CN114325741B - Detection module and laser ranging system - Google Patents
Detection module and laser ranging system Download PDFInfo
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- CN114325741B CN114325741B CN202111670254.0A CN202111670254A CN114325741B CN 114325741 B CN114325741 B CN 114325741B CN 202111670254 A CN202111670254 A CN 202111670254A CN 114325741 B CN114325741 B CN 114325741B
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Abstract
The application discloses survey module and laser rangefinder system, this survey module including be located a plurality of first detection subassemblies in first region and be located a plurality of second detection subassemblies in the second region. Since the distance between every two adjacent first detection assemblies is larger than the distance between every two adjacent second detection assemblies, the detection resolution of the second area can be ensured to be higher. Accordingly, by covering the detection region of each second detection assembly of the second region with a region having a high occurrence probability of the detection object, the fine detection of the detection object can be realized. The detection module can be ensured to have a larger detection range by enabling the detection area of each first detection assembly of the first area to cover the area with lower occurrence probability of the detection object.
Description
Technical Field
The application relates to the field of laser measurement, in particular to a detection module and a laser ranging system.
Background
In the field of laser measurement, a laser ranging system may use a Frequency Modulated Continuous Wave (FMCW) technique to measure the distance between a target object and the laser ranging system and the moving speed of the target object relative to the laser ranging system.
In the related art, a laser ranging system generally includes a laser light source and a plurality of detectors. The laser light source emits local oscillator light, and the local oscillator light can generate reflected light after being emitted by a target object. The plurality of detectors are configured to generate a detection electrical signal based on the detected local oscillator light and the reflected light, and the detection electrical signal may be used to determine a distance between the target object and the laser ranging system and a moving speed of the target object.
In order to improve the detection resolution of the laser ranging system, the number of detectors needs to be increased, which leads to higher weight and structural complexity of the laser ranging system.
Disclosure of Invention
The application provides a survey module and laser rangefinder system can solve the higher problem of weight and the structure complexity of laser rangefinder system among the correlation technique. The technical scheme is as follows:
in one aspect, a detection module is provided, the detection module includes:
a plurality of detection assemblies arranged along the target direction, wherein the plurality of detection assemblies comprise a plurality of first detection assemblies positioned in a first area and a plurality of second detection assemblies positioned in a second area, the distance between every two adjacent first detection assemblies is in a first distance range, the distance between every two adjacent second detection assemblies is in a second distance range, and the lower limit of the first distance range is larger than the upper limit of the second distance range;
each detection assembly is used for detecting local oscillator light emitted by a light source and reflected light of the local oscillator light reflected by a target object so as to generate a detection electric signal, and the detection electric signal is used for indicating the distance between the target object and the detection module and/or the moving speed of the target object.
Optionally, the first region includes two sub-regions, each of the sub-regions is provided with a plurality of the first detection assemblies, and the second region is located between the two sub-regions.
Optionally, the number of the plurality of second detection assemblies is greater than the number of the plurality of first detection assemblies in each of the sub-regions.
Optionally, the plurality of first detection assemblies are arranged at equal intervals, and the plurality of second detection assemblies are arranged at equal intervals.
Optionally, each of the detection assemblies comprises a grating coupler and a balanced detector;
the grating coupler is used for coupling the reflected light to the balanced detector;
the balance detector is used for performing photoelectric conversion on interference light of the reflected light and the local oscillator light to generate detection current serving as the detection electric signal.
Optionally, each of the detection assemblies further includes a transimpedance amplifier for converting the detection current into a detection voltage as the detection electrical signal.
Optionally, each of the detection assemblies further includes a filter, and the filter is connected to the transimpedance amplifier and is configured to filter the detection voltage output by the transimpedance amplifier.
Optionally, each of the detection assemblies further includes an optical coupler, and the optical coupler is configured to combine the local oscillator light and the reflected light, and split the interference light obtained after the light combination into two beams and transmit the two beams to the balanced detector.
Optionally, the grating coupler, the balanced detector, the transimpedance amplifier, and the optical coupler are all integrated in the same chip.
