CN209858869U - Laser attenuator capable of being automatically adjusted - Google Patents
Laser attenuator capable of being automatically adjusted Download PDFInfo
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- CN209858869U CN209858869U CN201920759967.6U CN201920759967U CN209858869U CN 209858869 U CN209858869 U CN 209858869U CN 201920759967 U CN201920759967 U CN 201920759967U CN 209858869 U CN209858869 U CN 209858869U
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Abstract
The utility model relates to a laser attenuator capable of automatic adjustment; the laser attenuator comprises a lens barrel which is horizontally arranged, wherein an inlet concave lens, an inlet convex lens and a diaphragm are sequentially arranged in a light inlet of the lens barrel, a power output end of a diaphragm adjusting mechanism is connected with an adjusting handle of the diaphragm, a fixed polarizer and a rotary polarizer are arranged between the inlet convex lens and the diaphragm, a second partial reflector, an outlet concave lens and an outlet convex lens are sequentially arranged in a light outlet of the lens barrel, a first partial reflector is arranged between the diaphragm and the outlet convex lens, and a laser area sensor and a laser energy meter probe are respectively positioned in reflection light paths of the first partial reflector and the second partial reflector; the rotating shafts of two stepping motors in the control circuit are respectively connected with the diaphragm adjusting mechanism and the power input end of the rotary polarizer, and the signal input port of the control circuit is connected with the laser area sensor and the laser energy meter probe; the utility model discloses can adjust the energy and the cross-sectional area of laser beam in real time, control accuracy, precision height.
Description
The technical field is as follows:
the utility model relates to a laser attenuator, in particular to but automatically regulated's laser attenuator.
Background art:
at present, laser is applied in many fields such as scientific research, industry, need adjust the size of laser energy in the use, just need use laser attenuator in the adjustment process, current laser attenuator adopts fixed decay rate more, or adopts non-intelligent open-loop control modes such as manual regulation decay rate, because the energy that the laser instrument sent has the fluctuation in the use, and laser attenuator can not adjust by oneself according to the condition, this can lead to the energy of the laser behind laser attenuator also can fluctuate, influences the result of use of laser. In addition, in some cases, the laser pulse energy is high, but the existing laser attenuator is not provided with a device for reducing the laser energy density, so that the laser attenuation module needs to bear high laser energy density, an expensive high-laser-energy-density-resistant device is required to be used, and the device is easy to damage, so that the function of the laser attenuator is reduced. In addition, the conventional laser attenuator does not have the function of adjusting the cross section size of a laser beam, is inconvenient to use, although a laser beam expander or a beam reducer can be used, the conventional laser beam expander or the conventional laser beam reducer is mostly fixed in expansion rate or reduction rate, a special beam expander or a special beam reducer needs to be designed for each specific application, and the conventional beam expander or the conventional beam reducer is poor in universality, cannot automatically adjust the expansion rate or the reduction rate, and is inconvenient to use.
The utility model has the following contents:
the to-be-solved technical problem of the utility model is: the laser attenuator capable of being automatically adjusted can automatically adjust the energy and the cross-sectional area of a laser beam in real time to enable the energy and the cross-sectional area of the laser beam to be stabilized at set values, and is accurate in control, high in precision and low in cost.
The technical scheme of the utility model:
an automatically adjustable laser attenuator comprises a lens barrel which is horizontally arranged, wherein the front end of the lens barrel is provided with a light inlet, the rear end of the lens barrel is provided with a light outlet, the automatically adjustable laser attenuator also comprises an inlet concave lens, an inlet convex lens, an outlet concave lens, an outlet convex lens, a fixed polarizer, a rotary polarizer, a diaphragm adjusting mechanism, a first partial reflector, a second partial reflector, a laser area sensor, a laser energy meter probe and a control circuit, the inlet concave lens, the inlet convex lens, the outlet concave lens, the outlet convex lens, the fixed polarizer, the rotary polarizer, the diaphragm adjusting mechanism, the first partial reflector, the second partial reflector, the laser energy area sensor and the laser energy meter probe are all arranged in the lens barrel, the inlet concave lens is fixedly arranged in the light inlet of the lens, and the inlet concave lens is fixedly arranged in the rear side of the inlet concave lens, the diaphragm is fixedly arranged right behind the inlet convex lens, the power output end of the diaphragm adjusting mechanism is connected with an adjusting handle of the diaphragm, the fixed polarizer and the rotary polarizer are arranged between the inlet convex lens and the diaphragm, the second partial reflector is fixedly arranged in the light outlet of the lens barrel, the second partial reflector is obliquely arranged, the outlet concave lens is fixedly arranged right in front of the second partial reflector, the outlet convex lens is fixedly arranged right in front of the outlet concave lens, the first partial reflector is fixedly arranged between the diaphragm and the outlet convex lens, the first partial reflector is obliquely arranged, the inlet concave lens, the inlet convex lens, the outlet concave lens and the outlet convex lens have main optical axes which are all coincided on a central line, the axis of a light inlet hole of the diaphragm is also coincided on the central line, the central line passes through the middle parts of the first partial reflector and the second partial reflector, the included angles between the first partial reflector and the second partial reflector and the central line are both 45 degrees, the laser area sensor is positioned in a reflection light path of the first partial reflector, a receiving surface of the laser area sensor is perpendicular to reflection light of the first partial reflector, the laser energy meter probe is positioned in a reflection light path of the second partial reflector, the receiving surface of the laser energy meter probe is perpendicular to the reflection light of the second partial reflector, a focus in front of the inlet concave lens is coincided with a focus in front of the inlet convex lens, a focus in rear of the outlet concave lens is coincided with a focus in rear of the outlet convex lens, the outer diameter of the inlet convex lens is larger than that of the inlet