CN110375644A - A kind of Portable hitting, which is carved characters, accords with the detection device and detection method of depth - Google Patents

Abstract

The invention discloses a portable detection device for the depth of engraved characters, which includes a mechanical shell main body, a clamping mechanism, a roller, a display screen and a laser triangulation optical path unit, and the laser triangulation optical path unit includes an inline laser and a reflector , a lens and an image sensor, an optical filter is arranged between the image sensor and the lens, and the bottom of the main body of the mechanical housing is a glass window. The invention also discloses a method for detecting the depth of an engraved character. First, a trigger signal is generated, then 3D contour data on the character surface is sampled, character feature data represented by the character scanning contour is calculated, and finally the character detection result is displayed. The detection device and detection method of the present invention can conduct non-contact comprehensive detection of the depth or height of engraved characters, the size of characters and the distance between adjacent characters, which can reduce the cost of manual detection in the process of motor vehicle manufacturing and annual inspection, and improve detection accuracy and Improve detection efficiency and solve technical problems that plague the industry.

Description

A portable detection device and detection method for the depth of engraved characters

technical field

The invention relates to the technical field of vehicle manufacturing, in particular to a portable depth detection device and detection method for engraved characters.

Background technique

The traditional motor vehicle VIN code and engine number detection mainly relies on manual visual inspection. Some car companies use a dial gauge with a probe to detect the depth of the VIN code and engine number. Since the tip of the probe has a certain thickness, it cannot detect the depth of the character gully details by itself, and it needs to be pressed manually during use, so there are certain subjective factors in the measurement results. Traditional detection methods have problems such as high labor costs, low efficiency, poor quantification accuracy, subjectivity, and easy omissions. With the increase of car ownership and sales, the workload of motor vehicle manufacturers and vehicle annual inspection agencies to detect VIN codes and engine numbers has also increased rapidly. The traditional mechanical detection method can no longer meet the needs of the market.

Contents of the invention

In order to solve the problems existing in the prior art, the present invention provides a portable detection device and detection method for the depth of engraved characters. The detection device of the present invention has portability. Using the detection method of the present invention, it can detect Depth or height, character size, adjacent character spacing, conduct non-contact comprehensive inspection, improve the work quality of inspectors, and improve work efficiency.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A portable detection device for the depth of engraved characters, comprising a mechanical casing main body, a clamping mechanism arranged on one side of the outer wall of the mechanical casing main body, a roller arranged at the bottom of the mechanical casing main body, a display unit arranged at the top of the mechanical casing main body and Buttons, a laser triangulation optical path unit located inside the main body of the mechanical shell, the display unit includes a display screen and one or more LED status indicators, the display screen is a touch screen, and the buttons are used for system switching and function setting operations. The laser triangulation optical path unit includes two word-line lasers arranged at an angle to each other, a mirror, a lens and an image sensor, the direction of the light path emitted by the word-line laser is vertically downward, and the word-line laser The straight direction of the line laser is perpendicular to the moving direction of the roller, and the reflector is located on the reflected light path of the line laser emitted by the line laser after being reflected by the surface of the object. The image sensor is located on the projected optical path passing through the lens on the reflected light path after the lens, and a filter is arranged between the image sensor and the lens, and the bottom of the main body of the mechanical housing is provided with a line for the laser to pass through. glass window.

The interior of the main body of the mechanical housing is also provided with a microprocessor, the roller is provided with a rotary encoder, the signal output end of the image sensor is connected to the first signal input end of the microprocessor, and the rotary encoder The signal output terminal of the microprocessor is connected to the second signal input terminal of the microprocessor, the first signal output terminal of the microprocessor is connected to the signal input terminal of the word line laser, and the second signal output terminal of the microprocessor is The terminal is connected to the signal input terminal of the display screen.

The detection device for the depth of portable engraved characters of the present invention also includes a communication unit, a power supply unit and a storage device, the communication unit is a network port, bluetooth or serial port communication interface, and the third signal output terminal of the microprocessor is connected to the The signal input end of the communication unit and the signal output end of the communication unit are connected to the signal input end of an external printer or other host, and the character detection result can be sent to the printer or other host through the communication unit.

