CN208432734U - A kind of obstacle detector and robot based on infrared modulated - Google Patents
A kind of obstacle detector and robot based on infrared modulated Download PDFInfo
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- CN208432734U CN208432734U CN201820883814.8U CN201820883814U CN208432734U CN 208432734 U CN208432734 U CN 208432734U CN 201820883814 U CN201820883814 U CN 201820883814U CN 208432734 U CN208432734 U CN 208432734U
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Abstract
The utility model discloses a kind of obstacle detector and robot based on infrared modulated, the obstacle detector includes an infrared modulated detection module, the infrared modulated detection module includes structure qualification element 101, infrared transmitting tube 102 and infrared receiving terminal 110, infrared transmitting tube 102 and infrared receiving terminal 110 are set on structure qualification element at an angle each other, the transmitting visual angle of infrared transmitting tube 102 and the reception visual angle of infrared receiving terminal 110 intersect to form a closed detection zone 109, the infrared receiving terminal 110 reflects the modulated signal from the infrared transmitting tube for receiving barrier in the detection zone 109, to solve the problems, such as the detection of obstacles in limited area, improve the sensitivity of detection of obstacles.
Description
Technical field
The utility model relates to autonomous actions robotic technology fields, and in particular to a kind of barrier based on infrared modulated
Detection device and robot.
Background technique
With technology development and pursuit of the people to comfortably living, autonomous actions robot is more and more to enter people's life
In work, such as accompany robot, sweeping robot.The basic function of robot is environment sensing, command reception and behavior control
System.Robot difficult point is the perception of environment first, and robot needs to know which place can be gone, before have which barrier,
Whether side is wall etc..The perception of environment depends on the acquisition of various sensing datas, and common sensor includes: red at present
Outer light intensity sensor, infrared distance sensor, ultrasonic sensor, visual sensor, laser sensor etc..From precision
It sees, infrared distance sensor, ultrasonic sensor, laser sensor can obtain relatively high precision, but cost compares
Height, while the angle changing rate covered other than laser sensor is small, needs more number that can reduce the blind area of detection,
And laser sensor mainly perceives a very narrow two-dimensional surface, there are blind areas for vertical direction.Visual sensor is done if necessary
To ranging, then at least two cameras are needed, cost is relatively high, and precision is not good enough, and special hole is also required on mold to place.
Consider from cost with appearance, infrared light intensity sensor is undoubtedly the cheapest and most widely used.
The distant control function overwhelming majority of household electrical appliances is remotely controlled using infrared mode, and remote controler issues a string of infrared waves shapes,
Remotely-controlled equipment is reacted after receiving this string waveform.Infrared remote control generally uses the infrared ray of 940nm.Common infrared volume
Code agreement has ITT agreement, NEC agreement, Nokia NRC agreement, Sharp agreement, Philips RC-5 agreement, Philips
RC-6 agreement, Philips RECS-80 agreement and Sony SIRC agreement etc..The difference of these agreements can be attributed to and be made
Carrier frequency difference is different with coding.
Current robot is all based on the strong infrared detection barrier of monochromatic light, different materials to infrared transmitting not
Together, the surface of black cannot effectively be reflected, and cause the adaptability to barrier poor.
Utility model content
A kind of obstacle detector based on infrared modulated, including an infrared modulated detection module, the infrared modulated
Detection module includes structure qualification element, infrared transmitting tube and infrared receiving terminal, and infrared transmitting tube and infrared receiving terminal are in each other
At an angle is set on structure qualification element, and the transmitting visual angle of infrared transmitting tube and the reception visual angle of infrared receiving terminal intersect to form
One closed detection zone, the infrared receiving terminal come from the infrared hair for receiving barrier reflection in the detection zone
Penetrate the modulated signal of pipe.
Further, the center line of the infrared transmitting tube and the infrared receiving terminal forms a predetermined angle, so that
The detection zone is defined in the predetermined distance range immediately ahead of the structure qualification element.
Further, the predetermined distance range is set greater than 4 centimetres and less than 10 centimetre.