concave lens, the outer diameter of the outlet convex lens is larger than that of the outlet concave lens, the outer diameter of the inlet concave lens is smaller than that of the outlet concave lens, the outer diameter of the outlet convex lens is larger than that of the inlet convex lens, and the outer diameter of the inlet convex lens is smaller than that of the diaphragm; the fixed polarizer and the rotary polarizer are arranged in tandem or in front of each other, and the central line vertically penetrates through the surface centers of the polarizer pieces of the fixed polarizer and the rotary polarizer; the outer diameters of the polarizer of the fixed polarizer and the rotating polarizer are equal or unequal; when the outer diameters of the polarizer pieces of the fixed polarizer and the rotating polarizer are equal, the outer diameter of the inlet convex lens is smaller than or equal to the outer diameters of the polarizer pieces of the fixed polarizer and the rotating polarizer; when the external diameters of the polarizer pieces of the fixed polarizer and the rotating polarizer are not equal, the external diameter of the inlet convex lens is smaller than or equal to the external diameter of the smaller polarizer piece in the polarizer pieces of the fixed polarizer and the rotating polarizer; the control circuit comprises a controller, a first stepping motor driver, a first stepping motor, a second stepping motor driver, a second stepping motor and a laser energy meter gauge head, wherein a first motor control signal output port of the controller is connected with an input port of the first stepping motor driver, an output port of the first stepping motor driver is connected with the first stepping motor, a rotating shaft of the first stepping motor is connected with a power input end of the diaphragm adjusting mechanism, a second motor control signal output port of the controller is connected with an input port of the second stepping motor driver, an output port of the second stepping motor driver is connected with the second stepping motor, a rotating shaft of the second stepping motor is connected with a power input end of the rotating polarizer, a light signal input port of the controller is connected with a signal output port of the laser area sensor, an energy signal input port of the controller is connected with a signal output port of the laser energy meter gauge head, and a signal input port of the gauge head of the laser energy meter is connected with a signal output port of the probe of the laser energy meter.
The fixed polarizer comprises a first circular polarizer and a first lens frame, the first polarizer is mounted in the first lens frame, the center line vertically penetrates through the center of the surface of the first polarizer, and the outer side surface of the first lens frame is fixedly connected with the inner wall of the lens barrel; the rotary polarizer comprises a circular second polarizer, a circular second frame, a circular fixing sleeve and a second bevel gear, the second polarizer is arranged in the second frame, the central line vertically passes through the surface center of the second polarizer, the axes of the second spectacle frame and the fixing sleeve coincide with the central line, the fixing sleeve is sleeved outside the second spectacle frame, the inner diameter of the fixing sleeve is equal to the outer diameter of the second spectacle frame, the fixing sleeve is rotationally connected with the second spectacle frame, the outer side surface of the fixing sleeve is fixedly connected with the inner wall of the lens barrel, the bull wheel of the second bevel gear is a hollow wheel with the same inner diameter as the second spectacle frame, the axis of the bull wheel of the second bevel gear coincides with the central line, the bull wheel of the second bevel gear is connected with one end of the second spectacle frame into a whole, the rotating shaft of the pinion of the second bevel gear is the power input end of the rotating polarizer, and the rotating shaft of the second stepping motor is; the reflectivities of the first partial reflector and the second partial reflector are both less than or equal to 5%.
The outer diameters of the first polarized lens and the second polarized lens are equal, and the first mirror frame is a circular ring-shaped mirror frame; the fixed polarizer and the rotating polarizer are arranged in tandem.
The diaphragm adjusting mechanism comprises a hollow rotating shaft, a shaft sleeve and a first bevel gear, the hollow rotating shaft is horizontally arranged, the axis of the hollow rotating shaft is coincident with the central line, the inner diameter of the hollow rotating shaft is larger than or equal to the maximum inner diameter of the light inlet hole of the diaphragm, the shaft sleeve is sleeved outside the hollow rotating shaft, the outer side surface of the shaft sleeve is fixedly connected with the inner wall of the lens barrel, a connecting rod horizontally extends out of the end surface of one end of the hollow rotating shaft, the connecting rod is the power output end of the diaphragm adjusting mechanism and is fixedly connected with an adjusting handle extending out of the upper part of the outer side surface of the diaphragm, the lower part of the outer side surface of the diaphragm is fixedly connected with the inner wall of the lens barrel, a bull wheel of the first bevel gear is a hollow wheel with the same inner diameter as the hollow rotating shaft, the axis of the bull wheel of the first bevel gear is coincident with the central line, and, the rotating shaft of the small wheel of the first bevel gear is the power input end of the diaphragm adjusting mechanism, and the rotating shaft of the first stepping motor is connected with the rotating shaft of the small wheel of the first bevel gear.
The diaphragm adjusting mechanism is arranged behind the diaphragm, the connecting rod horizontally extends out of the end face of the front end of the hollow rotating shaft, and the bull wheel of the first bevel gear is connected with the rear end of the hollow rotating shaft into a whole.
The control circuit also comprises a touch display screen, and a touch display screen communication port of the controller is connected with the touch display screen; the controller, the touch display screen, the first stepping motor driver and the second stepping motor driver are arranged outside the lens barrel; the controller, the first stepping motor driver and the second stepping motor driver are arranged in a control box outside the lens barrel, and the touch display screen is arranged on the surface of the control box; the first stepping motor is arranged on the outer wall of the lens barrel, and a rotating shaft of the first stepping motor penetrates through the outer wall of the lens barrel and is connected with the power input end of the diaphragm adjusting mechanism; the second stepping motor is arranged on the outer wall of the lens cone, and a rotating shaft of the second stepping motor penetrates through the outer wall of the lens cone to be connected with the power input end of the rotary polarizer.
