CN112312103A - Laser projection feedback adjustment system and method and vehicle - Google Patents
Laser projection feedback adjustment system and method and vehicle Download PDFInfo
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- 238000001514 detection method Methods 0.000 claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims abstract description 23
- 238000003384 imaging method Methods 0.000 claims abstract description 19
- 230000009123 feedback regulation Effects 0.000 claims abstract description 5
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- 230000010287 polarization Effects 0.000 description 11
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3191—Testing thereof
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Abstract
The invention relates to safe use of laser and discloses a laser projection feedback regulation system which comprises a control unit, a laser light source, a scanning imaging unit, a detection unit and a light splitting unit, wherein the control unit is used for controlling the laser light source to emit light; the light splitting unit is used for splitting laser emitted by the laser light source into a first laser branch and a second laser branch with a fixed power ratio; the scanning imaging unit is arranged on the first laser branch path so as to form a projection pattern and project the projection pattern on the ground; the detection unit is arranged on the second laser branch and used for detecting the optical power P of the second laser branchMeasuring(ii) a The control unit is adapted to be dependent on PMeasuringCalculating the total laser power P emitted by the laser sourceGeneral assemblyAnd by comparing PGeneral assemblyPreset light-emitting power P with laser light source0Determines whether to adjust the input current I of the laser light. The invention also discloses a laser projection feedback adjusting method and a vehicle. The laser projection feedback regulation system can accurately control the output power of the laser light source unit and ensure the projection effect.
Description
Technical Field
The invention relates to safe use of laser, in particular to a laser projection feedback adjusting system. In addition, the invention also relates to a laser projection feedback adjusting method and a vehicle.
Background
Under normal conditions, the laser projection module detects the brightness information of the surrounding environment by means of the light sensor in the using process, and adjusts the intensity of the emergent laser according to the detected brightness information, for example, the brightness of the laser can be slightly reduced in night environment or other dark light conditions, and the brightness of the laser can be slightly improved in the evening or early morning. The design can achieve a better prompt effect on one hand, and can reduce dazzling caused by laser reflection on the other hand, so that the sense organ comfort of a driver or pedestrians is improved.
However, the output power of a semiconductor laser cannot be kept constant due to various factors such as voltage, current, temperature, and operating time, and varies with the above factors. The specific effects are as follows: the output power of the laser can be increased by the instantaneous high current during starting; when the voltage is reduced, the output power of the laser is reduced; a decrease in ambient temperature will cause the output power of the laser to increase; an increase in ambient temperature will cause the output power of the laser to decrease; when the operating time is long, the service life of the semiconductor laser is reduced, thereby reducing the output power of the semiconductor laser.
The traditional output power control method is an input control method, namely, the input voltage and current value is controlled to ensure the output power, but the method is passive, the output power can float to a certain extent along with the influence of various factors, and the accurate control cannot be realized. The unstable power of the output laser can cause the image definition of road surface projection to fluctuate, which affects the original projection display effect, even can cause traffic accidents and affect the driving safety.
Disclosure of Invention
The technical problem to be solved by the present invention in the first aspect is to provide a laser projection feedback adjustment system, which can accurately control the output power of a laser light source unit and ensure the projection effect thereof.
The technical problem to be solved by the invention in the second aspect is to provide a laser projection feedback adjustment method, which can accurately control the output power of a laser light source unit and ensure the projection effect.
The technical problem of the third aspect to be solved by the present invention is to provide a vehicle, and a laser projection feedback adjustment system of the vehicle can accurately control the output power of a laser light source unit, and ensure the projection effect thereof.
In order to solve the above technical problem, a first aspect of the present invention provides a laser projection feedback adjustment system, which includes a control unit, a laser light source, a scanning imaging unit, a detection unit, and a light splitting unit; the light splitting unit is used for splitting laser emitted by the laser light source into a first laser branch and a second laser branch with a fixed power ratio; the scanning imaging unit is arranged on the first laser branch path so as to form a projection pattern and project the projection pattern on the ground; the detection unit is arranged on the second laser branch and used for detecting the optical power P of the second laser branchMeasuring(ii) a The control unit is connected with the detection unit to collect the optical power P of the second laser branchMeasuring(ii) a The control unit is adapted to vary the light power P according toMeasuringCalculating the total laser power P emitted by the laser light sourceGeneral assemblyAnd by comparing said total power PGeneral assemblyAnd the preset light-emitting power P of the laser light source0Whether to adjust the input current I of the laser light source is judged.