Further, emitting from the modulated signal of the infrared transmitting tube is the discontinuous pulses for being modulated into predeterminated frequency
String, the discontinuous pulses string are the carrier signal of predeterminated frequency and modulated signal phase based on infrared coding and obtain；
Wherein, the predeterminated frequency is to be determined by the infrared coding, and the infrared coding is the infrared receiver
The Signal coding agreement that head can identify.
Further, the predeterminated frequency is set as 38KHz or 40KHz.
A kind of robot, the robot are a kind of movable machine people, which is installed with one or more groups of described
Obstacle detector.
Compared with the existing technology, the utility model has the beneficial effects that the utility model is implemented by utilizing the red of low cost
Exterior part receives the modulated pulse signal of the barrier limited in response region a reflection to detect barrier, solves to limit area
Detection of obstacles problem in domain can detect the reflecting surface of black by way of modulated pulse signal, improve obstacle
The sensitivity of analyte detection.
Detailed description of the invention
Fig. 1 is the construction and light path schematic diagram of infrared modulated detection module provided by the embodiment of the utility model；
Fig. 2 is the control sequential figure of infrared modulated detection module provided by the embodiment of the utility model；
Fig. 3 is binary signal coding schematic diagram provided by the embodiment of the utility model, and Fig. 3 (a) is in binary signal
Logic ' 1 ' coding schematic diagram, Fig. 3 (b) be binary signal in logic ' 0 ' coding schematic diagram；
Fig. 4 is infrared signal modulation /demodulation schematic diagram provided by the embodiment of the utility model.
Specific embodiment
Specific embodiment of the present utility model is described further with reference to the accompanying drawing:
In the description of utility model, it is to be understood that term " center ", "front", "rear", "left", "right", " heavily fortified point
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on the figure or position
Relationship is set, description utility model is merely for convenience of and simplifies description, rather than indication or suggestion meaning device or element are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as the limitation to utility model.
As shown in Figure 1, the present embodiment provides a kind of obstacle detector based on infrared modulated, including an infrared tune
Detection module processed, the infrared modulated detection module include structure qualification element 101, infrared transmitting tube 102 and infrared receiving terminal
110, structure qualification element 101 is used as load carrier, red for fixing and being isolated infrared transmitting tube 102 and infrared receiving terminal 110
Outer transmitting tube 102 and infrared receiving terminal 110 are set on structure qualification element 101 in angle of intersection, pass through structure qualification member
Part 101 converges to the optical path of infrared transmitting tube 102 and infrared receiving terminal 110 on region 109.Optical path 105 and optical path 103 surround
The transmitting angular field of view of infrared transmitting tube 102, optical path 105 and optical path 103 are crossed to form the angle of departure of infrared transmitting tube 102,
104 indicate the center line of infrared transmitting tube 102；Optical path 106 and optical path 107 surround the reception visual angle model of infrared receiving terminal 110
It encloses, optical path 106 and optical path 107 are crossed to form the acceptance angle of infrared receiving terminal 110, and 108 indicate the center of infrared receiving terminals 110
Line.Region 109 indicate infrared transmitting tube transmitting visual angle and infrared receiving terminal intersect to form one of reception visual angle it is closed
The closed irregular figure that detection zone, i.e. optical path 105, optical path 103, optical path 106 and optical path 107 surround, the detection
The common field range that region is located at the light emitting region of infrared transmitting tube 102 and the range of receiving of infrared receiving terminal 110 intersects
Interior, the barrier reflection in the detection zone is stronger, and the light intensity that infrared receiving terminal 110 receives is also stronger.
In the detection zone 109 formed by the restriction effect of structure qualification element 101,110 energy of infrared receiving terminal
It enough receives barrier in detection zone 109 and reflects the IR modulated signals from the infrared transmitting tube 102；Wherein barrier is anti-
The signal penetrated is the modulated signal emitted from the infrared transmitting tube, that is, be transferred to the modulated signal of the infrared transmitting tube with
The signal that the carrier pulse of driving infrared emission is multiplied.