The touch display screen can be used for displaying and setting the laser energy parameter after attenuation and the cross section parameter after laser expansion/contraction.
The controller is a single chip microcomputer; the laser area sensor is a CCD camera or a laser energy probe; the probe of the laser energy meter is OPhir type PD 10-C; the first stepping motor driver and the second stepping motor driver are ZH422M type of vibrating-closing machine; the first stepping motor and the second stepping motor are ZH20HB30-0410B types of vibrating-combining machines; the gauge head of the laser energy meter is Ophir JUNO type.
The laser area sensor is arranged on the inner upper wall of the lens barrel, and a connecting line between the controller and the laser area sensor penetrates through the upper wall of the lens barrel; the laser energy meter probe is arranged on the inner upper wall of the lens cone, the laser energy meter head is arranged on the outer upper wall of the lens cone, and a connecting line between the laser energy meter head and the laser energy meter probe penetrates through the upper wall of the lens cone.
Or, the controller is a computer, a first stepping motor motion control card and a second stepping motor motion control card are installed on a PCI slot of a computer mainboard, an output port of the first stepping motor motion control card is connected with an input port of a first stepping motor driver, and an output port of the second stepping motor motion control card is connected with an input port of a second stepping motor driver; the controller, the first stepping motor driver and the second stepping motor driver are all arranged outside the lens barrel; the first stepping motor is arranged on the outer wall of the lens barrel, and a rotating shaft of the first stepping motor penetrates through the outer wall of the lens barrel and is connected with the power input end of the diaphragm adjusting mechanism; the second stepping motor is arranged on the outer wall of the lens cone, and a rotating shaft of the second stepping motor penetrates through the outer wall of the lens cone and is connected with the power input end of the rotary polarizer; the laser area sensor is arranged on the inner upper wall of the lens barrel, and a connecting line between the controller and the laser area sensor penetrates through the upper wall of the lens barrel; the laser energy meter probe is arranged on the inner upper wall of the lens cone, the laser energy meter head is arranged on the outer upper wall of the lens cone, and a connecting line between the laser energy meter head and the laser energy meter probe penetrates through the upper wall of the lens cone.
The laser area sensor is a CCD camera or a laser energy probe; the probe of the laser energy meter is OPhir type PD 10-C; the first stepping motor motion control card and the second stepping motor motion control card are MCC400P of YAKOTEC; the first stepping motor driver and the second stepping motor driver are ZH422M type of vibrating-closing machine; the first stepping motor and the second stepping motor are ZH20HB30-0410B types of vibrating-combining machines; the gauge head of the laser energy meter is Ophir JUNO type.
The laser attenuator firstly uses the inlet concave lens and the inlet convex lens to expand laser needing attenuation, reduces energy density of the laser, then uses the fixed polarizer and the rotary polarizer to attenuate the laser, the attenuated laser carries out adjustment of cross section size through the diaphragm, the first partial reflector, the outlet concave lens and the outlet convex lens, and finally the second partial reflector detects energy of the laser to adjust attenuation rate of the laser.
The adjustment process of the laser cross-sectional area is as follows: the beam expanding lens group consisting of the inlet concave lens and the inlet convex lens expands the beam of the laser beam entering from the light inlet and increases the cross section area of the laser beam so as to finely adjust the cross section area of the laser beam, the diaphragm changes the cross section area of the expanded laser beam, a first part of reflectors are used for reflecting part of the laser to the laser area sensor so as to determine the area of the laser beam after passing through the diaphragm and calculate the cross section area of the laser beam at the light outlet by matching with the beam reduction ratio of a rear beam reducing lens group (consisting of the outlet concave lens and the outlet convex lens), and the controller continuously controls the diaphragm adjusting mechanism to enable the cross section area of the laser beam at the light outlet to accord with; the controller controls the diaphragm adjusting mechanism according to the expansion/contraction setting parameters set by a user and the laser beam cross-sectional area data detected by the laser area sensor, so that the size of the light inlet hole of the diaphragm is controlled, and the beam expansion or beam contraction of the laser is realized.
The working principle of the diaphragm adjusting mechanism is as follows: the controller controls the first stepping motor to rotate through the first stepping motor driver, the first stepping motor drives the small wheel of the first bevel gear to rotate when rotating, the small wheel of the first bevel gear drives the large wheel to rotate, so that the hollow rotating shaft is driven to rotate, when rotating, the connecting rod on the hollow rotating shaft does arc motion around the central line, the adjusting handle which drives the diaphragm also does arc motion, and the light inlet hole of the diaphragm becomes large or small.
The laser energy is adjusted as follows: the laser beam adjusted by the cross section area reaches the second part reflector, wherein a part of laser is reflected to the laser energy meter probe, the laser energy meter probe transmits the received signal to the laser energy meter head, the laser energy meter head calculates the laser energy value and then transmits the laser energy value to the controller, the controller compares the laser energy value with the energy value set by the user, if the laser energy value is the same as the energy value set by the user, the existing state of the rotary polarizer is kept, and if the laser energy value is not the same as the energy value set by the user, the state of the rotary polarizer is adjusted according to the difference between the detected laser energy value and the energy value set by the user, so that the laser energy meets the set value.
The working principle of the rotary polarizer is as follows: the controller controls the second stepping motor to rotate through the second stepping motor driver, the second stepping motor drives the small wheel of the second bevel gear to rotate when rotating, the small wheel of the second bevel gear drives the large wheel to rotate again, so that the second spectacle frame is driven to rotate, and when the second spectacle frame rotates, the vibration penetrating direction of the second polarized lens and the vibration penetrating direction included angle of the first polarized lens change, so that the laser is attenuated.