Preferably, the control unit 1 is adapted to calculate the total power P of the laser emitted from the laser light source according to the following formulaGeneral assembly：
PGeneral assembly＝PMeasuring/L
Wherein L is the laser power P on the second laser branchMeasuringTotal power P of laserGeneral assemblyThe ratio of (a) to (b).
Preferably, the control unit is adapted to calculate a total power PGeneral assemblyJudging the total power PGeneral assemblyWhether the light power is equal to the preset light-emitting power P0If yes, keeping the laser light source in an open state; if not, judging the total power PGeneral assemblyWhether the light output power is greater than the preset light output power P0(ii) a If yes, reducing the input current I of the laser light source; and if not, increasing the input current I of the laser light source.
Further preferably, the control unit is adapted to control the operation of the motor according toSetting a current change gradient delta I according to the magnitude of the rated current of the laser light source, and adjusting the input current I by taking the current change gradient delta I as a stepping value until the laser light source is in the total power PGeneral assemblyCurrent at and in the preset light-emitting power P0The difference between the currents below is smaller than the current variation gradient δ I.
Further preferably, the control unit is adapted to determine whether the input current I is higher than a preset current I according to the input current I of the laser light source0If so, turning off the laser light source, and if not, keeping the laser light source in an on state.
Further preferably, the laser light source is a collimated laser light source.
Further preferably, the light splitting unit is a polarization light splitting prism; the detection unit is a laser power meter, and a signal output end of the laser power meter is connected with a signal input end of the control unit.
In a second aspect, the present invention provides a feedback adjustment method for laser projection, including the following steps:
(1) dividing laser emitted by a laser source into a first laser branch and a second laser branch with a fixed power ratio, and detecting the optical power P on the second laser branchMeasuring；
(2) According to optical power PMeasuringCalculating the total laser power P emitted by the laser light sourceGeneral assembly；
(3) By comparing said total power PGeneral assemblyAnd the preset light-emitting power P of the laser light source0Whether to adjust the input current I of the laser light source is judged.
Preferably, in the step (2), the total power P of the laser emitted by the laser light source is calculated according to the following formulaGeneral assembly：
PGeneral assembly＝PMeasuring/L
Wherein L is the optical power P on the second laser branchMeasuringAnd the total power P of the laser emitted by the laser light sourceGeneral assemblyThe ratio of (a) to (b).
Preferably, said stepsIn step (3), the total power P is judgedGeneral assemblyWhether the light power is equal to the preset light-emitting power P0(ii) a If so, keeping the laser light source in an open state; if not, judging the total power PGeneral assemblyWhether the light output power is greater than the preset light output power P0(ii) a If yes, reducing the input current I of the laser light source; and if not, increasing the input current I of the laser light source.
Further preferably, a current variation gradient δ I is set according to the magnitude of the rated current of the laser light source, and the input current I is adjusted by taking the current variation gradient δ I as a stepping value until the laser light source reaches the total power PGeneral assemblyCurrent at and in the preset light-emitting power P0The difference between the currents below is smaller than the current variation gradient δ I.
Further preferably, the method further comprises: judging whether the input current I of the laser light source is higher than a preset current I or not0If so, turning off the laser light source, and if not, keeping the laser light source in an on state.
In a third aspect, the present invention provides a vehicle, which includes the laser projection feedback adjustment system according to any one of the above first aspects and executes the laser projection feedback adjustment method according to any one of the above second aspects.
Through the technical scheme, the laser projection feedback regulation system can calculate the total power of laser emitted by the laser light source through the laser power detected by the detection unit and can compare the total power PGeneral assemblyAnd the preset light-emitting power P of the laser light sourcePreparation ofWhether the input current of the laser light source is adjusted or not is judged according to the height of the projection screen, so that the light output power of the laser light source can be accurately controlled, the stability of output laser is guaranteed, a better projection effect is achieved, and potential safety hazards caused by overhigh or overlow power of the laser are reduced.
Further advantages of the present invention, as well as the technical effects of preferred embodiments, are further described in the following detailed description.
Drawings
FIG. 1 is a schematic block diagram of one embodiment of a laser projection feedback adjustment system of the present invention;
FIG. 2 is a schematic diagram of the structure of one embodiment of the feedback adjustment system for laser projection of the present invention;
FIG. 3 is a flow chart of one embodiment of a laser projection feedback adjustment method of the present invention;
fig. 4 is a flow chart of another embodiment of the feedback adjustment method for laser projection of the present invention.
