CN214666649U - Laser diffraction diameter measuring instrument - Google Patents
Laser diffraction diameter measuring instrument Download PDFInfo
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- CN214666649U CN214666649U CN202121041550.XU CN202121041550U CN214666649U CN 214666649 U CN214666649 U CN 214666649U CN 202121041550 U CN202121041550 U CN 202121041550U CN 214666649 U CN214666649 U CN 214666649U
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Abstract
The utility model particularly relates to a laser diffraction diameter measuring instrument, including the diameter measuring instrument shell, and the laser diode who sends laser that sets gradually in its diameter measuring instrument shell, the speculum A with laser diode's photorefractive, become the light of speculum convex lens A of parallel light, the convex lens B that will gather once more through the light after the measurement area territory, the speculum B that carries out the secondary refraction to the light, the image sensor who takes out the diffraction stripe image of speculum B refraction, and the signal processing board of the external diameter value of analyzing and calculating the measured object is carried out to the interval of diffraction stripe. The semiconductor laser emits laser, the laser light is changed into parallel light through the convex lens, the parallel light passes through the measuring area, when a measured object exists in the measuring area, diffraction stripes are generated on the edge of the measuring area, an image of the diffraction stripes is taken out through the image sensor, the distance between the diffraction stripes is analyzed, and the outer diameter value of the measured object is calculated.
Description
Technical Field
The utility model belongs to laser measuring equipment field, concretely relates to laser diffraction diameter gauge improves.
Background
The existing laser diameter measuring instrument emits laser beams by a semiconductor laser, drives an octaprism to rotate at a high speed through a motor, scans the laser beams, converts the laser beams into parallel light through an octagon mirror, and passes through a test area; and the parallel light without the shielding of the measured object is converted into high level, and the outer diameter value of the measured object in the laser beam scanning direction can be calculated by calculating the scanning time of the low level.
However, the existing laser diameter measuring instrument has the following problems:
1. a motor rotating at a high speed is arranged in the traditional diameter measuring instrument.
a) When the motor rotates at a non-uniform speed, the measurement result of the diameter is slightly influenced;
b) the service life of the motor is also a factor, the service life of the motor is shortened under the high-speed operation, the motor is replaced at the later stage, and the maintenance cost is increased;
c) the noise of the motor is too obvious in the quiet environment such as a laboratory;
d) the large size of the motor results in an oversize structure of the caliper and the inability to miniaturize (mainly thickness) the caliper.
2. The traditional diameter measuring instrument has uncertainty in measuring the superfine wire below 0.03 mm, and the measurement uncertainty occurs because the diameter of the light beam emitted by the laser is 0.3 mm, which is much larger than the diameter of the superfine wire, so that the low level time is shorter than the actual time.
3. After the diameter measuring instrument is miniaturized, a part of external equipment functions (key functions, communication functions and the like) can be lost or the diameter measuring instrument is changed into a split type (a measuring head is separated from a controller).
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a laser diffraction diameter gauge can the silence operation work, and thickness reduces can easy to assemble.
In order to realize the purpose of the utility model, the utility model adopts the technical proposal that: a laser diffraction diameter measuring instrument comprises a diameter measuring instrument shell, a laser diode, a reflector A, a convex lens B, a reflector B and an image sensor, wherein the laser diode is arranged in the diameter measuring instrument shell in sequence and emits laser, the reflector A refracts light of the laser diode, the convex lens A changes light of the reflector into parallel light, the convex lens B gathers the light passing through a measuring area again, the reflector B refracts the light for the second time, the image sensor takes out diffraction stripe images refracted by the reflector B, and the signal processing board analyzes the distance of the diffraction stripes and calculates the outer diameter value of a measured object.
Preferably: the caliper shell is in a concave shape, the measuring area of the caliper shell is a concave part in the middle, two sides of the concave part are respectively provided with a dust cover which correspondingly protects the convex lens A and the convex lens B, and the middle of the dust cover is provided with a through hole for laser to pass through.
Preferably: the dust cover is magnetic dust cover, and be magnetism dust cover A and magnetism dust cover B respectively, adsorbs on the shell of calliper depressed part through magnet, and magnetism dust cover A sets up in the one side that is close to convex lens A, and magnetism dust cover B sets up in one side of convex lens B, and the through-hole of magnetism dust cover A and magnetism dust cover B corresponds with convex lens A and convex lens B's position.
Preferably: the front surface of the caliper shell is provided with a liquid crystal display and a setting keyboard for setting parameters, and the liquid crystal display and the setting keyboard are connected with the signal processing board.
Preferably: the side surface of the caliper shell is provided with an external display interface and a power supply interface, and the external display interface is connected with a power supply interface signal processing board.
Preferably: the diameter measuring instrument shell is in a concave shape, the bottom of the diameter measuring instrument shell is provided with a guide wheel mounting hole, the other side of the diameter measuring instrument shell, which is opposite to the external display interface, is provided with a side face mounting hole, and the bottom of the diameter measuring instrument shell is provided with a bottom plate mounting hole.