The utility model has the advantages that:
1, the utility model can monitor the energy and the cross-sectional area of the laser beam in real time, and adjust the rotary polarizer and the diaphragm adjusting mechanism at any time according to the monitored result, so that the energy and the cross-sectional area of the laser beam are always stabilized at a set value, and finally stable laser output is obtained; the utility model discloses can adjust in real time as required energy and the cross-sectional area of laser beam automatically, convenient to use is applicable to the laser application occasion in fields such as scientific research, industry very much.
2, the utility model discloses expand the back with the laser beam and attenuate again, owing to expand the beam and reduced the energy density of laser beam, consequently can adopt the fixed polarizer that tolerates energy density lower and the price is also lower and rotate the polarizer and regard as the attenuator, reduced the utility model discloses a manufacturing cost.
3, the utility model expands the beam of the laser beam to finely adjust the cross-sectional area of the laser beam, then changes the cross-sectional area of the expanded laser beam by adopting the diaphragm, and finally contracts the beam; the controller detects the cross-sectional area of the laser beam passing through the diaphragm through the laser area sensor, and changes the size of the light inlet hole of the diaphragm through controlling the diaphragm adjusting mechanism so as to adjust the cross-sectional area of the laser beam; the controller also detects the energy of the laser beam through the probe of the laser energy meter, and adjusts the energy of the laser beam by controlling the rotation angle of the rotary polarizer; the control circuit adopts precision devices such as a controller, a laser area sensor, a laser energy meter probe, a stepping motor and the like in the control process, and is accurate in control and high in precision.
Description of the drawings:
FIG. 1 is a schematic diagram of an automatically adjustable laser attenuator;
FIG. 2 is a schematic diagram of a fixed polarizer;
FIG. 3 is a schematic diagram of the right side view of FIG. 2;
FIG. 4 is a schematic diagram of a rotating polarizer;
FIG. 5 is a schematic diagram of the right side view of the structure of FIG. 4;
FIG. 6 is a left side view of the structure of FIG. 4;
FIG. 7 is a schematic structural diagram of a diaphragm adjusting mechanism;
FIG. 8 is a schematic diagram of the right side view of FIG. 7;
FIG. 9 is a left side view of the structure of FIG. 7;
FIG. 10 is a schematic diagram of the optical path of the automatically adjustable laser attenuator when expanded;
FIG. 11 is a schematic diagram of the beam path of the automatically adjustable laser attenuator during beam reduction;
FIG. 12 is one of the schematic block circuits of the control circuit;
fig. 13 is a second schematic block diagram of the control circuit.
The specific implementation mode is as follows:
the first embodiment is as follows:
referring to fig. 1 to 12, in the drawings, the laser attenuator capable of automatic adjustment includes a lens barrel 1 horizontally arranged, the front end of the lens barrel 1 is an optical inlet 2, the rear end is an optical outlet 3, the laser attenuator capable of automatic adjustment further includes an inlet concave lens 4, an inlet convex lens 5, an outlet concave lens 6, an outlet convex lens 7, a fixed polarizer, a rotary polarizer, a diaphragm 8, a diaphragm adjustment mechanism, a first partial reflector 9, a second partial reflector 41, a laser area sensor 10, a laser energy meter probe 39 and a control circuit, the inlet concave lens 4, the inlet convex lens 5, the outlet concave lens 6, the outlet convex lens 7, the fixed polarizer, the rotary polarizer, the diaphragm 8, the diaphragm adjustment mechanism, the first partial reflector 9, the second partial reflector 41, the laser area sensor 10 and the laser energy meter probe 39 are all mounted in the lens barrel 1, and the laser energy meter probe 39 is mounted in the optical inlet concave lens barrel 1, an inlet convex lens 5 is fixedly arranged right behind an inlet concave lens 4, a diaphragm 8 is fixedly arranged right behind the inlet convex lens 5, a power output end of a diaphragm adjusting mechanism is connected with an adjusting handle 20 of the diaphragm 8, a fixed polarizer and a rotary polarizer are arranged between the inlet convex lens 5 and the diaphragm 8, a second partial reflector 41 is fixedly arranged in a light outlet 3 of the lens barrel 1, the second partial reflector 41 is obliquely arranged, an outlet concave lens 6 is fixedly arranged right in front of the second partial reflector 41, an outlet convex lens 7 is fixedly arranged right in front of the outlet concave lens 6, a first partial reflector 9 is fixedly arranged between the diaphragm 8 and the outlet convex lens 7, the first partial reflector 9 is obliquely arranged, and the main optical axes of the inlet concave lens 4, the inlet convex lens 5, the outlet concave lens 6 and the outlet convex lens 7 are all superposed on a central line OO', the axis of the light inlet hole 22 of the diaphragm 8 is also coincided with the central line OO ', the central line OO ' passes through the middle parts of the first partial reflector 9 and the second partial reflector 41, the included angles between the first partial reflector 9 and the second partial reflector 41 and the central line OO ' are both 45 degrees, the laser area sensor 10 is positioned in the reflection light path of the first partial reflector 9, the receiving surface of the laser area sensor 10 is vertical to the reflection light of the first partial reflector 9, the laser energy meter probe 39 is positioned in the reflection light path of the second partial reflector 41, the receiving surface of the laser energy meter probe 39 is vertical to the reflection light of the second partial reflector 41, the focal point in front of the inlet concave lens 4 is coincided with the focal point in front of the inlet convex lens 5, the focal point behind the outlet concave lens 6 is coincided with the focal point behind the outlet convex lens 7, the outer diameter of the inlet convex lens 5 is larger than the outer diameter of the inlet concave lens 4, the outer diameter of the outlet convex lens 7 is larger than that of the outlet concave lens 6, the outer diameter of the inlet concave lens 4 is smaller than that of the outlet concave lens 6, the outer diameter of the outlet convex lens 7 is equal to that of the inlet convex lens 5, and the outer diameter of the inlet convex lens 5 is smaller than the maximum inner diameter of the light inlet hole 22 of the diaphragm 8; the fixed polarizer and the rotary polarizer are arranged in tandem, and a central line OO' vertically penetrates through the centers of the surfaces of the polarizer of the fixed polarizer and the rotary polarizer; the outer diameters of the polarizer pieces of the fixed polarizer and the rotating polarizer are equal, and the outer diameter of the inlet convex lens 5 is smaller than the outer diameters of the polarizer pieces of the fixed polarizer and the rotating polarizer; the control circuit comprises a controller, a first stepping motor driver, a first stepping motor 11, a second stepping motor driver, a second stepping motor 37 and a laser energy meter gauge head 38, wherein a first motor control signal output port of the controller is connected with an input port of the first stepping motor driver, an output port of the first stepping motor driver is connected with the first stepping motor 11, a rotating shaft of the first stepping motor 11 is connected with a power input end of the diaphragm adjusting mechanism, a second motor control signal output port of the controller is connected with an input port of the second stepping motor driver, an output port of the second stepping motor driver is connected with the second stepping motor 37, a rotating shaft of the second stepping motor 37 is connected with a power input end of the rotating polarizer, a light signal input port of the controller is connected with a signal output port of the laser area sensor 10, an energy signal input port of the controller is connected with a signal output port of the laser energy meter gauge head 38, the signal input port of the laser energy meter head 38 is connected with the signal output port of the laser energy meter probe 39.