Description of the reference numerals
1 control unit 2 laser light source
3 scanning imaging unit 4 detection unit
5 light splitting unit
a first laser branch and b second laser branch
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the description of the present invention, it should be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In a basic embodiment of the present invention, as shown in fig. 1 to 4, the present invention provides a laser projection feedback adjustment system, which includes a control unit 1, a laser light source 2, a scanning imaging unit 3, a detection unit 4, and a light splitting unit 5; the light splitting unit 5 is used for splitting laser emitted by the laser light source 2 into a first laser branch a and a second laser branch b with a fixed power ratio; the scanning imaging unit 3 is arranged on the first laser branch a to form a projection patternAnd projected on the ground; the detection unit 4 is disposed on the second laser branch b, and is used for detecting the optical power P of the second laser branch bMeasuring(ii) a The control unit 1 is connected with the detection unit 4 to collect the optical power P of the second laser branch bMeasuring(ii) a The control unit 1 is adapted to vary the light power PMeasuringThe total power P of the laser emitted by the laser source 2 is calculatedGeneral assemblyAnd by comparing the total power PGeneral assemblyPreset light output power P with laser light source 20Determines whether to adjust the input current I of the laser light source 2.
Specifically, the signal output terminal of the detection unit 4 is connected to the signal input terminal of the control unit 1 to transmit the power information detected by the detection unit 4 to the control unit 1. The control end of the control unit 1 is connected with the laser light source 2 and the signal input end of the scanning imaging unit 3 to control the work of the laser light source 2 and the work of the scanning imaging unit 3. The control unit 1 may be a control unit 1 provided in the vehicle itself, and a control program involved in the system of the present invention is input to the control unit 1. It may be a control unit 1 provided separately.
In the present invention, the light splitting unit 5 may be any structure or device capable of splitting a light beam passing through it into two light beams with a fixed power ratio, and specifically may be a polarization beam splitter prism and a depolarization beam splitter prism. The scanning and imaging unit 3 can scan the light emitted from the laser source 2 on the first laser branch a into a projection image and project the projection image onto the ground around the vehicle, and as an embodiment, the vehicle projection module can be used as a vehicle contour display device for displaying the contour of the vehicle, so as to prevent unnecessary traffic accidents caused by the fact that people around the vehicle cannot see the contour of the vehicle when the visibility is low. The projected pattern may be projected on the ground around the vehicle body at a vertical distance of 10-50cm from the vehicle body. The preset laser power of the projection pattern projected on the ground can be set according to IEC 60825 standard or GB 7247 standard, and then the preset light output power P is calculated according to the preset laser power and the power ratio of the first laser branch a and the second laser branch b0。
The above basic embodiment of the present invention provides a laserWhen the projection feedback adjusting system works, the laser light source 2 is started, laser is output from the laser light source 2, the laser emitted by the laser light source 2 is divided into a first laser branch a and a second laser branch b with fixed power ratio through the light splitting unit 5, the laser on the first laser branch a is projected to the ground around a vehicle after being imaged by the scanning imaging unit 3, and the detection unit 4 detects the laser power P on the second laser branch bMeasuringThe control unit 1 calculates the actual light output power P of the laser light source through the laser power of the second laser branch b and the power ratio of the first laser branch a to the second laser branch bGeneral assemblyBy comparing the actual luminous power PGeneral assemblyAnd a predetermined light output power P0To determine whether to adjust the input current I of the laser light source 2.
The laser projection feedback adjustment system provided by the above basic embodiment of the present invention can utilize the laser power P detected by the detection unit 4MeasuringThe total power P of the laser emitted by the laser source 2 is calculatedGeneral assemblyAnd can compare the total power PGeneral assemblyAnd the preset light-emitting power P of the laser light source 20Whether the input current I of the laser light source 2 is adjusted or not is judged according to the height of the laser light source, so that the light output power of the laser light source 2 can be accurately controlled, the stability of output laser is guaranteed, a better projection effect is achieved, and potential safety hazards caused by overhigh or overlow laser power are reduced.
In one embodiment of the present invention, the control unit 1 is adapted to calculate the total power P of the laser light emitted by the laser light source 2 according to the following formulaGeneral assembly：
PGeneral assembly＝PMeasuring/L
Wherein L is the laser power P on the second laser branch bMeasuringTotal power P of laserGeneral assemblyThe ratio of (a) to (b).
