CN106276533B - The method and apparatus for controlling light curtain - Google Patents

The method and apparatus for controlling light curtain Download PDF

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Publication number
CN106276533B
CN106276533B CN201610887964.1A CN201610887964A CN106276533B CN 106276533 B CN106276533 B CN 106276533B CN 201610887964 A CN201610887964 A CN 201610887964A CN 106276533 B CN106276533 B CN 106276533B
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distance
electric signal
point
light curtain
receiving
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CN106276533A (en
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刘贤钊
黄立明
张彩霞
薄明心
李基源
黄丹燕
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Hitachi Building Technology Guangzhou Co Ltd
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Hitachi Building Technology Guangzhou Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
    • B66B13/24—Safety devices in passenger lifts, not otherwise provided for, for preventing trapping of passengers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions

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  • Optical Communication System (AREA)
  • Curtains And Furnishings For Windows Or Doors (AREA)
  • Power-Operated Mechanisms For Wings (AREA)

Abstract

The present invention relates to a kind of method and apparatus for controlling light curtain, this method includes：Obtain the distance between transmitting terminal and receiving terminal；If the distance is less than preset distance threshold, the launch point and receiving point of more than two group of number are opened simultaneously；Acquire the electric signal that the receiving point that the receiving terminal is opened receives launch point transmitting signal；Judge that the signal strength of the electric signal of the acquisition whether less than corresponding electric signal threshold value, if the signal strength of at least one electric signal is less than corresponding electric signal threshold value, judges that the light curtain is blocked respectively；The present invention is less than preset distance threshold when the transmitting terminal of elevator light curtain and the distance of receiving terminal, opens simultaneously the launch point and receiving point of more than two group of number, and in the case where the number of combinations of launch point and receiving point is certain, the total scanning time of light curtain reduces.