The power supply unit can support battery power supply and DC power supply at the same time, and the input voltage range of DC power supply is 12V-24V, which supplies power for microprocessor, image sensor, rotary encoder and in-line laser.

The signal input end of the storage is connected to the fourth signal output end of the microprocessor for storing the data of the image sensor and the rotary encoder.

The signal input end of the LED status indicator is connected to the fifth signal output end of the microprocessor, and the rotary encoder generates a trigger signal every time it rotates through a certain angle. When the sampling is not completed, the microprocessor judges that the current trigger signal is invalid, ignores the trigger signal, and at the same time outputs a signal to the LED status indicator for prompting.

The sixth signal output terminal of the microprocessor is connected to the signal input terminal of the image sensor.

The working principle of the present invention is: push the main body of the mechanical shell through the clamping mechanism to make the roller walk along the characters, and install a rotary encoder on the roller to detect the rotation angle of the roller, and the minimum value of the angle measurement resolution is determined by the following formula : Minimum angular resolution: a _min =ΔL/(π*d)*360°, wherein ΔL is the minimum scanning distance, preferably 0.05mm-0.1mm, and d is the diameter of the main wheel. Every time the rotary encoder rotates through a certain angle, a trigger signal is generated to the microprocessor, and the microprocessor judges the validity of the trigger signal. The microprocessor judges that the current trigger signal is invalid, ignores the trigger signal, and at the same time outputs a signal to the LED status indicator for prompting; when the previous frame image sampling has been completed, it judges that the current trigger signal is valid. After the microprocessor receives an effective trigger signal, it will output a start signal to the word line laser, start the word line laser to emit a word line laser, and at the same time, output a start signal to the image sensor, start the image sensor to detect the word line The image signal of laser scanning, the specific optical path structure is: the one-line laser emitted by the one-line laser is incident on the surface of the character, reflected by the surface of the character, enters the mirror, reflects again into the lens, and then projects to the image after passing through the filter sensor, the image sensor outputs the detected image information to the microprocessor, and the microprocessor processes the information. The specific calculation and processing method is as follows: firstly, the polynomial curve fitting algorithm and the RANSAC curve fitting algorithm are used to calculate each contour line The straight line or polynomial curve of the representative geometric surface, and then according to the distance between the points on each contour line and the straight line or polynomial curve corresponding to the contour line, the character recognition algorithm is used to extract the character point cloud data that conforms to the character characteristics, and finally, splicing The character point cloud data extracted from the character scanning outline, and the depth, size and spacing of characters are calculated. Afterwards, the microprocessor outputs the calculated depth, size and spacing information of the characters to the display screen for display, and at the same time outputs it to the memory for storage. The communication unit can also send the character detection results to the printer or other hosts through the communication unit. The detection device of the present invention can conduct non-contact comprehensive detection of the depth or height of engraved characters, character size and the distance between adjacent characters, which can reduce the manual detection cost in the process of motor vehicle manufacturing and annual inspection, improve detection accuracy and detection efficiency, and solve the problem of Technical issues plaguing the industry.

Preferably, the central axis of the word-line laser meets the virtual image of the mirror surface of the reflector, the principal plane of the lens, and the photosensitive plane of the image sensor at one point, satisfying the Scheimpflug condition, and obtaining the maximum imaging depth of field.

Preferably, the included angle between the optical axis of the word-line laser and the reflection optical path of the word-line laser emitted by the word-line laser is reflected from the surface of the object to the reflection mirror is preferably 20°-50°, and the included angle If the value is too small, the measurement resolution of the z-axis will be insufficient; if the z-axis is too large, part of the concave contour will be blocked, which will affect the detection of character details.

Preferably, the one-word-line laser is a semiconductor laser, the line width of the one-word-line laser emitted by the one-word-line laser is 0.03mm-0.1mm, and the length of one wordline is ensured to be greater than the height of the character to be detected.