Specifically, the L value may be determined by the laser itself, when the adopted light splitting unit 5 is a polarization light splitting prism, the polarization light splitting prism may split the laser into S-polarized light and P-polarized light, and the ratio of the S-polarized light and the P-polarized light emitted by the laser light source 2 is fixed, so that the total power P of the laser light emitted by the laser light source 2 may be calculated by detecting the power of one of the polarized lightsGeneral assembly. More specifically, the detection unit 4 calculates the total power P of the laser light emitted from the laser light source 2 by the detected power of the P-polarized light and the extinction ratio of the polarization beam splitter prismGeneral assembly. Of course, if the light splitting unit 5 can split the laser into two parts with a fixed power ratio by other methods, the total power P of the laser emitted by the laser source 2 can also be calculated by the fixed power ratio and the laser power detected by the detection unit 4General assembly。
More specifically, taking L as 0.01 as an example, that is, the total laser power P after being split by the splitting unit 5General assemblyIs the laser power P on the second laser branch bMeasuring100 times of the total weight of the powder. Such as: when the power detection unit 4 detects that the laser power on the second laser branch b is 0.2W, the power detection unit detects that the laser power on the second laser branch b is 0.2W
PGeneral assembly＝PMeasuring/L＝0.2W/0.01＝20W。
In an embodiment of the invention, the control unit 1 is adapted to calculate the total power P, as shown in fig. 3General assemblyDetermining the total power PGeneral assemblyWhether it is equal to the preset light-emitting power P0If so, keeping the laser light source 2 in an open state, and enabling the laser on the first laser branch a to form a laser pattern and emit the laser pattern; if not, the total power P is judgedGeneral assemblyWhether the light output power is greater than the preset light output power P0(ii) a If yes, reducing the input current I of the laser light source 2; if not, the input current I of the laser light source 2 is increased. Can ensure the total power P of the laser light source 2General assemblyEqual to the preset light-emitting power P0The laser power can be prevented from being too high, and potential safety hazards are prevented; the effect which is originally required and cannot be achieved due to insufficient laser power can be prevented; the safe use of the laser is ensured.
In one embodiment of the present invention, the control unit 1 is adapted to set a current variation gradient δ I according to the magnitude of the rated current of the laser light source 2, and adjust the input current I by taking the current variation gradient δ I as a step value until the laser light source 2 is at the total power PGeneral assemblyCurrent at and in the preset light-emitting power P0The difference between the currents below is smaller than the current variation gradient δ I. Can be applied to various types of shoesThe laser projection module has wider applicability.
The current variation gradient δ I may be set by a person skilled in the art according to the rated current of the laser light source 2.
As an embodiment of the present invention, a value lower than or equal to twenty percent of the rated current is taken as the current variation gradient δ I. Preferably, in order to be able to adjust the total power P of the laser light source 2 more accurately and quicklyGeneral assemblyThe current change gradient may be provided in plural. For example, 20%, 10%, 5% and 1% of the rated current are respectively taken as the first current variation gradient δ I1Current second change gradient δ I2Third gradient of current delta I3And the fourth gradient δ I of variation of the sum current4. The above is just one way of obtaining the value of the current variation gradient δ I, and should not be understood as referring to the first variation gradient δ I of the current1Current second change gradient δ I2Third gradient of current delta I3And the fourth gradient δ I of variation of the sum current4Is limited to the specific numerical values of (a). In actual operation, δ I may be used first1Varying the input current I when the input current I is regulated by a value delta I1Total power P of laser light source 2General assemblyAt a predetermined light output power P0By floating up and down, can be at δ I2The input current I is regulated as a step value in order to be able to reduce the total power P of the laser light source 2 during a current regulationGeneral assemblyThe change value of (c). When the input current I is regulated by delta I2Total power P of laser light source 2General assemblyAt a predetermined light output power P0By floating up and down, can be at δ I3Adjusting the input current I as a step value; when the input current I is regulated by delta I3Total power P of laser light source 2General assemblyAt a predetermined light output power P0By floating up and down, can be at δ I3Regulating the input current I as a step value until the total power PGeneral assemblyAnd presetting the light-emitting power P0The equalization stops adjusting the input current I.
Specifically, δ I when the rated current of the laser light source 2 is 1.5A1Can be set to 0.3A, delta I2Can be set to 0.15A, delta I3Can be set to 0.075A, δ I4May be set to 0.015A.
However, during actual operation, the total power P will beGeneral assemblyAnd preset luminous power P0It may be difficult to adjust the values of (a) to be exactly the same. Therefore, at least one current varies with a gradient δ I when the total power PGeneral assemblyAnd preset luminous power P0The adjustment of the input current I can be stopped when the difference value of (d) is smaller than the minimum current change gradient.