Description

The method and apparatus for controlling light curtain
Technical field
The present invention relates to light curtain control field, more particularly to the method and apparatus of control light curtain.
Background technology
Light curtain is made of transmitting terminal, receiving terminal.Transmitting terminal has several launch points, and receiving terminal has several light-sensitive devices (hereinafter referred to as receiving point) receives from the light that launch point is sent out by the receiving point of receiving terminal, is then converted to electric signal.Light curtain is according to one Fixed sequence opens transmitting terminal and receiving terminal (being each combined as a pair of of transmitting receiving point) one by one, is received if each combination is lower End can receive the optical signal of transmitting terminal, then it is assumed that light curtain is not blocked, if the lower receiving terminal of some combinations does not receive To the optical signal of transmitting terminal, then it is assumed that light curtain is blocked.Because a pair of of combination, scan period may only be opened each time It is：Total scanning time=(simple scan time+sweep interval) * number of combinations.With the development of light curtain product, in order to reduce Light curtain blind area (will not block launch point and the minimum diameter of receiving point), and the number of launch point and receiving point is more and more, Cause number of combinations also more and more, total scanning time (scan period) is increasingly longer, this reduces the sweep speed of light curtain instead.
Under normal circumstances, when elevator, light curtain is blocked in door closing procedure, the master blocked signal and be sent to elevator of light curtain After controller (hereinafter referred to as master control), master control command gate machine controller (hereinafter referred to as door machine) stops closing the door and counter opening.Work as light curtain Sweep time extend, from light curtain be blocked to door machine stop close the door time equally extend, this causes door machine to be hidden from light curtain The distance that door is run during door phase down is kept off to extend.This can reduce user experience, while increase the wind that door hits passenger Danger.
Invention content
Based on this, a kind of method and apparatus for controlling light curtain are provided, to overcome the problems, such as that the total scanning time of light curtain is long.
A kind of method for controlling light curtain, including：Obtain the distance between transmitting terminal and receiving terminal；If the distance is less than pre- If distance threshold, open simultaneously the launch point and receiving point of more than two group of number；Acquire the receiving point that the receiving terminal is opened Receive the electric signal of launch point transmitting signal；Judge the signal strength of the electric signal of the acquisition whether less than corresponding electricity respectively Signal threshold value if the signal strength of at least one electric signal is less than corresponding electric signal threshold value, judges that the light curtain is hidden Gear.
For prior art problem, the invention also provides a kind of device for controlling light curtain, including：
Apart from acquisition module, light path starting module, acquisition module and judgment module；It is described apart from acquisition module, for obtaining Take the distance between transmitting terminal and receiving terminal；The light path starting module, for judging that it is preset apart from threshold that the distance is less than Value opens simultaneously the launch point and receiving point of more than two group of number；The acquisition module, for acquiring the receiving terminal opening Receiving point receives the electric signal of launch point transmitting signal；The judgment module, for judging the electric signal of the acquisition respectively Whether signal strength is less than corresponding electric signal threshold value, if the signal strength of at least one electric signal is less than corresponding electric signal Threshold value then judges that the light curtain is blocked.
Beneficial effects of the present invention are：When the transmitting terminal of elevator light curtain and the distance of receiving terminal are less than preset apart from threshold Value opens simultaneously the launch point and receiving point of more than two group of number, in the case where the number of combinations of launch point and receiving point is certain, The total scanning time of light curtain reduces.
Description of the drawings
Fig. 1 is the schematic flow chart of the method for the control light curtain of an embodiment；
Fig. 2 is the determining and the corresponding voltage threshold of the distance between transmitting terminal and receiving terminal schematic of an embodiment Flow chart；
Fig. 3 is the light curtain launch point of Fig. 2 embodiments and the schematic diagram of the syntagmatic of receiving point；
Fig. 4 is curve graph of the ratio of gains in Fig. 2 embodiments with the variation of distance between transmitting terminal and receiving terminal；
Fig. 5 is the schematic diagram of the device of the control light curtain of an embodiment.
Specific embodiment
In order to further illustrate the effect of the technological means of the invention taken and acquirement, below in conjunction with the accompanying drawings and preferably Embodiment to technical scheme of the present invention, carries out clear and complete description.
Utilization light curtain switch gate in the present invention can have multiple application scenarios, for example, elevator door, subway door etc..Below Embodiment is illustrated by taking elevator light curtain as an example.