Preferably, the center line 108 of the center line 104 of the infrared transmitting tube 102 and the infrared receiving terminal 110 formation
One predetermined angle, so that the detection zone 109 is defined in the preset distance model in 101 front of structure qualification element
In enclosing, i.e. the minimum range in 101 front of detection zone 109 and the structure qualification element is h1 in Fig. 1, and maximum distance is
h2.Specifically, h1 is set as 4 centimetres, and h2 is set as 10 centimetres.The predetermined distance range is set greater than 4 centimetres and is less than
10 centimetres.
Preferably, the output power of the infrared transmitting tube is constant, and its watt level meets the infrared receiving terminal
Receive and demodulate the intensity requirement of the predetermined distance range internal reflection signal.Obstacle distance institute in the detection zone 109
State that infrared receiving terminal 110 is closer, the reception signal of the infrared receiving terminal 110 is stronger, when the two distance is less than anticollision distance
When can cause safety problem；Infrared receiving terminal 110 described in obstacle distance is remoter in the detection zone 109 (is greater than anticollision
Distance), the reception signal of the infrared receiving terminal 110 is weaker, when the center line 104 of the infrared transmitting tube 102 and described red
When the outer center line 108 for receiving head 110 is almost without intersection point, the reception signal of the infrared receiving terminal 110 can not be solved
It adjusts.Therefore need to limit a detection zone 109 in the predetermined distance range, then adjust the infrared transmitting tube 102
Output power carry out detection of obstacles so that barrier is reflected back the signal for being suitable for demodulating intensity in detection zone 109
To the infrared receiving terminal 110.The infrared transmitting tube 102 is according to the predetermined distance range during actually detected barrier
Size, set the output power of a stability number to meet and limit the infrared receiving terminal 110 in range and receive barrier
The intensity requirement for reflecting signal excludes the influence of other light pulses, improves detection effect, realizes low-power consumption detection.
Preferably, emitting from the signal of the infrared transmitting tube 102 is the discontinuous pulses string for being modulated into predeterminated frequency, should
Discontinuous pulses string is the carrier signal of predeterminated frequency and modulated signal phase based on infrared coding and obtain, wherein predeterminated frequency
It is to be determined by infrared coding, and infrared coding is the Signal coding agreement that the infrared receiving terminal 110 can identify.It is described
Predeterminated frequency is set as 38KHz or 40KHz, with meet the utility model implement the infrared receiving terminal 110 can identify it is red
Outer coding agreement.The conventional impulse modulation mode of the transmitting terminal use being connected with the infrared external reflection pipe 102 (such as pulse
Width modulated (PWM), the methods of pulse position modulation (PPM)), binary digital signal is modulated into the interruption arteries and veins of predeterminated frequency
Punching string, and infrared transmitting tube 102 is driven to send in the form of light pulse, i.e., it is carried by the carrier signal of predeterminated frequency
Recipient is sent to the modulated signal of information.Wherein, modulated signal interval is sent, and first sends one section of company with predeterminated frequency
Continuous pulse train, enters back into idle state, then sends one section of continuous impulse sequence with predeterminated frequency again, enters back into the free time
State, it is so alternate to send.
As one embodiment, the modulated signal is a kind of binary signal, as shown in figure 3, in Fig. 3 (a), two into
The pulse width of the low and high level signal of logic ' 1 ' in signal processed is equal to 0.26ms；In Fig. 3 (b), in binary signal
The pulse width of low level signal of logic ' 0 ' be equal to 0.52ms, the pulse width of high level signal is equal to 0.26ms.It needs
Illustrate, in different infrared codings, the corresponding duty ratio of logical zero and logical one is different in binary signal, i.e., corresponding
Low and high level signal pulse width ratio it is different.And in the utility model implementation, various common infrared remote codings
Agreement is suitable for the modulated signal.
Further, the light arteries and veins received is converted into electric signal by the infrared receiving terminal, using amplification, filtering etc.