Preferably, the optical filter is a narrow-band optical filter, and the bandwidth of the optical filter is 10nm-30nm. The narrow-band filter only allows light waves in a small range of wavelengths including the laser wavelength to pass through, and the light waves of other wavelengths are cut off, making the results of scanning detection more accurate.

Preferably, when measuring characters, in order to ensure that the measuring laser moves smoothly relative to the surface of the characters and reduce the influence of skew and vibration on the measurement results, there are three rollers, one of which is the main wheel, and the three rollers are all connected to the The main body of the mechanical housing is detachably connected for easy replacement.

Preferably, the outer wheel material of the main wheel is a material with wear resistance and high rolling friction, such as wear-resistant rubber, which plays an anti-skid role.

Preferably, the clamping mechanism is a handle, and is detachably connected to the main body of the mechanical housing, which can be easily replaced and installed on the robot arm.

Preferably, the roller mechanism is easy to disassemble and replace.

The present invention also provides a method for detecting the depth of engraved characters using the portable engraved character depth detection device of the present invention, the technical solution of which is:

A method for detecting the depth of engraved characters, comprising the following steps:

S1. Receive or generate a trigger signal;

S2, sampling the 3D contour data of the character surface;

S3. Calculating the character feature data represented by the character scan outline;

S4, displaying the character detection result;

S5. Send the character detection result to other devices.

Preferably, step S1 specifically includes the following steps:

S11. A trigger signal is generated every time the rotary encoder rotates through a certain angle;

S12. Judging the validity of the trigger signal. When the previous frame of image sampling is not completed due to excessive speed of the scroll wheel, etc., it is judged that the current trigger signal is invalid, the trigger signal is ignored, and the LED status indicator is lit at the same time for prompting; When a frame of image sampling has been completed, it is judged that the current trigger signal is valid;

S13. Accept an effective trigger signal from the rotary encoder, and send a start signal to the line laser and the image sensor;

S14. Start the one-line laser to emit one-line laser, and at the same time start the image sensor to sample the one-line laser profile image.

Preferably, step S3 specifically includes the following steps:

S31. Calculate the straight line or polynomial curve of the geometric surface represented by each contour line, specifically, polynomial curve fitting algorithm and RANSAC curve fitting algorithm can be used;

S32. According to the distance between the points on each contour line and the straight line or polynomial curve corresponding to the contour line, extract character point cloud data conforming to character features;

S33, splicing the character point cloud data extracted from the character scan outline;

S34. Count the depth, size and spacing of the characters.

Preferably, step S34 specifically includes the following steps:

S341. Using a character recognition algorithm to extract a character area;

S342. Calculate the character size and the spacing between characters according to the circumscribed rectangle of the character.

The beneficial effects of the present invention are:

1. The detection device and detection method of the present invention can not only measure the depth of recessed engraved characters such as engine numbers, but also measure the height of protruding characters, which has a wider application range; and can measure data such as character size and spacing at one time, and at the same time Including character recognition function, the measurement results are more accurate and comprehensive.

2. The one-word-line laser adopts a semiconductor laser, and the line width of the one-word-line laser emitted by the one-word-line laser is 0.03 mm to 0.1 mm, ensuring that the length of the one-word line is greater than the height of the character to be detected.

3. The filter adopts a narrow-band filter, and the bandwidth of the filter is 10nm to 30nm. The narrow-band filter only allows light waves in a small wavelength range including the laser wavelength to pass through, and the light waves of other wavelengths are cut off, reducing the External interference can also be used in strong light environments, making the results of scanning detection more accurate.

4. Both the roller and the holding mechanism are detachably connected to the main body of the mechanical casing, which is convenient for replacement.

5. Portable design, flexible and convenient to use.

6. Support wireless communication, and the test report can be sent directly to the printer, which has a good user experience.

7. In summary, the detection device and detection method of the present invention can conduct non-contact comprehensive detection of the depth or height of engraved characters, character size and the distance between adjacent characters, which can reduce the cost of manual detection in the process of motor vehicle manufacturing and annual inspection , improve the detection accuracy and detection efficiency, and solve the technical problems that plague the industry.