Fig. 1 is the schematic flow chart of the method for the control light curtain of an embodiment.As shown in Figure 1, the method for control light curtain, Including：
S101 obtains the distance between transmitting terminal and receiving terminal.
The distance between transmitting terminal and receiving terminal of elevator light curtain；Because the transmitting terminal of light curtain, receiving terminal arrive light curtain respectively Filter has certain distance between surface, so even if when door is closed, the distance between transmitting terminal and receiving terminal of light curtain are not yet It is 0.
S102 if the distance is less than preset distance threshold, opens simultaneously launch point and the reception of more than two group of number Point.
As a preferred embodiment, if the distance is less than the first distance threshold, opens simultaneously the launch point of m groups and connect It receives；If the distance is less than second distance threshold value, launch point and the reception of n groups are opened simultaneously；First distance threshold is more than Second distance threshold value, m is less than n, and m >=2, m, n are integer, if the distance is more than all preset distance thresholds, One group of launch point and receiving point are only opened every time, for example, when the distance of receiving terminal and transmitting terminal is 0.8m, open simultaneously two groups Launch point and receiving point；When the distance of receiving terminal and transmitting terminal is 0.5m, four groups of launch points and receiving point are opened simultaneously, in this way Launch point and receiving point always organize number it is certain in the case of, all receiving points can be scanned through faster.
S103 acquires the electric signal that the receiving point that the receiving terminal is opened receives launch point transmitting signal.
As a preferred embodiment, the electric signal is voltage signal, the electricity of all receiving points that acquisition receiving terminal is opened Pressure, the voltage of the receiving point are calculated by following formula：
U=Econst (1)
Wherein, U is the voltage of the receiving point, and E is the reception power of receiving point, and const is circuit constant.
Whether S104 judges the signal strength of electric signal of the acquisition less than corresponding electric signal threshold value, if extremely respectively Few signal strength there are one electric signal then judges that the light curtain is blocked less than corresponding electric signal threshold value.
If opening simultaneously two groups of launch points and receiving point, as long as the signal strength there are one the electric signal acquired is less than correspondence Electric signal threshold value, then judge that the light curtain is blocked.For example, if four groups of launch points and receiving point are opened simultaneously, as long as having one The signal strength of the electric signal of a acquisition is less than corresponding electric signal threshold value, then judges that the light curtain is blocked, light curtain is blocked After signal is sent to the master controller of elevator, master controller commands door machine controller stops closing the door and counter opening.If all acquisitions The signal strength of electric signal is higher than corresponding electric signal threshold value, then judges that the light curtain is not blocked, then elevator door continues to close It closes.
Before step S104, the predetermined and corresponding electric signal threshold of the distance between transmitting terminal and receiving terminal is needed Value；It is predetermined and the corresponding electric signal threshold value of the distance between transmitting terminal and receiving terminal as a preferred embodiment Realization method can be：The distance between transmitting terminal and receiving terminal are set, receiving point is acquired under the distance condition and is not hidden The electric signal with group launch point transmitting signal is received during gear；It is determined by the electric signal described apart from corresponding first intermediate telecommunication Number；And by the electric signal, it is described determine apart from the corresponding ratio of gains it is described apart from corresponding intermediate telecommunication No. second；According to institute It states intermediate telecommunication No. the first and intermediate telecommunication No. the second is determining described apart from corresponding electric signal threshold value；
Wherein, further include it is determining it is described apart from the corresponding ratio of gains the step of：Obtain the transmission power of launch point；Described Receiving point reception is obtained under distance condition and receives power, the launch point transmitting of reception adjacent sets with the first of group launch point transmitting signal The second of signal receives power；Described first is received the first power under power divided by the transmission power acquisition distance condition Gain receives the second power gain under power divided by the transmission power acquisition distance condition by described second；By described One power gain divided by the second reception power obtain described apart from the corresponding ratio of gains.
The present embodiment has the beneficial effect that：When the transmitting terminal of elevator light curtain and the distance of receiving terminal are less than preset apart from threshold Value opens simultaneously the launch point and receiving point of more than two group of number, in the case where the number of combinations of launch point and receiving point is certain, The total scanning time of light curtain reduces, and light curtain is blocked to door machine, and to stop the time closing the door short, improves user experience.
