JP2004306902A - Crossing obstruction detector - Google Patents

Crossing obstruction detector Download PDF

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Publication number
JP2004306902A
JP2004306902A JP2003106326A JP2003106326A JP2004306902A JP 2004306902 A JP2004306902 A JP 2004306902A JP 2003106326 A JP2003106326 A JP 2003106326A JP 2003106326 A JP2003106326 A JP 2003106326A JP 2004306902 A JP2004306902 A JP 2004306902A
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Prior art keywords
light
frequency
modulated
wave
light emitting
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JP2003106326A
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JP4233371B2 (en
Inventor
Shigenori Sato
重徳 佐藤
Yoshiaki Okazawa
芳昭 岡沢
Masahiro Hirayama
正博 平山
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ERUTERU KK
KYOSAN KAKO KK
Kyosan Electric Manufacturing Co Ltd
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ERUTERU KK
KYOSAN KAKO KK
Kyosan Electric Manufacturing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the influence of a low frequency optical noise to prevent the mutual interference with an adjacent crossing and additionally to make a detector small to reduce the restriction in installation. <P>SOLUTION: The crossing obstruction detector includes: light emitters 1a to 1e modulating carrier waves, driving light emitting elements, and emitting modulated waves with an intermittent period; and light receivers 2a to 2e receiving lights from the light emitters 1a to 1e, converting it to voltages, and taking out modulated wave components, converting them to direct currents, and outputting them. The detector raises the frequencies of the carrier waves and the modulated waves of the light emitters 1a to 1e, and prevents erroneous detection due to the low frequency optical noise such as HID lamps to surely detect the crossing obstruction such as vehicles. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
この発明は、軌道の踏切における自動車や歩行者等を検知する踏切障害物検知装置、特に高輝度放電灯(以下、HID(High Intensity Discharge)ランプという)などの影響を除去して誤検知を防止し、安全性の向上を図るとともに、小形化により設置上の制約の低減に関するものである。
【0002】
【従来の技術】
【特許文献1】特開平5−8731号公報
【特許文献2】特開平10−76954号公報
鉄道保安装置の踏切警報装置は、軌道上を走行する列車が踏切に接近したときに踏切警報を開始し、踏切道の通行を遮断して列車の安全運転と踏切道を通行する自動車や歩行者の安全を図り、列車が踏切を通過した後は速やかに通行遮断を解除して円滑な道路通行ができるようにしている。
【0003】
この踏切道における列車の安全運行を阻害する自動車などの障害物を検出する踏切障害物検知装置として、特許文献1や特許文献2に示すように、踏切道と軌道を挟んだ両側に複数の発光器と受光器を組み合わせて配置し、踏切上に赤外線等の光ビームの光線網を配光し、列車が接近したときに光ビームが一定時間継続して遮光した場合、踏切道に自動車等の障害物がありと判断して列車に危険を報知している。