The fixed polarizer comprises a first circular polarizer 31 and a first lens frame 30, the first polarizer 31 is mounted in the first lens frame 30, a center line OO' vertically passes through the center of the surface of the first polarizer 31, and the outer side surface of the first lens frame 30 is fixedly connected with the inner wall of the lens barrel 1; the rotary polarizer comprises a circular second polarizer 33, a circular second frame 32, a circular fixing sleeve 34 and a second bevel gear, the second polarizer 33 is mounted in the second frame 32, a central line OO ' vertically passes through the surface center of the second polarizer 33, the axes of the second frame 32 and the fixing sleeve 34 are coincident with the central line OO ', the fixing sleeve 34 is sleeved outside the second frame 32, the inner diameter of the fixing sleeve 34 is equal to the outer diameter of the second frame 32, the fixing sleeve 34 is rotationally connected with the second frame 32, the outer side surface of the fixing sleeve 34 is fixedly connected with the inner wall of the lens barrel 1, a large wheel 35 of the second bevel gear is a hollow wheel with the same inner diameter as the second frame 32, the axis of the large wheel 35 of the second bevel gear is coincident with the central line OO ', the large wheel 35 of the second bevel gear is connected with one end of the second frame 32 into a whole, the rotating shaft of the small wheel 36 of the second bevel gear is the power input end of the rotary polarizer, the rotating shaft of the second stepping motor 37 is connected with the rotating shaft of the small wheel of the second bevel gear 36; the reflectivity of both the first partial mirror 9 and the second partial mirror 41 is equal to 5%.
The first polarizer 31 and the second polarizer 33 have the same outer diameter, and the first frame 30 is a circular frame.
The light inlet hole 22 of the diaphragm 8 is a circular hole, the diaphragm adjusting mechanism is arranged behind the diaphragm 8, the diaphragm adjusting mechanism comprises a hollow rotating shaft 16, a shaft sleeve 15 and a first bevel gear, the hollow rotating shaft 16 is horizontally arranged, the axis of the hollow rotating shaft 16 is coincided with a central line OO', the inner diameter of the hollow rotating shaft 16 is larger than the maximum inner diameter of the light inlet hole 22 of the diaphragm 8, the shaft sleeve 15 is sleeved outside the hollow rotating shaft 16, the outer side surface of the shaft sleeve 15 is fixedly connected with the inner wall of the lens barrel 1, a connecting rod 19 horizontally extends out of the end surface of the front end of the hollow rotating shaft 16, the connecting rod 19 is a power output end of the diaphragm adjusting mechanism, the connecting rod 19 is fixedly connected with an adjusting handle 20 extending out of the upper part of the outer side surface of the diaphragm 8, the lower part of the outer side surface of the diaphragm 6 is fixedly connected with the inner wall of the lens barrel 1, a bull wheel 17 of the first bevel, the bull wheel 17 of the first bevel gear is connected with the rear end of the hollow rotating shaft 16 into a whole, the rotating shaft of the pinion 18 of the first bevel gear is the power input end of the diaphragm adjusting mechanism, and the rotating shaft of the first stepping motor 11 is connected with the rotating shaft of the pinion 18 of the first bevel gear.
The control circuit also comprises a touch display screen, and a touch display screen communication port of the controller is connected with the touch display screen; the controller, the touch display screen, the first stepping motor driver and the second stepping motor driver are all arranged outside the lens barrel 1; the controller, the first stepping motor driver and the second stepping motor driver are arranged in a control box outside the lens barrel 1, and the touch display screen is arranged on the surface of the control box; the first stepping motor 11 is arranged on the outer wall of the lens barrel 1, and a rotating shaft of the first stepping motor 11 penetrates through the outer wall of the lens barrel 1 to be connected with a power input end of the diaphragm adjusting mechanism; the second stepping motor 37 is installed on the outer wall of the lens barrel 1, and the rotating shaft of the second stepping motor 37 penetrates through the outer wall of the lens barrel 1 to be connected with the power input end of the rotary polarizer.
The touch display screen can be used for displaying and setting the laser energy parameter after attenuation and the cross section parameter after laser expansion/contraction.