Specifically, as another embodiment of the present invention, as shown in fig. 3, the laser projection feedback adjustment system includes a control unit 1, a laser light source 2, a scanning imaging unit 3, a detection unit 4, and a light splitting unit 5; the light splitting unit 5 is used for splitting laser emitted by the laser light source 2 into a first laser branch a and a second laser branch b with a fixed power ratio; the scanning imaging unit 3 is arranged on the first laser branch a so as to form a projection pattern and project the projection pattern on the ground; the detection unit 4 is disposed on the second laser branch b, and is used for detecting the optical power P of the second laser branch bMeasuring(ii) a The control unit 1 is connected with the detection unit 4 to collect the optical power P of the second laser branch bMeasuring(ii) a The control unit 1 is adapted to calculating a total power PGeneral assemblySetting a current change gradient delta I according to the rated current of the laser light source 2, and then judging the total power PGeneral assemblyWhether it is equal to the preset light-emitting power P0If so, keeping the laser light source 2 in an open state, and enabling the laser on the first laser branch a to form a laser pattern and emit the laser pattern; if not, the total power P is judgedGeneral assemblyWhether the light output power is greater than the preset light output power P0(ii) a If yes, inputting current I to reduce current change gradient delta I; if not, the input current I increases the current change gradient delta I until the laser light source 2 is in the total power PGeneral assemblyCurrent I below and preset light output power P0Current I ofPreparation ofThe difference between the current change gradients is smaller than the minimum current change gradient delta I, and the adjustment of the input current I can be stopped.
In an embodiment of the invention, the control unit 1 is adapted to determine whether the input current I is higher than a preset current I according to the input current I of the laser light source 20If so, the laser light source 2 is turned off, and if not, the laser light source 2 is kept in an on state. Can prevent the input current of the laser light source 2 from being larger than the preset current I when the input current I is increased0The potential safety hazard is caused, and the safety of the laser light source 2 in the use process is further improved.
In particular, a predetermined current I there0The current can be set by a person skilled in the art according to the safety of the laser light source circuit, and specifically can be a rated current in the laser circuit, so that the safe use of each device in the circuit is prevented from being influenced by the high current in the laser light source circuit.
As one embodiment of the present invention, as shown in fig. 4, the laser projection feedback adjustment system includes a control unit 1, a laser light source 2, a scanning imaging unit 3, a detection unit 4, and a light splitting unit 5; the light splitting unit 5 is used for splitting laser emitted by the laser light source 2 into a first laser branch a and a second laser branch b with a fixed power ratio; the scanning imaging unit 3 is arranged on the first laser branch a so as to form a projection pattern and project the projection pattern on the ground; the detection unit 4 is disposed on the second laser branch b, and is used for detecting the optical power P of the second laser branch bMeasuring(ii) a The control unit 1 is connected with the detection unit 4 to collect the optical power P of the second laser branch bMeasuring(ii) a The control unit 1 is adapted to calculating a total power PGeneral assemblySetting a current change gradient delta I according to the rated current of the laser light source 2, and then judging the total power PGeneral assemblyWhether it is equal to the preset light-emitting power P0If so, keeping the laser light source 2 in an open state, and enabling the laser on the first laser branch a to form a laser pattern and emit the laser pattern; if not, the total power P is judgedGeneral assemblyWhether the light output power is greater than the preset light output power P0(ii) a If yes, inputting current I to reduce current change gradient delta I; if not, the input current I increases the current change gradient delta I and judges whether the input current I is higher than the preset current I or not according to the input current I of the laser light source 20If yes, the laser light source 2 is closed, if not, the laser light source 2 is kept in an open state until the laser light source 2 is in the total power PGeneral assemblyCurrent I below and preset light output power P0Power offStream IPreparation ofThe difference between the current change gradients is smaller than the minimum current change gradient delta I, and the adjustment of the input current I can be stopped.
In order to enable the system to perform the adjustment more accurately, in one embodiment of the invention the laser light source 2 is a collimated laser light source. The laser is collimated and then emitted, so that the utilization efficiency of the laser can be more effectively improved, and the whole system can be more accurately adjusted and controlled.
In one embodiment of the present invention, the light splitting unit 5 is a polarization splitting prism; the detection unit 4 is a laser power meter, and a signal output end of the laser power meter is connected with a signal input end of the control unit 1. Preferably, the laser power meter is a semiconductor laser power meter, and the semiconductor laser power meter has higher precision and can more accurately measure the laser passing through the laser power meter. The polarization beam splitter prism divides the laser into a second laser branch b emitting along the original emitting direction of the laser and a first laser branch a perpendicular to the original emitting direction of the laser.