Demodulator circuit is given after reason to be demodulated, and is exported after being reduced to binary digital signal.When the infrared receiving terminal receives tune
When signal processed, a low level is exported, a high level is otherwise exported, because of the infrared receiving terminal demodulated output signal and institute
The original transmitted signal for stating infrared transmitting tube is opposite.
Based on the obstacle detector, the utility model implementation provides a kind of obstacle detection method, the detection side
Method includes:
Realized by several duty cycles to the transmitting signal of the infrared transmitting tube 102 on the structure qualification element and
The control of the demodulated output signal of the infrared receiving terminal 110, then according to the reception signal of the infrared receiving terminal 110 come
Judge that whether there are obstacles in detection zone 109 defined by the structure qualification element 101.
Specifically, it in order to realize the detection function of modulated signal, needs to do corresponding timing to the infrared transmitting tube 102
Control, the demodulated output signal by detecting the infrared receiving terminal 110 judge that the structure qualification element is limited to realize
Detection zone 109 in whether there are obstacles.As shown in Fig. 2, figure middle and upper part is divided into the brewed of the infrared transmitting tube 102
Transmitting signal, figure middle-lower part is the demodulated output signal of the infrared receiving terminal 110.When the transmitting signal and the solution
Adjusting output signal, there are following pulse sequences can determine whether in the detection zone 109 there are barrier, wherein pulse sequence packet
It includes:
(1) between t0 moment and t1 moment, the infrared transmitting tube 102 emits the successive pulse groups of one section of predeterminated frequency,
Correspondingly, the infrared receiving terminal 110 receives the successive pulse groups of 109 internal reflection of detection zone, demodulated
Export low level；Wherein, the successive pulse groups are that the high level pulse of the modulated signal based on infrared coding is preset with described
The carrier signal phase of frequency with obtain, the infrared coding is the Signal coding agreement that the infrared receiving terminal can identify；
(2) between t1 moment and t2 moment, there is not train of pulse in the transmitting signal of the infrared transmitting tube 102, it should
Free time interval of the period as transmitting signal, correspondingly, the infrared receiving terminal 110 receives the detection zone
The transmitting signal of 109 internal reflections, demodulated output high level；
(3) the t2 moment, into next duty cycle；
(4) working sequence of the period at t2 moment to t3 moment repeats step (1), the time at t3 moment to t4 moment
The working sequence of section repeats step (2), then enters next but one duty cycle, such iteration, so that described red at the t4 moment
It is brewed that outer reception head 110 persistently receives emitting from the infrared transmitting tube 102 for 109 internal reflection of detection zone
Infrared signal；The 102 repeated work timing (1) to (4) of infrared transmitting tube, constantly transmitting modulated signal, and at barrier
In brewed infrared signal can be reflected in the detection zone 109, the infrared receiving terminal 110 is persistently received
Reflect signal.
Wherein the successive pulse groups of predeterminated frequency are the binary signal for loading the coding of carrier signal, and described infrared are connect
The reflection signal that receipts head 110 receives is that a part of the entire barrier or barrier in the detection zone 109 is anti-
Penetrate face.
When above-mentioned pulse sequence is not present in the demodulated output signal of the infrared receiving terminal 110, the detection zone 109 is not
There are barriers.
Preferably, the predeterminated frequency be modulated according to the frequency adaptation characteristic of the infrared receiving terminal 110 come, with
Meet the requirement of common infrared coding agreement.Specifically, infrared light can be made with specific frequency scintillation by modulation, it is described
Infrared receiving terminal 110 can be adapted to this frequency, other noise signals are all ignored.The different of carrier wave are modulated according to transmitting terminal to select
The reception head of corresponding frequency, demodulation frequency.In the utility model embodiment, the predeterminated frequency is set as 38KHz or 40KHz.