The controller is a single chip microcomputer; the laser area sensor 10 is a CCD camera; the laser energy meter probe 39 is of the OPhir PD10-C type; the first stepping motor driver and the second stepping motor driver are ZH422M type of vibrating-closing machine; the first stepping motor 11 and the second stepping motor 37 are ZH20HB30-0410B type of vibrating-combining machine; the laser energy meter head 38 is of type JUNO of Ophir.
The laser area sensor 10 is arranged on the inner upper wall of the lens barrel 1, and a connecting line 21 between the controller and the laser area sensor 10 penetrates through the upper wall of the lens barrel 1; the laser energy meter probe 39 is mounted on the inner upper wall of the lens barrel 1, the laser energy meter head 38 is mounted on the outer upper wall of the lens barrel 1, and a connecting line 40 between the laser energy meter head 38 and the laser energy meter probe 39 penetrates through the upper wall of the lens barrel 1.
The laser attenuator firstly expands the beam of laser to be attenuated by using the inlet concave lens 4 and the inlet convex lens 5 to reduce the energy density of the laser, then attenuates the laser by using the fixed polarizer and the rotating polarizer, adjusts the cross section size of the attenuated laser through the diaphragm 8, the first partial reflector 9, the outlet concave lens 6 and the outlet convex lens 7, and finally detects the energy of the laser through the second partial reflector 41 to adjust the attenuation rate of the laser.
The adjustment process of the laser cross-sectional area is as follows: the beam expanding lens group consisting of the inlet concave lens 4 and the inlet convex lens 5 expands the beam of the laser beam entering from the light inlet 2 and increases the cross-sectional area of the laser beam so as to finely adjust the cross-sectional area of the laser beam, the diaphragm 8 changes the cross-sectional area of the expanded laser beam, the first partial reflector 9 reflects part of the laser to the laser area sensor 10 so as to determine the area of the laser beam after passing through the diaphragm 8 and calculate the cross-sectional area of the laser beam at the light outlet 3 by matching with the beam reduction ratio of the beam reducing lens group (consisting of the outlet concave lens 6 and the outlet convex lens 7) behind, and the controller continuously controls the diaphragm adjusting mechanism to enable the cross-sectional area of the laser beam at the light outlet 3 to be in accordance with the preset; the controller controls the diaphragm adjusting mechanism according to the expansion/contraction setting parameters set by the user and the laser beam cross-sectional area data detected by the laser area sensor, so that the size of the light inlet hole 22 of the diaphragm 8 is controlled, and the laser beam is expanded or contracted.
The working principle of the diaphragm adjusting mechanism is as follows: the controller controls the first stepping motor 11 to rotate through the first stepping motor driver, the first stepping motor 11 drives the small wheel 18 of the first bevel gear to rotate when rotating, the small wheel 18 of the first bevel gear drives the large wheel 17 to rotate, so as to drive the hollow rotating shaft 16 to rotate, when the hollow rotating shaft 16 rotates, the connecting rod 19 on the hollow rotating shaft moves in an arc shape around the central line OO', the adjusting handle 20 driving the diaphragm 8 also moves in an arc shape, and therefore the light inlet hole 22 of the diaphragm 8 becomes large or small.
The laser energy is adjusted as follows: the laser beam with the adjusted cross-sectional area reaches the second partial reflector 41, wherein a part of the laser is reflected to the laser energy meter probe 39, the laser energy meter probe 39 transmits the received signal to the laser energy meter head 38, the laser energy meter head 38 calculates the laser energy value and then transmits the laser energy value to the controller, the controller compares the laser energy value with the energy value set by the user, if the laser energy value is the same as the energy value set by the user, the existing state of the rotary polarizer is kept, and if the laser energy value is not the same as the energy value set by the user, the state of the rotary polarizer is adjusted according to the difference between the detected laser energy value and the energy value set by the user, so that the laser energy meets the set value.
The working principle of the rotary polarizer is as follows: the controller controls the second stepping motor 37 to rotate through the second stepping motor driver, the second stepping motor 37 drives the small wheel 36 of the second bevel gear to rotate when rotating, the small wheel 36 of the second bevel gear drives the large wheel 35 to rotate, so that the second spectacle frame 32 is driven to rotate, and when the second spectacle frame 32 rotates, the vibration transmission direction of the second polarized lens 33 and the vibration transmission direction included angle of the first polarized lens 31 change, so that the laser is attenuated.
Example two:
referring to fig. 1 to 11 and 13, the numbers in the figures are the same as those in the first embodiment, the meanings and the working processes are also the same, and the same points are not repeated, except that: the controller is a computer, a touch display screen is not included in a control circuit, a first stepping motor motion control card and a second stepping motor motion control card are installed on a PCI slot of a computer mainboard, an output port of the first stepping motor motion control card is connected with an input port of a first stepping motor driver through a terminal board, and an output port of the second stepping motor motion control card is connected with an input port of a second stepping motor driver through the terminal board; the controller, the first stepping motor driver, and the second stepping motor driver are directly mounted outside the lens barrel 1.
The first stepping motor motion control card and the second stepping motor motion control card are YAKOTEC MCC 400P.