In a relatively preferred embodiment of the present invention, as shown in fig. 1, 2 and 4, the laser projection feedback adjustment system includes a control unit 1, a collimated laser light source, a scanning imaging unit 3, a laser power meter and a polarization splitting prism, wherein the collimated laser light source can emit laser with a fixed polarization proportion, the polarization splitting prism is arranged in the light emitting direction of the collimated laser light source and divides the laser emitted by the collimated laser light source into a second laser branch b emitted along the original direction of the laser and a first laser branch a perpendicular to the original direction of the laser, and the scanning imaging unit 3 is arranged on the first laser branch a to receive the laser on the first laser branch a and form a projection pattern for projection on the ground around the vehicle; the laser power meter is arranged on the second laser branch b and is used for detecting the laser power P on the second laser branch bMeasuring(ii) a The control unit 1 is connected with the laser power meter to receive the laser power P detected by the laser power meterMeasuringAnd by laser power PMeasuringAnd calculating the total power of the actual emergent laser of the collimation laser light source according to the fixed polarization proportion preset in the control unit 1Rate PGeneral assembly(ii) a The control unit 1 is connected to the collimated laser light source and is adapted such that the control unit 1 is adapted to calculate a total power PGeneral assemblySetting a current change gradient delta I according to the rated current of the laser light source 2, and then judging the total power PGeneral assemblyWhether it is equal to the preset light-emitting power P0If so, keeping the laser light source 2 in an open state, and enabling the laser on the first laser branch a to form a laser pattern and emit the laser pattern; if not, the total power P is judgedGeneral assemblyWhether the light output power is greater than the preset light output power P0(ii) a If yes, inputting current I to reduce current change gradient delta I; if not, the input current I increases the current change gradient delta I and judges whether the input current I is higher than the preset current I or not according to the input current I of the laser light source 20If yes, the laser light source 2 is closed, if not, the laser light source 2 is kept in an open state until the laser light source 2 is in the total power PGeneral assemblyCurrent at lower level and preset light-emitting power P0The adjustment of the input current I can be stopped when the difference value of the lower currents is smaller than the minimum current change gradient delta I; wherein the control unit 1 is based on the laser power PMeasuringCalculating the total laser power PGeneral assemblyThe formula of (1) is: pGeneral assembly＝PMeasuringL is the laser power P on the second laser branch bMeasuringTotal power P of laserGeneral assemblyThe ratio of (a) to (b).
The laser projection feedback adjusting system provided by the preferred embodiment can accurately adjust the laser power in the laser projection device and ensure the stability of the output laser, thereby achieving better projection effect and reducing the potential safety hazard caused by overhigh or overlow laser power. Meanwhile, the laser power can be adjusted, the input current I of the laser is ensured to be within a safety range, and potential safety hazards caused by overhigh input current I of the laser can be prevented.
In addition, the embodiment of the present invention further provides a laser projection feedback adjustment method, as shown in fig. 3, including the following steps:
(1) dividing laser emitted by a laser source 2 into a first laser branch a and a second laser branch b with a fixed power ratio, and detecting the optical power P on the second laser branch bMeasuring；
(2) According to optical power PMeasuringThe total power P of the laser emitted by the laser source 2 is calculatedGeneral assembly；
(3) By comparing the total power PGeneral assemblyPreset light output power P with laser light source 20Determines whether to adjust the input current I of the laser light source 2.
The laser projection feedback adjustment method provided by the above specific embodiment can be implemented by detecting the laser power P on the second laser branch bMeasuringThe total power P of the laser emitted by the laser source 2 is calculatedGeneral assemblyAnd can compare the total power PGeneral assemblyAnd the preset light-emitting power P of the laser light source 20Whether the input current I of the laser light source 2 is adjusted or not is judged according to the height of the projection light source, so that the light emitting power of the laser light source can be accurately controlled, the stability of output laser is guaranteed, a better projection effect is achieved, and potential safety hazards caused by overhigh or overlow laser power are reduced.
In one embodiment of the present invention, in step (2), the total power P of the laser light emitted from the laser light source 2 is calculated according to the following formulaGeneral assembly：
PGeneral assembly＝PMeasuring/L
Wherein L is the optical power P on the second laser branch bMeasuringAnd the total power P of the laser emitted by the laser source 2General assemblyThe ratio of (a) to (b).