In another aspect, a laser ranging system is provided, the system comprising: a light source, a detection module according to the above aspect, and a signal processing component;
the light source is used for emitting local oscillation light;
the signal processing assembly is used for processing the detection electric signal output by the detection module so as to determine the distance between the target object and the detection module and/or the moving speed of the target object.
The beneficial effect that technical scheme that this application provided brought includes at least:
the application provides a survey module and laser rangefinder system, should survey the module including being located a plurality of first detection subassemblies in the first region and being located a plurality of second detection subassemblies in the second region. Since the distance between every two adjacent first detection assemblies is larger than the distance between every two adjacent second detection assemblies, the detection resolution of the second area can be ensured to be higher. Accordingly, the detection region of each second detection assembly of the second region covers the region with higher occurrence probability of the detection object, so that the detection object can be finely detected. The detection module can be ensured to have a larger detection range by enabling the detection area of each first detection assembly of the first area to cover the area with lower occurrence probability of the detection object.
Based on above-mentioned analysis can know, the scheme that this application provided need not a large amount of detection subassemblies, can be in great detection range to higher detection resolution ratio reliably surveys the detection object, thereby has effectively avoided increasing the weight and the structure complexity of surveying the module, has reduced the cost of surveying the module.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a laser ranging system according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a frequency curve of local oscillator light and probe light according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a detection module according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a probe assembly according to an embodiment of the present disclosure;
fig. 5 is a schematic partial structure diagram of a detection module according to an embodiment of the present disclosure;
FIG. 6 is a schematic structural diagram of another probe assembly provided in an embodiment of the present application;
fig. 7 is a schematic diagram of photoelectric conversion performed on interference light according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a chip in a probing module according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a laser ranging system according to an embodiment of the present disclosure. Referring to fig. 1, the system includes: a light source 10, a detection module 20, and a signal processing module 30.
Wherein the light source 10 is used to emit local oscillator light. The detection module 20 is configured to detect the local oscillator light emitted by the light source 10 and the reflected light of the local oscillator light reflected by the target object, so as to generate a detection electrical signal. The signal processing component 30 is used for processing the detection electrical signal output by the detection module 20 to determine the distance between the object and the detection module 20, and/or the moving speed of the object. The moving speed of the object may be a moving speed of the object relative to the detection module 20.
In the embodiment of the present application, the light source 10 may be a laser. The local oscillator light (also referred to as the emitted light) emitted by the light source 10 may be a frequency modulated continuous wave. For example, the local oscillator light may be a continuous optical signal whose frequency modulation mode is a triangular wave. One part of the local oscillation light emitted by the light source 10 may be transmitted to the detection module 20 through the optical devices M1 and M2, and the other part may be transmitted to the target object through the optical device M1. The reflected light (which may also be referred to as an echo signal) formed by the local oscillation light transmitted to the target object being reflected by the target object can be transmitted to the detection module 20. The reflected light has a certain frequency difference compared with the local oscillation light. The optical device M1 may be a beam splitter. The optical splitter may transmit a part of the local oscillation light emitted from the light source 10 to the target object and reflect another part to the optical device M2. For example, the optical splitter may transmit 99% of the local oscillator light and reflect 1% of the local oscillator light. The optical device M2 may be a reflector.
Fig. 2 is a graph of a frequency sweep of the local oscillator light and the reflected light according to the embodiment of the present application. Wherein the vertical axis of the graph represents frequency (ν) and the horizontal axis of the graph represents time (t). The solid line is a frequency curve of the local oscillation light, and the dotted line is a frequency curve of the reflected light. Referring to fig. 2, it can be seen that the frequency curve of the reflected light reflected by the target is similar to the frequency curve of the local oscillator light, but the reflected light has a certain frequency difference from the local oscillator light.
The detection module 20 may perform a frequency mixing process on the detected local oscillation light and the reflected light to generate an optical beat, i.e., a beat signal. The frequency of the beat signal is the frequency difference between the local oscillator light and the reflected light. The detection module 20 may further perform photoelectric conversion on the beat signal, thereby generating a detection electrical signal.