Claims (10)
1. The utility model provides a but automatically regulated's laser attenuator, contains the lens cone of level setting, and the front end of lens cone is into light mouth, and the rear end is out of light mouth, characterized by: the laser energy meter comprises an inlet concave lens, an inlet convex lens, an outlet concave lens, an outlet convex lens, a fixed polarizer, a rotary polarizer, a diaphragm adjusting mechanism, a first partial reflector, a second partial reflector, a laser area sensor, a laser energy meter probe and a control circuit, wherein the inlet concave lens, the inlet convex lens, the outlet concave lens, the outlet convex lens, the fixed polarizer, the rotary polarizer, the diaphragm adjusting mechanism, the first partial reflector, the second partial reflector, the laser area sensor and the laser energy meter probe are all arranged in a lens barrel, the inlet concave lens is fixedly arranged in a light inlet of the lens barrel, the inlet convex lens is fixedly arranged behind the inlet concave lens, the diaphragm is fixedly arranged behind the inlet convex lens, a power output end of the diaphragm adjusting mechanism is connected with an adjusting handle of the diaphragm, the rotary polarizer is fixedly arranged between the inlet convex lens and the diaphragm, the second partial reflector is fixedly arranged in a light outlet of the lens barrel, the second partial reflector is obliquely arranged, the outlet concave lens is fixedly arranged right ahead of the second partial reflector, the outlet convex lens is fixedly arranged right ahead of the outlet concave lens, the first partial reflector is fixedly arranged between the diaphragm and the outlet convex lens, the first partial reflector is obliquely arranged, the main optical axes of the inlet concave lens, the inlet convex lens, the outlet concave lens and the outlet convex lens are all superposed on a central line, the axis of a light inlet of the diaphragm is also superposed on the central line, the central line passes through the middle parts of the first partial reflector and the second partial reflector, the included angles between the first partial reflector and the central line are both 45 degrees, the laser area sensor is positioned in a reflection optical path of the first partial reflector, and a receiving surface of the laser area sensor is perpendicular to the reflection light of the first partial reflector, the laser energy meter probe is positioned in a reflection light path of the second partial reflector, a receiving surface of the laser energy meter probe is perpendicular to reflection light of the second partial reflector, a focus in front of the inlet concave lens is coincided with a focus in front of the inlet convex lens, a focus in rear of the outlet concave lens is coincided with a focus in rear of the outlet convex lens, the outer diameter of the inlet convex lens is larger than that of the inlet concave lens, the outer diameter of the outlet convex lens is larger than that of the outlet concave lens, the outer diameter of the inlet concave lens is smaller than that of the outlet concave lens, the outer diameter of the outlet convex lens is larger than that of the inlet convex lens, and the outer diameter of the inlet convex lens is smaller than the maximum inner diameter of a light inlet hole of the diaphragm; the fixed polarizer and the rotary polarizer are arranged in tandem or in front of each other, and the central line vertically penetrates through the surface centers of the polarizer pieces of the fixed polarizer and the rotary polarizer; the outer diameters of the polarizer of the fixed polarizer and the rotating polarizer are equal or unequal; when the outer diameters of the polarizer pieces of the fixed polarizer and the rotating polarizer are equal, the outer diameter of the inlet convex lens is smaller than or equal to the outer diameters of the polarizer pieces of the fixed polarizer and the rotating polarizer; when the external diameters of the polarizer pieces of the fixed polarizer and the rotating polarizer are not equal, the external diameter of the inlet convex lens is smaller than or equal to the external diameter of the smaller polarizer piece in the polarizer pieces of the fixed polarizer and the rotating polarizer; the control circuit comprises a controller, a first stepping motor driver, a first stepping motor, a second stepping motor driver, a second stepping motor and a laser energy meter gauge head, wherein a first motor control signal output port of the controller is connected with an input port of the first stepping motor driver, an output port of the first stepping motor driver is connected with the first stepping motor, a rotating shaft of the first stepping motor is connected with a power input end of the diaphragm adjusting mechanism, a second motor control signal output port of the controller is connected with an input port of the second stepping motor driver, an output port of the second stepping motor driver is connected with the second stepping motor, a rotating shaft of the second stepping motor is connected with a power input end of the rotating polarizer, a light signal input port of the controller is connected with a signal output port of the laser area sensor, an energy signal input port of the controller is connected with a signal output port of the laser energy meter gauge head, and a signal input port of the gauge head of the laser energy meter is connected with a signal output port of the probe of the laser energy meter.
2. The automatically adjustable laser attenuator of claim 1, wherein: the fixed polarizer comprises a first circular polarizer and a first lens frame, the first polarizer is mounted in the first lens frame, the center line vertically penetrates through the center of the surface of the first polarizer, and the outer side surface of the first lens frame is fixedly connected with the inner wall of the lens barrel; the rotary polarizer comprises a circular second polarizer, a circular second frame, a circular fixing sleeve and a second bevel gear, the second polarizer is arranged in the second frame, the central line vertically passes through the surface center of the second polarizer, the axes of the second spectacle frame and the fixing sleeve coincide with the central line, the fixing sleeve is sleeved outside the second spectacle frame, the inner diameter of the fixing sleeve is equal to the outer diameter of the second spectacle frame, the fixing sleeve is rotationally connected with the second spectacle frame, the outer side surface of the fixing sleeve is fixedly connected with the inner wall of the lens barrel, the bull wheel of the second bevel gear is a hollow wheel with the same inner diameter as the second spectacle frame, the axis of the bull wheel of the second bevel gear coincides with the central line, the bull wheel of the second bevel gear is connected with one end of the second spectacle frame into a whole, the rotating shaft of the pinion of the second bevel gear is the power input end of the rotating polarizer, and the rotating shaft of the second stepping motor is; the reflectivities of the first partial reflector and the second partial reflector are both less than or equal to 5%.
3. The automatically adjustable laser attenuator of claim 2, wherein: the outer diameters of the first polarized lens and the second polarized lens are equal, and the first mirror frame is a circular ring-shaped mirror frame; the fixed polarizer and the rotating polarizer are arranged in tandem.