In one embodiment of the present invention, in step (3), the total power P is determinedGeneral assemblyWhether it is equal to the preset light-emitting power P0(ii) a If so, keeping the laser light source 2 in an open state, and forming and outputting a laser pattern by the laser on the first laser branch a; if not, the total power P is judgedGeneral assemblyWhether the light output power is greater than the preset light output power P0(ii) a If yes, reducing the input current I of the laser light source 2; if not, the input current I of the laser light source 2 is increased. Can ensure the total power P of the laser light source 2General assemblyEqual to the preset light-emitting power P0The laser power can be prevented from being too high, and potential safety hazards are prevented; the effect which is originally required and cannot be achieved due to insufficient laser power can be prevented; the safe use of the laser is ensured.
As a specific embodiment of the invention, the current change gradient delta I is set according to the magnitude of the rated current of the laser light source 2, and the input current I is adjusted by taking the current change gradient delta I as a stepping value until the laser light source 2 is at the total power PGeneral assemblyCurrent at lower level and preset light-emitting power P0The difference between the currents below is smaller than the current variation gradient deltai. The laser projection module can be suitable for various laser projection modules, and has wider applicability.
As an embodiment of the present invention, as shown in fig. 3, the laser projection feedback adjustment method includes the following steps:
(1) dividing laser emitted by a laser source 2 into a first laser branch a and a second laser branch b with a fixed power ratio, and detecting the optical power P on the second laser branch bMeasuring；
(2) According to optical power PMeasuringThe total power P of the laser emitted by the laser source 2 is calculatedGeneral assembly；
(3) Setting the current variation gradient delta I according to the rated current if PGeneral assembly＝P0Then keeping the laser light source 2 in an on state; if PGeneral assembly>P0If so, the input current I reduces the current change gradient delta I; if PGeneral assembly<P0The input current I increases the current variation gradient δ I until the laser light source 2 is at the total power PGeneral assemblyCurrent I below and preset light output power P0Current I ofPreparation ofThe difference between the current change gradients is smaller than the minimum current change gradient delta I, and the adjustment of the input current I can be stopped.
In one embodiment of the present invention, the method further comprises: judging whether the input current I of the laser light source 2 is higher than the preset current I0If so, the laser light source 2 is turned off, and if not, the laser light source 2 is kept in an on state. Can prevent the input current of the laser light source 2 from being larger than the preset current I when the input current I is increased0The potential safety hazard is caused, and the safety of the laser light source 2 in the use process is further improved.
In a relatively preferred embodiment of the present invention, as shown in fig. 4, the laser projection feedback adjustment method comprises the steps of:
(1) dividing laser emitted by a laser source 2 into a first laser branch a and a second laser branch b with a fixed power ratio, and detecting the optical power P on the second laser branch bMeasuring；
(2) The total laser power P emitted by the laser light source 2 is calculated according to the following formulaGeneral assembly：
PGeneral assembly＝PMeasuring/L
Wherein L is the optical power P on the second laser branch bMeasuringAnd the total power P of the laser emitted by the laser source 2General assemblyThe ratio of (A) to (B);
(3) setting the current variation gradient delta I according to the rated current if PGeneral assembly＝P0Then keeping the laser light source 2 in an on state; if PGeneral assembly>P0The input current I is decreased by delta I if PGeneral assembly<P0Increasing the input current by delta I and judging whether I is larger than I0If I is>I0The laser light source 2 is turned off, if I<I0Then the total power P is determinedGeneral assemblyAnd preset luminous power P0Until the laser light source 2 is at the total power PGeneral assemblyCurrent I below and preset light output power P0Current of (I)0The difference between them is smaller than the minimum current change gradient deltai.
The laser projection feedback adjusting method provided by the preferred embodiment can accurately adjust the laser power in the laser projection device and ensure the stability of the output laser, thereby achieving a better projection effect and reducing the potential safety hazard caused by overhigh or overlow laser power. Meanwhile, the laser power can be adjusted, the input current I of the laser is ensured to be within a safety range, and potential safety hazards caused by overhigh input current I of the laser can be prevented.
Meanwhile, an embodiment of the present invention further provides a vehicle, which includes the laser projection feedback adjustment system according to any one of the above first aspect and executes the laser projection feedback adjustment method according to any one of the above second aspect.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (13)
1. A laser projection feedback regulation system is characterized by comprising a control unit (1), a laser light source (2), a scanning imaging unit (3), a detection unit (4) and a light splitting unit (5);
the light splitting unit (5) is used for splitting laser emitted by the laser light source (2) into a first laser branch (a) and a second laser branch (b) with a fixed power ratio;
the scanning imaging unit (3) is arranged on the first laser branch (a) so as to form a projection pattern and project the projection pattern on the ground; the detection unit (4) is arranged on the second laser branch (b) and is used for detecting the optical power P of the second laser branch (b)Measuring；
The control unit (1) is connected with the detection unit (4) so as to be capable of collecting the optical power P of the second laser branch (b)Measuring；
The control unit (1) is adapted to depend on the light power PMeasuringThe total power P of the laser emitted by the laser source (2) is calculatedGeneral assemblyAnd by comparing said total power PGeneral assemblyWith a predetermined light output power P of the laser light source (2)0Is used for judging whether to adjust the input current I of the laser light source (2).