Optionally, the signal processing component 30 may include an analog-to-digital converter (ADC) and digital signal processing circuitry. The analog-to-digital converter is configured to perform analog-to-digital conversion on the detection electrical signal output by the detection module 20, so as to convert the detection electrical signal (i.e., an analog signal) into a digital signal. The analog-to-digital conversion module may then transmit the digital signal to a digital signal processing circuit for further processing.
The digital signal processing circuit may be an Application Specific Integrated Circuit (ASIC) or a Programmable Logic Device (PLD). The PLD may be a Complex Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), or a General Array Logic (GAL).
Optionally, the laser ranging system provided in the embodiment of the present application may be used to detect a moving speed and/or a distance of a vehicle, that is, the target object may be a vehicle. Accordingly, the laser ranging system may be deployed in a vehicle (e.g., a roof of a vehicle), or in roadside equipment.
Fig. 3 is a schematic structural diagram of a detection module according to an embodiment of the present application, and referring to fig. 3, the detection module 20 includes: a plurality of detection assemblies arranged along a target direction Y. The plurality of detector modules includes a plurality of first detector modules 201 located in a first area and a plurality of second detector modules 202 located in a second area B.
The target direction Y may be a direction perpendicular to a horizontal plane, also referred to as a vertical direction. Each detection component in the detection module 20 is configured to detect local oscillator light emitted by the light source 10 and reflected light of the local oscillator light reflected by the target object, so as to generate a detection electrical signal. The detection electric signal is used for indicating the distance between the target object and the detection module and/or the moving speed of the target object.
In the embodiment of the present application, a distance between every two adjacent first detection assemblies is in a first distance range, a distance between every two adjacent second detection assemblies is in a second distance range, and a lower limit of the first distance range is greater than an upper limit of the second distance range. That is, the spacing between the second probe assemblies 202 disposed in the second region B is small, and the spacing between the first probe assemblies 201 disposed in the first region is large. Alternatively, it can be understood that: the density of the detection assemblies arranged in the second area B is greater than the density of the detection assemblies arranged in the first area.
It will be appreciated that the higher the density of detection elements arranged along the target direction Y in a region, i.e. the greater the number of detection elements arranged within the region, the higher the detection resolution of the region. Therefore, in the embodiment of the present application, the detection resolution of the second area B is higher than that of the first area.
It is also understood that the regions detectable by the plurality of second detecting elements 202 in the second region B may be regions with higher occurrence probability of the detected objects, and may also be referred to as regions of interest (ROI). The first region may be a region where the detection object has a low occurrence probability.
For example, assuming that the detection module is disposed on a vehicle and the detection object is another vehicle, the region detectable by the second detection assemblies 202 in the second region B may be a region directly in front of or directly behind the vehicle. The region detectable by the second detection assemblies 202 in the first region a may be a ground region on which the vehicle is traveling or a sky region above the vehicle.
To sum up, the embodiment of the application provides a detection module. The detection module comprises a plurality of first detection assemblies positioned in a first area and a plurality of second detection assemblies positioned in a second area. Since the distance between every two adjacent first detection assemblies is larger than the distance between every two adjacent second detection assemblies, the detection resolution of the second area can be ensured to be higher. Accordingly, the detection region of each second detection assembly of the second region covers the region with higher occurrence probability of the detection object, so that the detection object can be finely detected. The detection module can be ensured to have a larger detection range by enabling the detection area of each first detection assembly of the first area to cover the area with lower occurrence probability of the detection object.
Based on the analysis, the detection module that this application embodiment provided need not a large amount of detection subassemblies, can be in great detection range to higher detection resolution ratio reliably surveys the detection object, thereby has effectively avoided increasing the weight and the structure complexity of detecting the module, has reduced the cost of detecting the module.
In the embodiment of the present application, the detection resolution r of any one region in the detection module 20 can be expressed as: r = θ/N. Where θ is the field angle θ of a certain area in the detection module 20 in the target direction Y, and N is the number of detection elements included in the area. It is understood that, referring to fig. 2, a vertex of the field angle θ of a certain area in the target direction Y may be any point on the target object reflection surface, and two edges of the field angle θ are connecting lines between the vertex and two boundary points of the area arranged in the target direction Y.