Description of drawings

Fig. 1 is the structural schematic diagram of the detection device of portable engraved character depth described in the embodiment of the present invention;

2 is a schematic diagram of the optical path structure of the laser triangulation optical path unit described in the embodiment of the present invention;

3 is a perspective view of a portable detection device for engraved character depth according to an embodiment of the present invention;

Fig. 4 is the schematic diagram when the detection device of portable engraved character depth described in the embodiment of the present invention detects;

Fig. 5 is the control principle block diagram of the embodiment of the present invention;

Fig. 6 is a flowchart one of the detection method for the depth of engraved characters according to the embodiment of the present invention;

FIG. 7 is a flowchart of receiving or generating a trigger signal according to an embodiment of the present invention;

FIG. 8 is a flow chart of calculating the character feature data represented by the character scanning contour line according to the embodiment of the present invention;

Fig. 9 is a flow chart of counting the depth, size and spacing of characters according to an embodiment of the present invention;

FIG. 10 is the second flow chart of the method for detecting the depth of engraved characters according to the embodiment of the present invention.

Explanation of reference signs:

101. Main body of mechanical housing; 102. Clamping mechanism; 103. Roller; 104. Display screen; 105. LED status indicator; 106. Button; 107. Inline laser; 108. Reflector; Image sensor; 111, optical filter; 112, rotary encoder; 113, communication unit; 114, power supply unit; 115, memory; 116, microprocessor;

L1, the optical path of the straight-line laser; L2, the projection direction of the straight-line laser; L3, the laser contour line projected on the surface of the object; 201, the virtual image of the optical axis of the laser relative to the mirror; 202, the direction of the main plane of the lens; 203. The direction of the photosensitive surface of the image sensor; 204. The surface of the engraved characters.

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Example:

As shown in Figures 1 to 5, a portable detection device for the depth of engraved characters includes a mechanical housing main body 101, a clamping mechanism 102 arranged on one side of the mechanical housing main body 101, and a clamping mechanism 102 located at the bottom of the mechanical housing main body 101. The scroll wheel 103, the display unit and buttons 106 arranged on the top of the mechanical housing main body 101, the laser triangulation optical path unit located inside the mechanical housing main body 101, the display unit includes a display screen 104 and one or more LED status indicators 105, showing The screen 104 is a touch display screen 104, and the buttons 106 are used for the operation of the system on and off and function settings. The laser triangulation optical path unit includes two line lasers 107, reflectors 108, and lenses 109 arranged at an angle to each other. And the image sensor 110, the light path direction emitted by the word-line laser 107 is vertically downward, and the word-line direction of the word-line laser 107 is perpendicular to the moving direction of the roller 103, and the reflector 108 The mirror surface is located on the reflection optical path of the one-word-line laser light emitted by the one-word-line laser 107 after being reflected by the surface of the object, the lens 109 is located on the reflection optical path after being reflected by the mirror 108, and the image sensor 110 is arranged on the On the projection optical path of the lens 109, a filter 111 is provided between the image sensor 110 and the lens 109, and a glass window is provided at the bottom of the main body of the mechanical housing 101 for a line laser to pass through.

The interior of the mechanical housing main body 101 is also provided with a microprocessor 116, the roller 103 is provided with a rotary encoder 112, and the signal output end of the image sensor 110 is connected to the first signal input end of the microprocessor 116 , the signal output end of the rotary encoder 112 is connected to the second signal input end of the microprocessor 116, and the first signal output end of the microprocessor 116 is connected to the signal input end of the word line laser 107, The second signal output end of the microprocessor 116 is connected to the signal input end of the display screen 104 .

The detection device of portable engraving character depth of the present invention also comprises communication unit 113, power supply unit 114 and memory 115, and described communication unit 113 is network port, bluetooth or serial port communication interface, and the 3rd signal of described microprocessor 116 The output end is connected to the signal input end of the communication unit 113, and the signal output end of the communication unit 113 is connected to the signal input end of an external printer or other host, and the character detection result can be sent to the printer or other host through the communication unit 113.