4. The automatically adjustable laser attenuator of claim 1, wherein: the diaphragm adjusting mechanism comprises a hollow rotating shaft, a shaft sleeve and a first bevel gear, the hollow rotating shaft is horizontally arranged, the axis of the hollow rotating shaft is coincident with the central line, the inner diameter of the hollow rotating shaft is larger than or equal to the maximum inner diameter of the light inlet hole of the diaphragm, the shaft sleeve is sleeved outside the hollow rotating shaft, the outer side surface of the shaft sleeve is fixedly connected with the inner wall of the lens barrel, a connecting rod horizontally extends out of the end surface of one end of the hollow rotating shaft, the connecting rod is the power output end of the diaphragm adjusting mechanism and is fixedly connected with an adjusting handle extending out of the upper part of the outer side surface of the diaphragm, the lower part of the outer side surface of the diaphragm is fixedly connected with the inner wall of the lens barrel, a bull wheel of the first bevel gear is a hollow wheel with the same inner diameter as the hollow rotating shaft, the axis of the bull wheel of the first bevel gear is coincident with the central line, and the, the rotating shaft of the small wheel of the first bevel gear is the power input end of the diaphragm adjusting mechanism, and the rotating shaft of the first stepping motor is connected with the rotating shaft of the small wheel of the first bevel gear.
5. The automatically adjustable laser attenuator of claim 4, wherein: the diaphragm adjusting mechanism is arranged behind the diaphragm, the connecting rod horizontally extends out of the end face of the front end of the hollow rotating shaft, and the bull wheel of the first bevel gear is connected with the rear end of the hollow rotating shaft into a whole.
6. The automatically adjustable laser attenuator of claim 1, wherein: the control circuit also comprises a touch display screen, and a touch display screen communication port of the controller is connected with the touch display screen; the controller, the touch display screen, the first stepping motor driver and the second stepping motor driver are arranged outside the lens barrel; the first stepping motor is arranged on the outer wall of the lens barrel, and a rotating shaft of the first stepping motor penetrates through the outer wall of the lens barrel and is connected with the power input end of the diaphragm adjusting mechanism; the second stepping motor is arranged on the outer wall of the lens cone, and a rotating shaft of the second stepping motor penetrates through the outer wall of the lens cone to be connected with the power input end of the rotary polarizer.
7. The automatically adjustable laser attenuator of claim 6, wherein: the controller is a single chip microcomputer; the laser area sensor is a CCD camera or a laser energy probe; the probe of the laser energy meter is OPhir type PD 10-C; the first stepping motor driver and the second stepping motor driver are ZH422M type of vibrating-closing machine; the first stepping motor and the second stepping motor are ZH20HB30-0410B types of vibrating-combining machines; the gauge head of the laser energy meter is Ophir JUNO type.
8. The automatically adjustable laser attenuator of claim 6, wherein: the laser area sensor is arranged on the inner upper wall of the lens barrel, and a connecting line between the controller and the laser area sensor penetrates through the upper wall of the lens barrel; the laser energy meter probe is arranged on the inner upper wall of the lens cone, the laser energy meter head is arranged on the outer upper wall of the lens cone, and a connecting line between the laser energy meter head and the laser energy meter probe penetrates through the upper wall of the lens cone.
9. The automatically adjustable laser attenuator of claim 1, wherein: the controller is a computer, a first stepping motor motion control card and a second stepping motor motion control card are installed on a PCI slot of a computer mainboard, an output port of the first stepping motor motion control card is connected with an input port of a first stepping motor driver, and an output port of the second stepping motor motion control card is connected with an input port of a second stepping motor driver; the controller, the first stepping motor driver and the second stepping motor driver are all arranged outside the lens barrel; the first stepping motor is arranged on the outer wall of the lens barrel, and a rotating shaft of the first stepping motor penetrates through the outer wall of the lens barrel and is connected with the power input end of the diaphragm adjusting mechanism; the second stepping motor is arranged on the outer wall of the lens cone, and a rotating shaft of the second stepping motor penetrates through the outer wall of the lens cone and is connected with the power input end of the rotary polarizer; the laser area sensor is arranged on the inner upper wall of the lens barrel, and a connecting line between the controller and the laser area sensor penetrates through the upper wall of the lens barrel; the laser energy meter probe is arranged on the inner upper wall of the lens cone, the laser energy meter head is arranged on the outer upper wall of the lens cone, and a connecting line between the laser energy meter head and the laser energy meter probe penetrates through the upper wall of the lens cone.
10. The automatically adjustable laser attenuator of claim 9, wherein: the laser area sensor is a CCD camera or a laser energy probe; the probe of the laser energy meter is OPhir type PD 10-C; the first stepping motor motion control card and the second stepping motor motion control card are MCC400P of YAKOTEC;
the first stepping motor driver and the second stepping motor driver are ZH422M type of vibrating-closing machine; the first stepping motor and the second stepping motor are ZH20HB30-0410B types of vibrating-combining machines; the gauge head of the laser energy meter is Ophir JUNO type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920759967.6U CN209858869U (en) | 2019-05-24 | 2019-05-24 | Laser attenuator capable of being automatically adjusted |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920759967.6U CN209858869U (en) | 2019-05-24 | 2019-05-24 | Laser attenuator capable of being automatically adjusted |
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| CN209858869U true CN209858869U (en) | 2019-12-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007476A (en) * | 2019-05-24 | 2019-07-12 | 平顶山学院 | Self-adjustable laser attenuator assembly |
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2019
- 2019-05-24 CN CN201920759967.6U patent/CN209858869U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007476A (en) * | 2019-05-24 | 2019-07-12 | 平顶山学院 | Self-adjustable laser attenuator assembly |
| CN110007476B (en) * | 2019-05-24 | 2023-09-26 | 平顶山学院 | Automatically adjustable laser attenuator |
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