For example, referring to fig. 2, it is assumed that the first area in the detection module includes sub-areas A1 and A2. If the field angle θ 1 of the sub-area A1 and the field angle θ 3 of the sub-area A2 are both 14.4 °, the field angle θ 2 of the second area B is 3.2 °, 16 first detection assemblies 201 are arranged in each of the sub-areas A1 and A2, and 32 second detection assemblies 202 are arranged in each of the second area B. The detection resolution r1 of the subregion A1 =0.9 °, the detection resolution r3 of the subregion A2 =0.9 °, and the detection resolution r2 of the second region B =0.1 °.
Alternatively, referring to fig. 3, the first area may comprise two sub-areas A1 and A2, wherein each sub-area is provided with a plurality of first detection assemblies 201. Also, the second region B may be located between the two sub-regions A1 and A2.
Since the region detectable by the detecting element located in the middle region of the detecting module 20 is usually a region with a high probability of detecting the object, the distance between the detecting elements in the middle region, i.e. the second region B, can be set to be smaller, thereby improving the detecting resolution of the second region B. In addition, the area with lower occurrence probability of the detection object, namely the distance between the detection assemblies in the sub-areas A1 and A2, can be set to be larger, so that the number of the detection assemblies required to be set in the sub-areas A1 and A2 is reduced, and the weight, the structural complexity and the cost of the detection module are effectively reduced.
Optionally, the number of the plurality of second detection assemblies 202 in the second area B may be larger than the number of the first detection assemblies 201 in each sub-area A1 or A2 of the first area.
Since the spacing between the second detection members 202 disposed in the second region B is small, the spacing between the first detection members 201 disposed in the first region is large. Therefore, the second area B can be arranged with a larger number of second detection elements 202. Accordingly, the detection resolution of the second area B is higher than that of the first area.
For example, the number of the plurality of second detection assemblies 202 disposed in the second area B may be 32, and the number of the plurality of first detection assemblies 201 disposed in each sub-area in the first area may be 16.
Alternatively, the plurality of first detection assemblies 201 may be arranged at equal intervals, and the plurality of second detection assemblies 202 may also be arranged at equal intervals. Since the direction of the reflected light entering the detection module 20 is fixed, the detection components in each region are arranged at equal intervals, so that each grating coupler 210 in the detection module 20 can be ensured to efficiently receive the reflected light, and the processing difficulty of the detection electrical signal is further reduced. Moreover, the manufacturing process of the detection module 20 can be simplified by arranging the detection components of each region at equal intervals.
Of course, the plurality of first detecting elements 201 may also be arranged at unequal intervals, and the plurality of second detecting elements 202 may also be arranged at unequal intervals. For example, for a scene in which the first region includes two sub-regions A1 and A2, the plurality of first detection assemblies 201 in each sub-region may be arranged at equal intervals, and the intervals between the first detection assemblies 201 in different sub-regions may be different, but all lie within the first interval range.
It is understood that the second area B may also include a plurality of sub-areas, wherein each sub-area includes a plurality of second detection assemblies 202 arranged at equal intervals, and the intervals between the second detection assemblies 202 in different sub-areas may be different, but all lie within the second interval range.
Since the spacing between the detection assemblies in different sub-regions in the first or second region B may be different, the detection resolution of the different sub-regions may also be different. Based on the actual scene that the detection module 20 was used, the interval of detecting the subassembly in each subregion in the adjustment detection module 20 to the detection resolution ratio of each region in the flexible configuration detection module 20, and then realize the nimble detection to the detection object.
The number of sub-regions included in the first region, and the number and the setting position of sub-regions included in the second region B are not limited in the embodiments of the present application. That is, the number and the position of the plurality of sub-areas included in the first area and the number and the position of the plurality of sub-areas included in the second area B can be flexibly adjusted according to the requirements of the application scenario of the laser ranging system.