The power supply unit 114 can support battery power supply and DC power supply at the same time, wherein the input voltage range of the DC power supply is 12V-24V, and supplies power for the microprocessor 116 , the image sensor 110 , the rotary encoder 112 and the word-line laser 107 .

The signal input end of the storage 115 is connected to the fourth signal output end of the microprocessor 116 for storing the data of the image sensor 110 and the rotary encoder 112 .

The signal input end of the LED status indicator light 105 is connected to the fifth signal output end of the microprocessor 116, and the rotary encoder 112 generates a trigger signal every time it turns over a certain angle. When the image sampling of the last frame is not completed, the microprocessor 116 judges that the current trigger signal is invalid, ignores the trigger signal, and simultaneously outputs a signal to the LED status indicator 105 for prompting.

The sixth signal output end of the microprocessor 116 is connected to the signal input end of the image sensor 110 .

The rollers 103 are provided with three, the main wheel at the rear end (or the main wheel at the front end), and the three rollers 103 are detachably connected with the main body 101 of the mechanical housing, which can be easily replaced.

The material of the outer wheel of the main wheel is a material with high wear resistance and high rolling friction, such as wear-resistant rubber, which plays the role of anti-skid.

The clamping mechanism 102 is a handle, and is detachably connected with the mechanical housing main body 101 for easy replacement.

The working principle of the present invention is: push the main body 101 of the mechanical casing through the clamping mechanism 102, make the roller 103 walk along the characters, set a rotary encoder 112 on the roller 103, and use it to detect the rotation angle of the roller 103, and its angle measurement resolution is The minimum value is determined by the following formula: Minimum angular resolution: a _min = ΔL/(π*d)*360°, where ΔL is the minimum scanning distance, preferably 0.05mm-0.1mm, and d is the diameter of the main wheel. Every time the rotary encoder 112 rotates through a certain angle, a trigger signal is generated to the microprocessor 116, and the microprocessor 116 judges the validity of the trigger signal, specifically: when the last frame of image sampling is caused by reasons such as the excessive speed of the roller 103 When it is not completed, the microprocessor 116 judges that the current trigger signal is invalid, ignores the trigger signal, and outputs a signal to the LED status indicator 105 to prompt; when the previous frame image sampling has been completed, it judges that the current trigger signal is valid. After the microprocessor 116 receives an effective trigger signal, it will output a start signal to the word line laser 107, start the word line laser 107 to emit a word line laser, and at the same time, output a start signal to the image sensor 110, start the image sensor 110 detects the image signal of one-word-line laser scanning, and the specific optical path structure is: the one-word-line laser light emitted by one-word-line laser 107 is incident on the character surface, enters the reflector 108 after being reflected by the character surface, reflects again and enters the lens 109, and then After passing through the optical filter 111, it is projected onto the image sensor 110, and the image sensor 110 outputs the detected image information to the microprocessor 116, and the microprocessor 116 processes the information. The combination algorithm and RANSAC curve fitting algorithm calculate the straight line or polynomial curve of the geometric surface represented by each contour line, and then use the character recognition algorithm according to the distance from the point on each contour line to the straight line or polynomial curve corresponding to the contour line, Extract the character point cloud data that conforms to the character characteristics, and finally, stitch the character point cloud data extracted from the character scan outline to calculate the depth, size and spacing of the characters. Afterwards, the microprocessor 116 outputs the information on the depth, size and spacing of the calculated characters to the display screen 104 for display, and at the same time outputs to the storage device 115 for storage. The communication unit 113 can also send the character detection results to printer or other host. The detection device of the present invention can conduct non-contact comprehensive detection of the depth or height of engraved characters, character size and the distance between adjacent characters, which can reduce the manual detection cost in the process of motor vehicle manufacturing and annual inspection, improve detection accuracy and detection efficiency, and solve the problem of Technical issues plaguing the industry.