The utility model discloses following beneficial effect has: the semiconductor laser emits laser, the laser light is changed into parallel light through the convex lens, the parallel light passes through the measuring area, when a measured object exists in the measuring area, diffraction stripes are generated on the edge of the measuring area, an image of the diffraction stripes is taken out through the image sensor, the distance between the diffraction stripes is analyzed, and the outer diameter value of the measured object is calculated.
Drawings
Fig. 1 is a schematic view of the internal structure of the present invention;
fig. 2 is a schematic external structural view of the present invention;
fig. 3 is a schematic diagram of the external rear structure of the present invention.
1. A liquid crystal display; 3. a guide wheel mounting hole; 4. setting a keyboard; 5. an external display interface; 6. a power supply interface; 7. a side mounting hole; 8. a bottom plate mounting hole; 9. a laser diode; 10. a reflector A; 11. a convex lens A; 12. a magnetic dust cover A; 13. a magnetic dust cover B; 14. a convex lens B; 15. a mirror B; 16. an image sensor; 17. and a signal processing board.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, 2 and 3, a laser diffraction caliper includes a caliper housing, a laser diode 9 emitting laser light, a mirror a10 refracting the light of the laser diode 9, a convex lens a11 changing the light of the mirror into parallel light, a convex lens B14 re-condensing the light passing through a measurement area, a mirror B15 secondarily refracting the light, an image sensor 16 taking out a diffraction fringe image refracted by the mirror B15, and a signal processing board 17 analyzing the pitch of the diffraction fringes and calculating an outer diameter value of a measured object, which are sequentially disposed in the caliper housing.
Preferably: the caliper shell is in a concave shape, the measuring area of the caliper shell is a concave part in the middle, two sides of the concave part are respectively provided with a dust cover which correspondingly protects the convex lens A11 and the convex lens B14, and the middle of the dust cover is provided with a through hole for laser to pass through.
Preferably: the dustproof covers are magnetic dustproof covers which are respectively a magnetic dustproof cover A12 and a magnetic dustproof cover B13, the dustproof covers are adsorbed on the outer shell of the concave part of the diameter measuring instrument through magnets, the magnetic dustproof cover A12 is arranged on one side close to the convex lens A11, the magnetic dustproof cover B13 is arranged on one side of the convex lens B14, and through holes of the magnetic dustproof cover A12 and the magnetic dustproof cover B13 correspond to the positions of the convex lens A11 and the convex lens B14.
Preferably: the front of the caliper shell is provided with a liquid crystal display 1 and a setting keyboard 4 for setting parameters, and the liquid crystal display 1 and the setting keyboard 4 are connected with a signal processing board 17. The liquid crystal display 1 can display the measured data in real time, and the setting keyboard 4 can be set according to the measured object.
Preferably: the side surface of the shell of the diameter gauge is provided with an external display interface 5 and a power supply interface 6, and the external display interface 5 is connected with a signal processing board 17 of the power supply interface 6. The external display interface 5 can be connected with an external display device, and the power supply interface 6 is connected with an external power supply to supply power to the equipment.
Preferably: the diameter measuring instrument shell is concave, the bottom of the diameter measuring instrument shell is provided with a guide wheel mounting hole 3, the other side of the diameter measuring instrument shell, which is opposite to the external display interface 5, is provided with a side mounting hole 7, and the bottom of the diameter measuring instrument shell is provided with a bottom plate mounting hole 8. The guide wheel mounting hole 3 is used for mounting a guide wheel for a measured object to stably pass through; the side mounting holes 7 and the bottom plate mounting holes 8 are used for fixing the whole diameter measuring instrument.
The utility model discloses following beneficial effect has: the semiconductor laser emits laser, the laser light is changed into parallel light through the convex lens, the parallel light passes through the measuring area, when a measured object exists in the measuring area, diffraction stripes are generated on the edge of the measuring area, an image of the diffraction stripes is taken out through the image sensor 16, the distance between the diffraction stripes is analyzed, and the outer diameter value of the measured object is calculated.
The laser light is emitted from the laser diode, changed into parallel light by the convex lens a11, passes through the measurement region, passes through the convex lens B14 to the mirror B15, and is received by the image sensor 16 and transmitted to the signal processing board 17. When the measured object exists in the measuring area, diffraction fringes can be generated at the edge of the measuring area, images of the diffraction fringes are taken out through the image sensor 16, the intervals of the diffraction fringes are analyzed, and the outer diameter value of the measured object is calculated.
The method can be used for measuring the superfine wire below 0.03 mm with high precision; the size is small (thickness), when the device is installed on site, the gap width for installing the diameter measuring instrument is very small on a production line used by a client, so that the traditional diameter measuring instrument cannot be installed, the diameter measuring instrument needs to be compressed on the thickness, and the size of the motor becomes the largest obstacle; therefore, no moving part is arranged in the instrument, the instrument is silent, the service life of the instrument is longer, and the maintenance cost is low.