For example, the second region B may include two sub-regions B1 and B2. The two sub-areas B1 and B2 may be located between the two sub-areas A1 and A2 of the first area. Alternatively, the two sub-areas A1 and A2 of the first area may both be located between the two sub-areas of the second area B. Alternatively, the two sub-regions B1 and B2 may be staggered from the two sub-regions A1 and A2 of the first region.
It can be understood that, the structures of the detection components in the detection module provided by the embodiment of the present application are the same. Fig. 4 is a schematic structural diagram of another detection assembly provided in the embodiment of the present application, and fig. 5 is a schematic partial structural diagram of a detection module 20 provided in the embodiment of the present application. Referring to fig. 4 and 5, each of the detecting modules 20 may include: a grating coupler 210 and a balanced detector 220.
Wherein the grating coupler 210 is used to couple the reflected light to the balanced detector 220. The balance detector 220 is configured to perform photoelectric conversion on interference light of the reflected light and the local oscillation light, and generate a detection current as a detection electrical signal.
In the embodiment of the present application, the grating coupler 210 may receive the reflected light formed after being reflected by the target object, and couple the received reflected light to the balanced detector 220 through the optical waveguide. Alternatively, the grating coupler 210 may be an apodized grating coupler formed by etching the substrate on which the detection module 20 is disposed.
Fig. 6 is a schematic structural diagram of another detection assembly provided in the embodiment of the present application. Referring to fig. 6, the balanced detector 220 in the detection assembly may include two photodiodes D1 and D2. The interference light transmitted to the balanced detector 220 can make the two photodiodes D1 and D2 in a conductive state and generate a detection current, i.e., a detection electrical signal.
With continued reference to fig. 4, 5, and 6, the detection assembly may further include a trans-impedance amplifier (TIA) 230. The transimpedance amplifier 230 is configured to convert the detection current into a detection voltage as a detection electrical signal. For example, as shown in fig. 6, the transimpedance amplifier 230 may include an amplifier A1 and a first resistor R1.
It can be understood that the power of the local oscillator light transmitted to the detection module 20 via the optical devices M1 and M2 is only a small portion (for example, 1/100) of the power of the local oscillator light emitted by the light source 10, and the reflected light formed after the local oscillator light emitted by the light source 10 is transmitted to the target object via the optical device M1 and is reflected by the target object loses much energy during the transmission and reflection processes. Therefore, the interference light formed by the reflected light received by the balanced detector 220 and the local oscillator light is also weak. Accordingly, the detection current output by the balanced detector 220 is also relatively small (generally in the order of microamperes), which is inconvenient for subsequent signal processing.
In the embodiment of the present application, the transimpedance amplifier 230 is disposed after the balanced detector 220, so that the detection current with small current intensity can be converted into a detection voltage (generally in the order of volts) which is easy to handle. Then, the transimpedance amplifier 230 may transmit the detection voltage as a detection electrical signal to the signal processing component 30, and the signal processing component 30 may further determine the distance between the target object and the detection module 20 and/or the moving speed of the target object more accurately based on the detection electrical signal in the form of the voltage.
Optionally, as shown in fig. 4 and fig. 6, each detection assembly may further include a filter 240, and the filter 240 is connected to the transimpedance amplifier 230 for filtering the detection voltage output by the transimpedance amplifier 230.
It can be understood that the detection electrical signal output from the transimpedance amplifier 230 is accompanied by a noise signal. The filter 240 may filter (may also be referred to as pre-process) the detection electrical signal, and transmit the filtered detection electrical signal to the signal processing assembly 30 through the output interface of the detection module 20. Since the filter 240 can filter out noise signals in the electrical detection signal, it is ensured that the quality of the electrical detection signal transmitted to the signal processing module 30 is good.
Alternatively, the filter 240 may be an RC filter. For example, referring to fig. 5, the filter 240 may include a capacitor C and a second resistor R2 connected in parallel.
With continued reference to fig. 4 and fig. 6, each detection component in the detection module 20 may further include an optical coupler 250, where the optical coupler 250 is configured to combine the local oscillation light and the reflected light, divide the interference light obtained after the light combination into two beams, and transmit the two beams to the balanced detector 220. For example, the two interference lights may be transmitted to the two photodiodes D1 and D2 of the balanced detector 220, respectively.