In one of the embodiments, as shown in FIG. 2 , the central axis of the word line laser 107 is relative to the virtual image of the mirror surface of the reflector 108, the main plane of the lens 109, the image sensor 110 The photosensitive planes meet at a point.

In one of the embodiments, as shown in FIG. 2 , between the optical axis of the word-line laser 107 and the reflection optical path of the word-line laser emitted by the word-line laser 107 reflected from the surface of the object to the reflection mirror 108 The included angle A is 20°～50°.

In one of the embodiments, the word-line laser 107 is a semiconductor laser, and the line width of the word-line laser emitted by the word-line laser 107 is 0.03 mm to 0.1 mm, ensuring that the length of a word line is longer than that to be detected. The height of the characters.

In one of the embodiments, the optical filter 111 is a narrow-band optical filter 111, and the bandwidth of the optical filter 111 is 10nm-30nm. The narrow-band filter 111 only allows light waves in a small range of wavelengths including the laser wavelength to pass through, and light waves with other wavelengths are cut off, so that the result of scanning detection is more accurate.

As shown in Figure 6, a kind of detection method of engraved character depth comprises the following steps:

S1. Receive or generate a trigger signal;

S2, sampling the 3D contour data of the character surface;

S3. Calculating the character feature data represented by the character scan outline;

S4, displaying the character detection result;

S5. Send the character detection result to other devices.

In one of the embodiments, as shown in FIG. 7, step S1 specifically includes the following steps:

S11, generating a trigger signal every time the rotary encoder 112 rotates through a certain angle;

S12, the trigger signal validity judgment, when the last frame of image sampling is not completed due to reasons such as excessive speed of the roller 103, it is judged that the current trigger signal is invalid, the trigger signal is ignored, and the LED status indicator light 105 is lit simultaneously for prompting; When the image sampling of the previous frame has been completed, it is judged that the current trigger signal is valid;

S13. Accept the effective trigger signal from the rotary encoder 112, and send a start signal to the word line laser 107 and the image sensor 110;

S14. Start the one-word-line laser 107 to emit one-word-line laser light, and at the same time start the image sensor 110 to sample the one-word-line laser profile image.

In one of the embodiments, as shown in FIG. 8, step S3 specifically includes the following steps:

S31. Calculate the straight line or polynomial curve of the geometric surface represented by each contour line, specifically, polynomial curve fitting algorithm and RANSAC curve fitting algorithm can be used;

S32. According to the distance between the points on each contour line and the straight line or polynomial curve corresponding to the contour line, extract character point cloud data conforming to character features;

S33, splicing the character point cloud data extracted from the character scan outline;

S34. Count the depth, size and spacing of the characters.

In one of the embodiments, as shown in FIG. 9, step S34 specifically includes the following steps:

S341. Using a character recognition algorithm to extract a character area;

S342. Calculate the character size and the spacing between characters according to the circumscribed rectangle of the character.

In one of the embodiments, as shown in Figure 10, a method for detecting the depth of engraved characters comprises the following steps:

S101, press start, and move the roller 103;

S102, the rotary encoder 112 synchronized with the roller 103 sends trigger signals at equal intervals;

S103, judging whether the trigger signal from the outside is invalid, if when the last frame of image sampling is not completed, then ignore the current trigger signal, and light the LED status indicator 105, prompting that the trigger signal is invalid or the speed of the roller 103 is too fast; if trigger If the signal is valid, enter step S104;

S104, emitting laser light and sampling character outlines;

S105. Extract the character point cloud data represented by the current outline, and display the splicing progress of the character point cloud by the display screen 104 interface;

S106, calculating the start and end flags of characters;

S107, judging whether the detected characters are finished, if finished, then enter step S108; if not finished, then wait for the next trigger signal;

S108. Calculate the character's engraving depth or height, size and distance from the previous character, and display the character size calculation and recognition results on the display screen 104 interface.