The electric signal of light curtain receiving point can be current signal or voltage signal, can also be other forms Electric signal, following embodiment are illustrated with voltage signal.
Fig. 2 is the determining and the corresponding voltage threshold of the distance between transmitting terminal and receiving terminal schematic of an embodiment Flow chart, Fig. 3 are the light curtain launch point of Fig. 2 embodiments and the schematic diagram of the syntagmatic of receiving terminal.As shown in Fig. 2, in advance really The step of fixed and the distance between transmitting terminal and receiving terminal corresponding voltage threshold, includes：
S201, setting the distance between transmitting terminal and receiving terminal L0, receiving point T is acquired under the distance conditionnNot by It is received when blocking with group launch point RnEmit the electric signal of signal.
S202 is determined described apart from corresponding first medium voltage U by the voltagef。
As a preferred embodiment, the first medium voltage U is determined by following formulaf：
Uf=k1·Umax (2)
Wherein, k1Be value range be (0,1) constant, UmaxIt is to be received when receiving point is not blocked with group launch point Emit the voltage of signal.
S203 obtains the transmission power E of launch point0；Receiving point R is obtained under the distance conditionnIt receives with group launch point TnEmit signal first receives power Enn, receive adjacent sets launch point TmEmit signal second receives power Emn。
As a preferred embodiment, the relationship for receiving power and transmission power is as follows：
Wherein,E0The transmission power of launch point, E is the reception power of receiving point, l be transmitting terminal and The distance between receiving terminal.
S204 receives power E by described firstnnDivided by transmission power E0The first power obtained under the distance condition increases Beneficial Cnn, power E is received by described secondmnDivided by transmission power E0Obtain the second power gain C under the distance conditionmn。
As a preferred embodiment, the first power gain is calculated by (4)~(7) formula：
According to Pythagorean theorem：
It is obtained by formula (4)~(7),
Second power gain is calculated by (8)~(11) formula：
According to Pythagorean theorem：
It is obtained by formula (8)~(11),
Wherein, E0It is the transmission power of launch point, EnnIt is that receiving point receives the first reception with group launch point transmitting signal Power, EmnIt is that receiving point receives the second reception power that adjacent sets launch point emits signal, CnnIt is the first power gain, CmnIt is Second power gain, L0It is the distance of light curtain transmitting terminal and receiving terminal, LnnIt is receiving point and organizes the distance between launch point, L togethermn It is the distance between receiving point and adjacent sets launch point, α is the folder of the line and trunnion axis between receiving point and same group launch point Angle, β are the angles of the line and trunnion axis between receiving point and adjacent sets launch point, and P is the distance of two adjacent launch points, and Q is same The vertical range of group launch point and receiving point.
S205, by the first power gain CnnDivided by second receive power CmnIt obtains described apart from the corresponding ratio of gains
It is described to be apart from the corresponding ratio of gains as a preferred embodiment：
S206, by the voltage, it is described determine apart from the corresponding ratio of gains it is described apart from corresponding second medium voltage；Root It is determined according to first medium voltage and the second medium voltage described apart from corresponding threshold voltage；
As a preferred embodiment, the second medium voltage U is determined by following formulaf' be：
It is determined by following formula described apart from corresponding threshold voltage：
Wherein, k2Be with described apart from the corresponding ratio of gains,
Known P, Q can make the ratio of gains according to ratio of gains formula (12)With between light curtain transmitting terminal and receiving terminal Distance change curve graph, as shown in Figure 4.For example, work as L0During less than 460mm, it is more than 10 with the ratio between gain of group, considers single One group of receiving point and the situation of launch point are solely opened, if the condition for judging to be blocked between receiving point and launch point at this time is adopts The voltage U of collectionnLess than threshold voltage Uff, the first medium voltage UfVoltage U during with not blockingmaxBetween relationship can be:
Uf=0.5*Umax
First medium voltage UfVoltage U during with not blockingmaxBetween relationship can be:
Uf'=0.1*Umax
So, when opening simultaneously two groups of launch point and launch point, it is desirable to by UffIt is set as:
Uff=0.5*Umax+0.1*Umax=0.6*Umax。
It should be noted that when the distance between transmitting terminal and receiving terminal are less than a certain preset distance threshold, Ke Nengtong When open three groups or more group number launch points and receiving point；If opening simultaneously three groups or more, need to only calculate not at edge One group by other two groups that clamp it influenced, it is believed that be single group influence twice, if far apart, due to neighbour The ratio of gains of group single group has been 20:1 (the distance between transmitting terminal and receiving terminal be 460mm when, it is exactly 10 that two groups, which add up,: 1), that gain for separating one group again will be more much smaller, therefore can ignore non-adjacent group of influence.