For example, as shown in fig. 5, the local oscillation light emitted from the light source 10 may be split into multiple paths after being reflected by the optical device M2. Wherein each Lu Benzhen light can be transmitted to the optical coupler 250 in one detection assembly through silica-based single mode waveguide. Moreover, after receiving the reflected light, the grating coupler 210 in each detection assembly can couple the reflected light into the silicon-based single-mode waveguide through the tapered waveguide, and then transmit the reflected light to the optical coupler 250 through the silicon-based single-mode waveguide.
As shown in fig. 6 and 7, the local oscillation light and the reflected light can interfere with each other in the optical coupler 250 to generate a beat signal, and the optical coupler 250 can further split the interference light into two beams at a predetermined splitting ratio. The optical coupler 250 may have a splitting ratio of 1:1 (or 50. That is, the optical coupler 250 may divide the interference light into two interference lights having equal intensity, and transmit the two interference lights to the balanced detector 220 for photoelectric conversion.
Referring to fig. 7, it can also be seen that the balanced detector 220 performs photoelectric conversion on the two interference lights, so as to output two current signals with a certain frequency difference. Accordingly, in the photoelectric conversion process, the balanced detector 220 can effectively suppress the common-mode noise in the output detection current signal, and improve the signal-to-noise ratio of the detection current signal. Furthermore, the detection sensitivity of the laser ranging system can be improved, and the limit detection distance of the laser ranging system is improved.
Fig. 8 is a schematic structural diagram of a chip in a detection module according to an embodiment of the present disclosure, and as shown in fig. 8, in the detection module 20, the grating coupler 210, the balanced detector 220, the transimpedance amplifier 230, and the optical coupler 250 included in each detection unit may all be integrated in the same chip. This chip may also be referred to as a probing chip.
It can be understood that, by integrating the devices included in each probe assembly in the probe module 20 on the same chip, the length of the connection lines between the devices can be effectively shortened, so that the overall coverage area of the devices is small. Moreover, when the plurality of devices are integrated on the same chip, the capacitance/inductance characteristics (i.e., parasitic capacitance/inductance) of the inductance, capacitance and connection line pins inside the plurality of devices under a high frequency condition can be effectively inhibited, so that the integrity of the detection electrical signal in the transmission process of the detection module 20 is ensured, and the quality of the detection electrical signal transmitted from the detection module 20 to the signal processing assembly 30 is better.
In the manufacturing process of the detection module 20, after the devices included in each detection component in the detection module 20 are integrated on the same detection chip, the detection module 20 may be soldered on a Printed Circuit Board (PCB). The detection module 20 may then be connected to the signal processing component 30.
Optionally, in this embodiment, the detection module 20 may include one or more detector bars, each detector bar including a plurality of detection assemblies arranged along the target direction Y. The number of the detection assemblies included in each of the detection linear arrays may also be referred to as the number of the detection linear arrays.
For example, taking fig. 3 as an example, it is assumed that the detection module 20 includes one detection line array, and the detection line array includes 64 detection assemblies arranged along the target direction Y, so the detection module 20 may also be referred to as a1 × 64 line detection module.
It is understood that, if the detection module 20 includes a plurality of detector bars, the detector bars may be arranged along a direction perpendicular to the target direction Y (e.g., a horizontal direction). Moreover, the number of the detection assemblies included in each detection linear array can be the same. Accordingly, the detection module 20 may include a plurality of detection elements arranged in an array in a plane parallel to the target direction Y.
For example, assuming that the detection module 20 includes N detection linear arrays, each of which includes P detection assemblies, the N × P detection assemblies included in the detection module 20 may form an area array with P rows and N columns. Wherein N and P are both integers greater than 1. For example, N = P =4.
To sum up, the embodiment of the application provides a detection module. The detection module comprises a plurality of first detection assemblies positioned in a first area and a plurality of second detection assemblies positioned in a second area. Since the distance between every two adjacent first detection assemblies is larger than the distance between every two adjacent second detection assemblies, the detection resolution of the second area can be ensured to be higher. Accordingly, the detection region of each second detection assembly of the second region covers the region with higher occurrence probability of the detection object, so that the detection object can be finely detected.
