam in the cone-shaped direction can be realized when the scanning wedge mirror rotates, and the laser beam completes a complete 360-degree cone-shaped scanning after the scanning wedge mirror rotates for one circle. Illustratively, the refractive index of the scanning wedge is n, and the scanning half-cone angle α, the relationship between the scanning half-cone angle α and the wedge angle Φ of the scanning wedge is as follows:
it can be understood that when medium flat plates with different thicknesses are synchronously moved with the scanning wedge mirror through mechanical fixation or transmission, the embodiment of the application uses simple rotatable scanning movement, can measure a plurality of scanning angles of measured points with a plurality of distances, and has the advantages of simple and convenient operation and low cost.
In some embodiments, the scanning wedge may be fixed to the same rotating disk as the focusing medium plate with different thickness, as shown in fig. 4, to achieve synchronous rotation of the scanning wedge and the focusing disk. In other embodiments, the scanning wedge mirror can rotate independently, or can rotate in a linkage manner with a focusing disc provided with focusing medium flat plates with different thicknesses in a gear transmission manner and the like. It is intended to be noted that the scanning wedge may rotate to implement the change of the scanning angle, and the embodiments of the present application do not limit the specific driving manner of the scanning wedge and the focusing disk carrying the focusing mechanism.
It will be appreciated that the reflective module is reflective, as shown in figure 4, and in some embodiments may be a mirror. In actual work, the whole laser wind-finding radar is arranged differently, the reflection module can be a multi-surface reflector or a plurality of prisms, and the specific arrangement of the reflection module is not limited in the embodiment of the application.
The embodiment of the application also provides a laser wind radar which is provided with the light path adjusting device. Exemplarily, assuming that a light path adjusting module in the wind-measuring radar is a medium focusing disc, a user uses the laser wind-measuring radar, and when a distance between a wind-measuring point and a lens of the laser wind-measuring radar needs to be changed, the focusing disc is rotated to irradiate a light beam emitted by a laser source onto a medium plate with a specific thickness, the medium plate refracts the laser source, so as to change an equivalent light path between the laser source and the lens, that is, change a convergence distance of laser, thereby achieving an effect of changing the distance between the wind-measuring point and the lens of the laser wind-measuring radar. Compared with a laser beam, the medium flat plate is large enough, so that the position error caused by the rotation of the focusing disc or the shaking error of the focusing disc does not or does not directly influence the adjustment of the convergence distance, the convergence distance switching is realized accurately through the simple operation of rotating the focusing disc, and the cost is low. Moreover, focusing and scanning can share the same motion mechanism, and the scheme that the convergence distance is changed by independently moving the lens or the light source is compared, so that for the whole design of the wind measuring radar, the embodiment of the application saves more space, and the whole design of the radar can achieve the purpose of performing multi-angle scanning on wind measuring points with multiple distances more compactly.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope of the present invention defined by the claims.
Claims (8)
1. An optical path adjusting apparatus, comprising:
a laser source;
a lens;
an optical path adjusting module disposed between the laser source and the lens,
wherein the refractive index of the optical path adjusting module is higher than that of air;
the light path adjusting module is used for refracting the laser beam emitted by the laser source to the lens.
2. The optical path adjustment device according to claim 1,
the optical path adjusting module comprises a rotatable focusing disc;
the focusing disc rotates along an axis perpendicular to the plane of the focusing disc;
the edge of the focusing disk is provided with a plurality of medium flat plates with different thicknesses or different refractive indexes;
wherein the refractive index of the medium flat plates is higher than that of air.
3. The optical path adjustment device according to claim 2, further comprising:
a reflection module;
a rotatable scanning wedge mirror;
the reflection module is arranged on one side of the lens, and the scanning wedge mirror is arranged on the other side of the lens;
the reflection module is used for reflecting the laser beam refracted by the light path adjusting device to the lens;
the scanning wedge mirror is used for deflecting the laser beam passing through the lens.
4. The optical path adjustment device according to claim 3,
the scanning wedge mirror is connected with the focusing disc through a transmission module;
the transmission module is used for realizing linkage of the scanning wedge mirror and the focusing disc.
5. The optical path adjustment device according to claim 3,
the scanning wedge mirror is fixedly arranged on the focusing disc.
6. The optical path adjustment device according to claim 3,
the reflecting module is a plurality of surface reflecting mirrors or a plurality of prisms.
7. The optical path adjustment device according to claim 1,
the optical path adjusting module comprises a first wedge angle piece and a second wedge angle piece;
wherein the first cleat piece and the second cleat piece are relatively movable.
8. A lidar characterized in that an optical path adjustment apparatus according to any of claims 1 to 7 is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120612649.4U CN215116777U (en) | 2021-03-25 | 2021-03-25 | Light path adjusting device and laser wind finding radar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120612649.4U CN215116777U (en) | 2021-03-25 | 2021-03-25 | Light path adjusting device and laser wind finding radar |
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| CN215116777U true CN215116777U (en) | 2021-12-10 |
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| CN202120612649.4U Active CN215116777U (en) | 2021-03-25 | 2021-03-25 | Light path adjusting device and laser wind finding radar |
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- 2021-03-25 CN CN202120612649.4U patent/CN215116777U/en active Active
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