Preferably, the transmitting signal of the infrared transmitting tube 102 is the modulated discontinuous pulses string that the predeterminated frequency is made,
The free time interval in the discontinuous pulses string is according to the fixation idling cycle between the carrier signal of the predeterminated frequency
Determining, the modulated signal is the encoded signal based on infrared coding, and the numerical value of the fixed idling cycle is also by described red
The related protocol of outer coding determines.It is separated between the carrier pulse using the fixed idling cycle, to indicate logic
" 0 ", and the discontinuous pulses string is the load for being transferred to the modulated signal and driving infrared emission of the infrared transmitting tube 102
Wave signal phase with obtain.
As a kind of embodiment of the utility model, infrared signal is modulated with pulse width modulation (PWM), pulse position
The methods of modulation (PPM) is set, so that carrier frequency is adjustable.Pulsewidth modulation is used in the present embodiment.Binary modulation is by leading
Chip is controlled to complete, it is modulated into the binary signal after coding the discontinuous pulses string that frequency is 38KHz, this discontinuous pulses
String is the modulated signal sent for the infrared transmitting tube 102.As shown in figure 4, waveform A is the coding wave of binary signal
Shape, waveform B are the successive pulse groups (being equivalent to carrier signal) that frequency is 38KHz (period is about 26us), binary signal
In coding waveforms A the pulse width of the low and high level of logical one be equivalent to 10 pulses in successive pulse groups B time it is wide
Degree；And the low level pulse width of logical zero is equivalent to the time width of 20 pulses in successive pulse groups B, high level
Pulse width be equivalent to the time widths of 10 pulses in successive pulse groups B.Waveform C be it is modulated after discontinuous pulses
String, is the signal for transmission, the transmitting signal corresponding to Fig. 2.
As shown in figure 4, binary data pending is 101, when there are when barrier, then in the detection zone 109
The modulated signal that the infrared transmitting tube 102 is sent is reflected to the infrared receiving terminal 110, the solution of corresponding binary signal
The signal (the waveform D in Fig. 4) received by the infrared receiving terminal 110 is adjusted through inter-process and demodulates recovery, output figure
Waveform E (waveform A's negates in exactly Fig. 4) in 4, i.e., the demodulation of the described infrared receiving terminal can be regarded as: in input pulse
Low level is exported when string, otherwise exports high level.Binary decoding is completed by main control chip, it sends infrared receiving terminal
Binary coding waveform by decoding, be reduced into the binary data that the infrared transmitting tube is sent.Such as Fig. 4, waveform E is solved
Code is reduced into data information 101, may determine that show that there are barriers in the detection zone 109 at this time.
Preferably, the infrared transmitting tube 102 is in the detection zone 109 at a distance from the structure qualification element 101
The power of output constant intensity in range, so that the infrared receiving terminal 110 can only receive obstacle in the detection zone 109
The transmitting signal of object reflection；Wherein, the detection zone 109 and the distance range of the structure qualification element 101 are big
In 4 centimetres less than 10 centimetres.The minimum range of detection zone 109 as shown in Figure 1 and 101 front of structure qualification element
For h1, maximum distance h2.Specifically, h1 is set as 3 centimetres, and h2 is set as 8 centimetres.The infrared transmitting tube 102 is according to reality
The size of the predetermined distance range during barrier is detected on border, sets the output power of a stability number to meet and limit
The infrared receiving terminal 110 receives the intensity requirement of barrier reflection signal in range.
During atual detection, entire barrier is located at the 101 front detection zone of structure qualification element
Region except 109, as shown in Figure 1, being divided into two kinds of embodiments.Embodiment one, when barrier is located at optical path 105 and optical path 103
When surrounding the region #1 in the light emitting region of infrared transmitting tube 102 except the detection zone 109, region #1 is not in optical path 106
Surrounded in the reception angular field of view of infrared receiving terminal 110 with optical path 107, due to the infrared transmitting tube 102 output power and
The limitation of the detection zone, the infrared receiving terminal 110 almost do not receive the reflection signal of the barrier in the #1 of region or connect
Extremely weak signal is received so that it cannot demodulated output signal.