That is, the detection module that this application embodiment provided need not a large amount of detection subassemblies, can survey the object with higher detection resolution ratio and survey to effectively avoided increasing the weight and the structure complexity of surveying the module, reduced the cost of surveying the module. And the grating coupler, the balance detector, the trans-impedance amplifier and the optical coupler in the detection module are all integrated on the same chip, so that the size of the laser ranging system can be effectively reduced, and the quality of a detection electric signal received by the signal processing assembly is ensured to be good.
It is to be understood that the term "plurality" means two or more in the present application.
Reference herein to "and/or" means that three relationships may exist, for example, a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and is not intended to limit the present application, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (3)
1. A detection module, characterized in that, the detection module is disposed in vehicle or roadside equipment, the detection module includes:
a plurality of detection assemblies arranged along the target direction, wherein the plurality of detection assemblies comprise a plurality of first detection assemblies positioned in a first area and a plurality of second detection assemblies positioned in a second area, the distance between every two adjacent first detection assemblies is in a first distance range, the distance between every two adjacent second detection assemblies is in a second distance range, and the lower limit of the first distance range is larger than the upper limit of the second distance range;
each detection assembly is used for detecting local oscillator light emitted by a light source and reflected light of the local oscillator light reflected by a target object so as to generate a detection electric signal, the detection electric signal is used for indicating the distance between the target object and the detection module and/or the moving speed of the target object, and the local oscillator light is frequency-modulated continuous wave;
wherein the first region comprises two sub-regions, each of the sub-regions of the first region is provided with a plurality of the first detection assemblies, the second region is located between the two sub-regions, the plurality of the first detection assemblies in each of the sub-regions of the first region are arranged at equal intervals, the intervals of the first detection assemblies in the two sub-regions of the first region are different, the second region comprises a plurality of sub-regions, each of the sub-regions of the second region is provided with a plurality of the second detection assemblies, the plurality of the second detection assemblies in each of the sub-regions of the second region are arranged at equal intervals, the intervals of the second detection assemblies in the plurality of sub-regions of the second region are different, the number of the plurality of the second detection assemblies is greater than the number of the plurality of the first detection assemblies in each of the sub-regions, the probability of the second region that the detection assemblies detect the object in the region is greater than the probability of the first detection assemblies in the first region that the object is detected in the first region, and the detection object is the vehicle;
each detection assembly comprises a grating coupler, a balanced detector, a transimpedance amplifier and a filter, and the grating coupler, the balanced detector, the transimpedance amplifier and the filter are all integrated in the same chip;
wherein the grating coupler is used for coupling the reflected light to the balanced detector, and the grating coupler is an apodized grating coupler;
the balance detector is used for performing photoelectric conversion on interference light of the reflected light and the local oscillator light to generate detection current;
the transimpedance amplifier is used for converting the detection current into a detection voltage to serve as the detection electric signal;
the filter is connected with the transimpedance amplifier and is used for filtering the detection voltage output by the transimpedance amplifier;
each detection assembly further comprises an optical coupler, the grating coupler is used for coupling the reflected light into the silicon-based single-mode waveguide through the tapered waveguide, the reflected light is transmitted to the optical coupler through the silicon-based single-mode waveguide, the optical coupler is used for combining the local oscillator light and the reflected light, and the interference light obtained after the light combination is divided into two beams and then transmitted to the balance detector.
2. The detection module of claim 1, wherein the filter is a resistor-capacitor (RC) filter.
3. A laser ranging system, the system comprising: a light source, a detection module according to claim 1 or 2, and a signal processing component;
the light source is used for emitting local oscillation light, and the local oscillation light is frequency modulation continuous wave;
the signal processing assembly comprises a digital-to-analog converter and a digital signal processing circuit, and is used for processing the detection electric signal output by the detection module so as to determine the distance between the target object and the detection module and/or the moving speed of the target object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111670254.0A CN114325741B (en) | 2021-12-31 | 2021-12-31 | Detection module and laser ranging system |
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