The above-mentioned embodiments only express the specific implementation manner of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (9)

1. a kind of Portable hitting, which is carved characters, accords with the detection device of depth, which is characterized in that including mechanical cover main body, be set to outside mechanical Clamping device on the side outer wall of shell main body, set on mechanical cover bottom part body idler wheel, be set to mechanical cover body top Display screen and laser triangulation optical path unit set on mechanical cover body interior, the laser triangulation optical path unit A wordline laser device, reflecting mirror, camera lens and imaging sensor including two two settings angled therebetween, a wordline laser device institute Straight down, and a word direction of a wordline laser device is vertical with the direction of motion of the idler wheel for the optical path direction of transmitting, The reflecting mirror is located at a wordline laser of a wordline laser device transmitting on the reflected light path after body surface reflects, institute It states camera lens to be located on the reflected light path after reflecting mirror reflects, described image sensor is set to the projecting light path by the camera lens On, optical filter is equipped between described image sensor and camera lens, the bottom of the mechanical cover main body is equipped with glass window；

The inside of the mechanical cover main body is additionally provided with microprocessor, and the idler wheel is equipped with rotary encoder, and described image passes The signal output end of sensor connects the first signal input part of the microprocessor, and the signal output end of the rotary encoder connects The second signal input terminal of the microprocessor is connect, the first signal output end of the microprocessor connects a wordline laser The signal input part of device, the second signal output end of the microprocessor connect the signal input part of the display screen.

2. Portable hitting according to claim 1, which is carved characters, accords with the detection device of depth, which is characterized in that a wordline swashs The central axis at the place of light device is passed relative to the virtual image of the mirror surface of the reflecting mirror, the principal plane of the camera lens, described image The sensitized lithography of sensor is intersected in a bit.

3. Portable hitting according to claim 2, which is carved characters, accords with the detection device of depth, which is characterized in that a wordline swashs The a wordline laser of optical axis and a wordline laser the device transmitting of light device is reflected into the reflected light path of the reflecting mirror through body surface Between angle be 20 °~50 °.

4. Portable hitting according to claim 3, which is carved characters, accords with the detection device of depth, which is characterized in that a wordline swashs Light device is semiconductor laser, and the line width of a wordline laser of a wordline laser device transmitting is 0.03mm~0.1mm.

5. Portable hitting according to claim 1, which is carved characters, accords with the detection device of depth, which is characterized in that the Portable hitting is carved The detection device of character depth further includes communication unit, the communication unit be network interface, bluetooth or serial communication interface, it is described micro- The third signal output end of processor connects the signal input part of the communication unit.

6. it is a kind of beat to carve characters accord with the detection method of depth, which comprises the following steps:

S1, reception generate trigger signal；

S2, the 3D outline data for sampling character surface；

The character feature data that S3, calculating character scan wheel profile represent；

S4, display character machining result.

7. it is according to claim 6 beat to carve characters accord with the detection method of depth, which is characterized in that step S1 specifically includes following Step:

S11, rotary encoder often turn over certain angle, generate a trigger signal；

S12, trigger signal Effective judgement, when previous frame image sampling do not complete when, judge current trigger signal be it is invalid, suddenly The slightly trigger signal；When previous frame image sampling is completed, judge that current trigger signal is effective；

S13, receive effective trigger signal that rotary encoder transmits, and issue starting to a wordline laser device and imaging sensor Signal；

S14, starting a wordline laser device emit a wordline laser, while starting imaging sensor to a wordline laser contour images Sampling.

8. it is according to claim 6 beat to carve characters accord with the detection method of depth, which is characterized in that step S3 specifically includes following Step:

S31, the geometry table that the representative of each contour line is calculated using polynomial curve fitting algorithm and RANSAC curve fitting algorithm The straight line or polynomial curve in face；

S32, according to the point on each contour line to the distance of the corresponding straight line of the contour line or polynomial curve, extract matching word Accord with the character point cloud data of feature；

S33, the character point cloud data for splicing character scan contour line extraction；

S34, depth, size and the spacing for counting character.

9. it is according to claim 8 beat to carve characters accord with the detection method of depth, which is characterized in that step S34 specifically include with Lower step:

S341, using character recognition algorithm, extract character zone；

S342, according to the boundary rectangle calculating character size of character and the spacing of intercharacter.