Embodiment two, when barrier is located at institute in the range of receiving that optical path 107 and optical path 106 surround infrared receiving terminal 110
The region #2 except detection zone 109 is stated, region #2 does not surround the transmitting view of infrared receiving terminal 110 in optical path 103 and optical path 105
Exceed the pre-determined distance range in angular region and at a distance from 101 front of structure qualification element, due to described infrared
The limitation of the output power of transmitting tube 102 and the pre-determined distance, barrier is received from infrared transmitting tube 102 in the #2 of region
Modulated signal is very weak, and hardly reflection transmitting is from the modulated signal of the infrared transmitting tube, and the infrared receiving terminal
110 receive extremely weak signal so that it cannot demodulation output corresponding signal.
It can be installed on a kind of movable machine people based on obstacle detector above-mentioned, general detection of obstacles meeting
There are 6 groups, be evenly distributed in the front of robot, for detecting the position of the barrier in the mobile robot periphery limited area
It sets.Certain mobile robot is not excluded for including other mechanisms and functional module.
Above embodiments are only sufficiently open rather than limitation the utility model, it is all conceived based on the utility model and without
The range that utility model is covered should belong in the replacement for the equivalence techniques feature that creative work can be obtained.
Claims (6)
1. a kind of obstacle detector based on infrared modulated, including an infrared modulated detection module, infrared modulated inspection
Surveying module includes structure qualification element, infrared transmitting tube and infrared receiving terminal, and infrared transmitting tube and infrared receiving terminal are in folder each other
It is set to angle on structure qualification element, which is characterized in that the transmitting visual angle of infrared transmitting tube and the reception of infrared receiving terminal regard
Angle intersects to form a closed detection zone, and the infrared receiving terminal comes from for receiving barrier reflection in the detection zone
The modulated signal of the infrared transmitting tube.
2. obstacle detector according to claim 1, which is characterized in that the infrared transmitting tube and the infrared receiver
The center line of head forms a predetermined angle, makes a reservation for so that the detection zone is defined in immediately ahead of the structure qualification element
In distance range.
3. obstacle detector according to claim 2, which is characterized in that the predetermined distance range is set greater than 4
Centimetre and less than 10 centimetres.
4. obstacle detector according to claim 1, which is characterized in that emit from the brewed of the infrared transmitting tube
Signal is the discontinuous pulses string for being modulated into predeterminated frequency, which is the carrier signal of predeterminated frequency and is based on infrared
The modulated signal phase of coding with obtain；
Wherein, the predeterminated frequency is to be determined by the infrared coding, and the infrared coding is the infrared receiving terminal institute
The Signal coding agreement that can be identified.
5. obstacle detector according to claim 4, which is characterized in that the predeterminated frequency be set as 38KHz or
40KHz。
6. a kind of robot, which is a kind of movable machine people, which is characterized in that the robot be installed with one group or
Any one of the multiple groups claim 1-5 obstacle detector.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983246A (en) * | 2018-08-03 | 2018-12-11 | 珠海市微半导体有限公司 | A kind of obstacle detector of infrared modulated, detection method and robot |
| CN109031325A (en) * | 2018-06-08 | 2018-12-18 | 珠海市微半导体有限公司 | A kind of obstacle detector based on infrared modulated, detection method and robot |
| CN111766607A (en) * | 2019-03-13 | 2020-10-13 | 科沃斯机器人股份有限公司 | Self-moving equipment and non-contact obstacle detection device |
-
2018
- 2018-06-08 CN CN201820883814.8U patent/CN208432734U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031325A (en) * | 2018-06-08 | 2018-12-18 | 珠海市微半导体有限公司 | A kind of obstacle detector based on infrared modulated, detection method and robot |
| CN108983246A (en) * | 2018-08-03 | 2018-12-11 | 珠海市微半导体有限公司 | A kind of obstacle detector of infrared modulated, detection method and robot |
| CN111766607A (en) * | 2019-03-13 | 2020-10-13 | 科沃斯机器人股份有限公司 | Self-moving equipment and non-contact obstacle detection device |
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