The advantages of the application are that:
1. in the same frame of image, there are several fringes, so that one image is divided into several diameter measurement data, and these results are arithmetically averaged to make the single measurement more accurate.
2. According to the diffraction principle, the diffraction fringes are clearer when the diameter is smaller, so that the method has the advantage of measuring superfine lines.
3. And a special light path system enables each laser diffraction diameter measuring instrument to have the same measurement linearity.
Instrument interchange had no effect.
4. The image sensor 16, the laser diode 9 and the liquid crystal display 1 are small in size, thin in thickness and non-moving electronic devices, so that the thickness of the instrument is greatly reduced.
5. The unique optical system ensures that the diffraction fringes are not influenced by incident light and other natural light, and the imaging graph of the diffraction effect is very clear.
6. The wavelength of the laser generated by the laser diode 9 increases with the temperature, and the wavelength lengthening influences the measurement result due to the diffraction principle, so a special wavelength adaptation algorithm is designed, the measurement result is not influenced by the ambient temperature, and the measurement result is consistent all the time.
7. The design of the magnetic dust cover ensures that the dust cover is easy and simple to mount and dismount and greatly reduces the adsorption of dust and oil smoke on the optical lens.
The temperature is 5-55 ℃, the measurement result is stable and is not more than 0.2 um; the method can accurately measure the superfine line of 0.01 mm, has data repeatability and stability of not more than 0.2 um.
The instrument is of an integrated structure, and is light and thin in structure, small in size and rich in functions.
The LCD device 1 has 2 inches, and can display multiple rows of data and characters.
The system has 4 key operation systems, and can input passwords, set communication parameters, instrument system parameters and alarm parameters.
The design of 2 RS485 communication ports is provided, and the data can be conveniently read by a user in a remote way.
The system has 1-path relay alarm output and monitors on-line measurement.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A laser diffraction diameter gauge is characterized in that: the device comprises a caliper shell, a laser diode which is arranged in the caliper shell in sequence and emits laser, a reflector A which refracts light of the laser diode, a convex lens A which changes light of the reflector into parallel light, a convex lens B which gathers light passing through a measuring area again, a reflector B which refracts light for the second time, an image sensor which takes out diffraction stripe images refracted by the reflector B, and a signal processing board which analyzes the distance of the diffraction stripes and calculates the outer diameter value of a measured object.
2. The laser diffraction caliper of claim 1, wherein: the caliper shell is in a concave shape, the measuring area of the caliper shell is a concave part in the middle, two sides of the concave part are respectively provided with a dust cover which correspondingly protects the convex lens A and the convex lens B, and the middle of the dust cover is provided with a through hole for laser to pass through.
3. The laser diffraction caliper of claim 2, wherein: the dust cover is magnetic dust cover, and be magnetism dust cover A and magnetism dust cover B respectively, adsorbs on the shell of calliper depressed part through magnet, and magnetism dust cover A sets up in the one side that is close to convex lens A, and magnetism dust cover B sets up in one side of convex lens B, and magnetism dust cover A and magnetism dust cover B's through-hole corresponds with convex lens A and convex lens B's position.
4. The laser diffraction caliper of claim 3, wherein: the front surface of the caliper shell is provided with a liquid crystal display and a setting keyboard for setting parameters, and the liquid crystal display and the setting keyboard are connected with the signal processing board.
5. The laser diffraction caliper of claim 4, wherein: the side surface of the caliper shell is provided with an external display interface and a power supply interface, and the external display interface is connected with a power supply interface signal processing board.
6. The laser diffraction caliper of claim 5, wherein: the diameter measuring instrument shell is in a concave shape, the bottom of the diameter measuring instrument shell is provided with a guide wheel mounting hole, the other side of the diameter measuring instrument shell, which is opposite to the external display interface, is provided with a side face mounting hole, and the bottom of the diameter measuring instrument shell is provided with a bottom plate mounting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121041550.XU CN214666649U (en) | 2021-05-17 | 2021-05-17 | Laser diffraction diameter measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121041550.XU CN214666649U (en) | 2021-05-17 | 2021-05-17 | Laser diffraction diameter measuring instrument |
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| CN214666649U true CN214666649U (en) | 2021-11-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112902852A (en) * | 2021-01-25 | 2021-06-04 | 上海兰宝传感科技股份有限公司 | Device and method for detecting size of micro object |
| US11415500B2 (en) * | 2018-09-12 | 2022-08-16 | National Institute Of Advanced Industrial Science And Technology | Particulate observation device and particulate observation method |
-
2021
- 2021-05-17 CN CN202121041550.XU patent/CN214666649U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11415500B2 (en) * | 2018-09-12 | 2022-08-16 | National Institute Of Advanced Industrial Science And Technology | Particulate observation device and particulate observation method |
| CN112902852A (en) * | 2021-01-25 | 2021-06-04 | 上海兰宝传感科技股份有限公司 | Device and method for detecting size of micro object |
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