2. The laser projection feedback regulation system of claim 1, wherein the control unit (1) is adapted to calculate the total laser power P emitted by the laser light source (2) according to the following formulaGeneral assembly：
PGeneral assembly＝PMeasuring/L
Wherein L is a second laser branch(b) Laser power P ofMeasuringTotal power P of laserGeneral assemblyThe ratio of (a) to (b).
3. Laser projection feedback adjustment system according to claim 1, wherein the control unit (1) is adapted to determine the total power P calculatedGeneral assemblyJudging the total power PGeneral assemblyWhether the light power is equal to the preset light-emitting power P0If yes, keeping the laser light source (2) in an open state; if not, judging the total power PGeneral assemblyWhether the light output power is greater than the preset light output power P0(ii) a If yes, reducing the input current I of the laser light source (2); and if not, increasing the input current I of the laser light source (2).
4. The laser projection feedback adjustment system according to claim 3, characterized in that the control unit (1) is adapted to set a current variation gradient δ I according to the magnitude of the rated current of the laser light source (2) and to adjust the input current I with the current variation gradient δ I as a step value until the laser light source (2) is at the total power PGeneral assemblyCurrent at and in the preset light-emitting power P0The difference between the currents below is smaller than the current variation gradient δ I.
5. The laser projection feedback adjustment system according to claim 3, wherein the control unit (1) is adapted to determine whether the input current I is higher than a preset current I based on the input current I of the laser light source (2)0If yes, the laser light source (2) is turned off, and if not, the laser light source (2) is kept in an open state.
6. The laser projection feedback adjustment system according to any one of claims 1-5, wherein the laser light source (2) is a collimated laser light source.
7. The laser projection feedback adjustment system according to any of claims 1-5, wherein the beam splitting unit (5) is a polarizing beam splitting prism;
the detection unit (4) is a laser power meter, and a signal output end of the laser power meter is connected with a signal input end of the control unit (1).
8. A laser projection feedback adjustment method is characterized by comprising the following steps:
(1) dividing laser emitted by a laser source (2) into a first laser branch (a) and a second laser branch (b) with a fixed power ratio, and detecting the light power P on the second laser branch (b)Measuring；
(2) According to optical power PMeasuringThe total power P of the laser emitted by the laser source (2) is calculatedGeneral assembly；
(3) By comparing said total power PGeneral assemblyWith a predetermined light output power P of the laser light source (2)0Is used for judging whether to adjust the input current I of the laser light source (2).
9. The laser projection feedback adjustment method according to claim 8, wherein in the step (2), the total power P of the laser light emitted from the laser light source (2) is calculated according to the following formulaGeneral assembly：
PGeneral assembly＝PMeasuring/L
Wherein L is the optical power P on the second laser branch (b)MeasuringAnd the total laser power P emitted by the laser light source (2)General assemblyThe ratio of (a) to (b).
10. The laser projection feedback adjustment method according to claim 8 or 9, wherein in the step (3), the total power P is determinedGeneral assemblyWhether the light power is equal to the preset light-emitting power P0(ii) a If yes, keeping the laser light source (2) in an open state; if not, judging the total power PGeneral assemblyWhether the light output power is greater than the preset light output power P0(ii) a If yes, reducing the input current I of the laser light source (2); and if not, increasing the input current I of the laser light source (2).
11. The laser projection feedback adjustment method according to claim 10, characterized in that a current variation gradient δ I is set according to the magnitude of the rated current of the laser light source (2), and the input current I is adjusted by taking the current variation gradient δ I as a step value until the laser light source (2) is at the total power PGeneral assemblyCurrent at and in the preset light-emitting power P0The difference between the currents below is smaller than the current variation gradient δ I.
12. The laser projection feedback adjustment method of claim 10, further comprising: judging whether the input current I of the laser light source (2) is higher than a preset current I or not0And if yes, the laser light source (2) is turned off.
13. A vehicle comprising a laser projection feedback adjustment system according to any one of claims 1 to 7 and performing the laser projection feedback adjustment method of any one of claims 8-12.
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Application publication date: 20210202 |