The present embodiment is by calculating the ratio of gainsWith light curtain transmitting terminal and the expression formula of the distance of receiving terminal, a system is obtained Row yield value corresponding with the distance of light curtain transmitting terminal and receiving terminal.When obtain determining light curtain transmitting terminal and receiving terminal away from From according to its corresponding yield value, predefining and the corresponding voltage threshold of the distance between transmitting terminal and receiving terminal.
Based on the thought identical with the method for the control light curtain in above-described embodiment, the present invention also provides the dresses of control light curtain It puts.For convenience of description, it in the structure diagram for controlling the device embodiment of light curtain, illustrate only and phase of the embodiment of the present invention The part of pass, it will be understood by those skilled in the art that the restriction of schematic structure not structure twin installation, can be included than illustrating more More or less components either combines certain components or different components arrangement.
Fig. 5 is the schematic diagram of the device of the control light curtain of an embodiment.As shown in figure 5, the device of control light curtain, Including：Apart from acquisition module 100, light path starting module 200, acquisition module 300 and judgment module 400；The distance obtains mould Block 100, for obtaining the distance between transmitting terminal and receiving terminal；The light path starting module 200, it is described apart from small for judging In preset distance threshold, the launch point and receiving point of more than two group of number are opened simultaneously；The acquisition module 300, for adopting Collect the electric signal that the receiving point that the receiving terminal is opened receives launch point transmitting signal；The judgment module 400, for sentencing respectively Whether the signal strength of the electric signal of the disconnected acquisition is less than corresponding electric signal threshold value, if the signal of at least one electric signal Intensity is less than corresponding electric signal threshold value, then judges that the light curtain is blocked.
As a preferred embodiment, the device of the control light curtain further includes：Electric signal threshold determination module is (in figure not It marks)；The electric signal threshold determination module, for predefining and the corresponding electricity of the distance between transmitting terminal and receiving terminal Signal threshold value.
As a preferred embodiment, electric signal threshold determination module includes：Collecting unit (does not mark) in figure, for setting The distance between transmitting terminal and receiving terminal are acquired under the distance condition and are received when receiving point is not blocked with group launch point Emit the electric signal of signal；First intermediate telecommunication determination unit (not marked in figure), it is described for being determined by the electric signal Apart from corresponding intermediate telecommunication No. first；Second intermediate telecommunication determination unit (not marked in figure), for by the electric signal, It is described determined apart from the corresponding ratio of gains it is described apart from corresponding intermediate telecommunication No. second；Electric signal threshold value determination unit is (in figure Do not mark), it is described apart from corresponding electric signal threshold for being determined according to the intermediate telecommunication No. first and intermediate telecommunication No. the second Value；Wherein, ratio of gains determination unit (not marked in figure), for obtaining the transmission power of launch point, under the distance condition Obtain the same group launch point transmitting signal of receiving point reception first receives power, reception adjacent sets launch point emits the second of signal Power is received, the described first reception power divided by transmission power are obtained to the first power gain under the distance condition, by institute The second power gain under the second reception power divided by the transmission power acquisition distance condition is stated, by first power gain Divided by second reception power obtain it is described apart from the corresponding ratio of gains.
As a preferred embodiment, the electric signal is voltage signal, and the first intermediate telecommunication determination unit passes through following formula Calculate the first medium voltage Uf：
Uf=k1·Umax
Wherein, k1Be value range be (0,1) constant, UmaxIt is to be received when receiving point is not blocked with group launch point Emit the voltage of signal；
Second intermediate telecommunication determination unit calculates the second medium voltage U by following formulaf' be：
Wherein, k2Be with described apart from the corresponding ratio of gains,
The present embodiment has the beneficial effect that：When the transmitting terminal of elevator light curtain and the distance of receiving terminal are less than preset apart from threshold Value opens simultaneously the launch point and receiving point of more than two group of number, in the case where the number of combinations of launch point and receiving point is certain, Judge that the number whether light curtain is blocked is reduced, the total scanning time of light curtain reduces, and light curtain is blocked stops what is closing the door to door machine Time is short, improves user experience.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, it is all considered to be the range of this specification record.
Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that those of ordinary skill in the art are come It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (10)

  1. A kind of 1. method for controlling light curtain, which is characterized in that including：
    Obtain the distance between transmitting terminal and receiving terminal；
    If the distance is less than preset distance threshold, the launch point and receiving point of more than two group of number are opened simultaneously；
    Acquire the electric signal that the receiving point that the receiving terminal is opened receives launch point transmitting signal；
    The signal strength of the electric signal of the acquisition is judged respectively whether less than corresponding electric signal threshold value, if at least one is electric The signal strength of signal is less than corresponding electric signal threshold value, then judges that the light curtain is blocked.
  2. 2. the method for control light curtain according to claim 1, which is characterized in that further include：Predefine and transmitting terminal and The corresponding electric signal threshold value of the distance between receiving terminal.
  3. 3. the method for control light curtain according to claim 2, which is characterized in that predefine and transmitting terminal and receiving terminal it Between distance corresponding electric signal threshold value the step of include：
    The distance between transmitting terminal and receiving terminal are set, acquires when receiving point is not blocked and is received together under the distance condition The electric signal of group launch point transmitting signal；
    It is determined by the electric signal described apart from corresponding intermediate telecommunication No. first；It is and corresponding by the electric signal, the distance The ratio of gains determine it is described apart from corresponding intermediate telecommunication No. second；According to the intermediate telecommunication No. first and the second intermediate telecommunication Number determine with described apart from corresponding electric signal threshold value；
    Wherein, be additionally included in the case that receiving point is not blocked determine it is described apart from the corresponding ratio of gains the step of：
    Obtain the transmission power of launch point；
    Receiving point reception is obtained under the distance condition and receives power, reception adjacent sets with organize launch point transmitting signal first The second of launch point transmitting signal receives power；
    Described first reception power divided by transmission power are obtained to the first power gain under the distance condition, by described second Receive the second power gain under power divided by the transmission power acquisition distance condition；
    First power gain divided by the second reception power are obtained described apart from the corresponding ratio of gains.
  4. 4. the method for control light curtain according to claim 3, which is characterized in that the electric signal is voltage signal, described Intermediate telecommunication No. first is the first medium voltage Uf, the intermediate telecommunication No. second is the second medium voltage Uf', it is true by following formula The fixed first medium voltage Uf：
    Uf=k1·Umax
    Wherein, k1Be value range be (0,1) constant, UmaxIt is to be received when receiving point is not blocked with group launch point transmitting letter Number voltage；
    The second medium voltage U is determined by following formulaf' be：
    Wherein, k2Be with described apart from the corresponding ratio of gains,
  5. 5. the method for control light curtain according to claim 1, which is characterized in that if the distance is less than preset apart from threshold Value, the launch point and receiving point for opening simultaneously more than two group of number include：
    If the distance is less than the first distance threshold, launch point and the reception of m groups are opened simultaneously；
    If the distance is less than second distance threshold value, launch point and the reception of n groups are opened simultaneously；
    First distance threshold is more than second distance threshold value, and m is less than n, and m >=2, m, n are integer.
  6. 6. the method for control light curtain according to claim 3, which is characterized in that the voltage of the receiving point passes through following formula meter It calculates：
    U=Econst
    Wherein, U is the voltage of the receiving point, and E is the reception power of receiving point, and const is circuit constant.
  7. 7. a kind of device for controlling light curtain, which is characterized in that including：Apart from acquisition module, light path starting module, acquisition module and Judgment module；
    It is described apart from acquisition module, for obtaining the distance between transmitting terminal and receiving terminal；
    The light path starting module for judging that the distance is less than preset distance threshold, opens simultaneously more than two group of number Launch point and receiving point；
    The acquisition module, for acquiring the electric signal that the receiving point that the receiving terminal is opened receives launch point transmitting signal；
    The judgment module, for judging the signal strength of the electric signal of the acquisition whether less than corresponding electric signal threshold respectively Value if the signal strength of at least one electric signal is less than corresponding electric signal threshold value, judges that the light curtain is blocked.
  8. 8. the device of control light curtain according to claim 7, which is characterized in that further include：Electric signal threshold determination module；
    The electric signal threshold determination module, for the predetermined and corresponding telecommunications of the distance between transmitting terminal and receiving terminal Number threshold value.
  9. 9. the device of control light curtain according to claim 8, which is characterized in that electric signal threshold determination module includes：
    Collecting unit, for setting the distance between transmitting terminal and receiving terminal, acquisition receiving point does not have under the distance condition The electric signal with group launch point transmitting signal is received when being blocked；
    First intermediate telecommunication determination unit, it is described apart from corresponding intermediate telecommunication No. first for being determined by the electric signal；
    Second intermediate telecommunication determination unit, for by the electric signal, described determine the distance apart from the corresponding ratio of gains Corresponding intermediate telecommunication No. second；
    Electric signal threshold value determination unit, for determining the distance according to the intermediate telecommunication No. first and intermediate telecommunication No. the second Corresponding electric signal threshold value；
    Wherein, electric signal threshold determination module further includes：
    Ratio of gains determination unit, for obtaining the transmission power of launch point；
    Receiving point reception is obtained under the distance condition and receives power, reception adjacent sets with organize launch point transmitting signal first The second of launch point transmitting signal receives power；
    Described first reception power divided by transmission power are obtained to the first power gain under the distance condition, by described second Receive the second power gain under power divided by the transmission power acquisition distance condition；
    First power gain divided by the second reception power are obtained described apart from the corresponding ratio of gains.
  10. 10. the device of control light curtain according to claim 9, which is characterized in that the electric signal is voltage signal, described Intermediate telecommunication No. first is the first medium voltage Uf, the intermediate telecommunication No. second is the second medium voltage Uf',
    First medium voltage determination unit calculates the first medium voltage U by following formulaf：
    Uf=k1·Umax
    Wherein, k1Be value range be (0,1) constant, UmaxIt is to be received when receiving point is not blocked with group launch point transmitting letter Number voltage；
    Second medium voltage determination unit calculates the second medium voltage U by following formulaf' be：
    Wherein, k2Be with described apart from the corresponding ratio of gains,
CN201610887964.1A 2016-10-11 2016-10-11 The method and apparatus for controlling light curtain Active CN106276533B (en)

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CN109110601B (en) * 2017-06-23 2021-12-24 奥的斯电梯公司 Determination of passenger movement relative to elevator car
CN108059068B (en) * 2017-12-12 2019-07-12 日立楼宇技术（广州）有限公司 Light curtain detection threshold value generation method, device and system
CN111196523A (en) * 2020-01-13 2020-05-26 深圳市意普兴科技有限公司 Infrared centering light curtain of rectifying
CN112564812B (en) * 2020-11-25 2022-07-22 上海长江电气设备集团有限公司 Pulse signal modulation and demodulation method, light curtain receiver, transmitter and storage medium

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WO2004058622A1 (en) * 2002-12-30 2004-07-15 Otis Elevator Company Optically synchronized safety detection device for elevator sliding doors
CN201102852Y (en) * 2007-08-17 2008-08-20 宁波微科光电有限公司 Automatic dormancy and awakening controller of infrared light curtain
CN202897756U (en) * 2012-11-05 2013-04-24 宁波微科光电有限公司 Elevator light curtain with selective scanning beam modes
CN105947851B (en) * 2016-06-15 2018-09-21 日立楼宇技术（广州）有限公司 Block analyte detection, elevator door control method and system

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