【0004】
この光ビームを利用した踏切障害物検知装置の発光器6は、図5のブロック図に示すように、発振器61と分周器62と変調器63と増幅器64及び発光ダイオード(LED)65を有する。発振器61は、数kHz例えば5kHzで励振して搬送波fcを出力する。この搬送波fcを分周器62で分周して数100Hz例えば250Hzの変調波fmを作成して変調器63に送る。変調器63は搬送波fcを変調波fmで図6の波形図に示すように変調して増幅器64に送る。増幅器64は送られた被変調波を増幅して発光素子(LED)65を駆動し、断続周期の変調光を発光させる。
【0005】
このLED65から出射する変調光を受光する受光器7は、図7のブロック図に示すように、受光部71と増幅器72とBPF73と検波器74とBPF75と増幅器76と変圧器77及び整流回路78を有する。受光部71は発光器6からの変調光をフォトダイオードPDで受光して電圧に変換し、増幅器72により増幅し、搬送波fcのBPF73で帯域外成分を除去し、検波器74で搬送波fcを整流し、BPF75で変調波fmの成分を取り出し、増幅器76で変調波fmの成分を増幅し、変圧器77で入力電源と出力部を分離し電源が出力に混入することを防止し、変圧器77から出力した信号を整流回路78で直流に変換して検知リレーを動作させる。そして発光器6と受光器7の間で光が遮断されたとき、受光器7の出力がなくなり、障害物ありとしている。
【0006】
【発明が解決しようとする課題】
近年、自動車のヘッドライトや電車の前照灯などに省エネルギと高寿命化のため高輝度放電灯(以下、HID(High Intensity Discharge)ランプの使用が急速に増加している。このHIDランプの光スペクトラムは、光ビームを利用した踏切障害物検知装置の発光器6で使用している近赤外領域まで広がっており、放電周波数は数100Hzであるので、その高調波の影響により受光器7が誤動作を起こすことがある。
【0007】
また、受光部71のフォトダイオードPDが太陽光などの直流光により飽和し、信号が抑圧されているのを防ぐために、一般的には、受光部71にインダクタンスLを挿入しているが、搬送波fcの周波数が低いため大きなインダクタンスが必要である。また、変調波fmの周波数も低いので、変調波fmの成分を取り出すBPF75なども大きくなり、装置の小形化を困難にしている。
【0008】
さらに、隣接踏切の干渉対策として複数の変調波を持つことは必要周波数帯域の点からも実現が難しいという問題もある。
【0009】
この発明はこのような問題を解消し、HIDランプなどの低周波の光雑音の影響を除去し、隣接踏切との相互干渉を防止するとともに、装置を小形化して設置上の制約を低減することができる踏切障害物検知装置を提供することを目的とするものである。
【0010】
【課題を解決するための手段】
この発明の踏切障害物検知装置は、搬送波を変調して発光素子を駆動して断続周期の変調光を発光させる発光器と、発光器からの光を受光して電圧に変換し、変調波成分を取り出して直流に変換して出力する受光器とを有する踏切障害物検知装置において、搬送波と変調波の周波数を高くしてHIDランプなどの低周波の光雑音の影響を除去したことを特徴とする。
【0011】
前記搬送波の周波数を10MHz帯にすることが望ましい。
【0012】
また、前記搬送波を分周し周波数が異なる複数の変調波を作成し、設置場所に応じて異なる周波数の変調波を選択し、選択した変調波のパルス幅を周波数に応じて補正して、光エネルギを均一にするとともに隣接する踏切間の干渉を防ぐ。
【0013】
【発明の実施の形態】
図1は踏切障害物検知装置の配置図である。図に示すように、踏切障害物検知装置は複数の発光器1a〜1eと複数の受光器2a〜2eを有する。発光器1a〜1eと受光器2a〜2eは踏切3の踏切道と軌道4を挟んだ両側に組み合わせて配置され、踏切上に近赤外線等の光ビームを配光し、列車5が接近したとき、受光器2a〜2eで受光している光ビームが一定時間継続して遮光した場合、踏切道に自動車等の障害物がありと判断して列車5に危険を報知する。
【0014】
発光器1は、図2のブロック図に示すように、発振器11と分周器12とスイッチ13とパルス幅制御回路14と変調器15と増幅器16及びLED17を有する。発振器11は、周波数が10MHzの搬送波fcを出力する。この搬送波fcを分周器12で分周して、周波数が6kHzの変調波fm1と、周波数が10kHzの変調波fm2及び周波数が14kHZの変調波fm3を作成する。これは踏切3で例えば変調波fm1を使用した場合、隣接する踏切では、スイッチ13を切り替えて変調波fm2と変調波fm3を使用することにより、隣接する踏切間で干渉しないようにするためである。
【0015】
このように分周器12から異なる周波数の複数の変調波fm1〜fm3を出力する場合、各変調波fm1〜fm3の平均値が大きく変わってしまい、受光器2で受光する光エネルギが変化してしまう。例えば図4の波形図に示すように、周波数が6kHzの変調波fm1と周波数が10kHzの変調波fm2についてそれぞれ平均値V1,V2を求めると、
変調波fm1の平均値V1=Vp×(tp/t1)
変調波fm2の平均値V2=Vp×(tp/t2)
となり、変調波fm1の周期t1=(1/fm1)と変調波fm2の周期t2=(1/fm2)とにより平均値V1,V2が変る。そこで分周器12から出力する変調波fm1〜fm3のパルス幅をパルス幅制御回路14で補正する。例えば、周波数が10kHzの変調波fm2のパルス幅を5μsとし、周波数が6kHzの変調波fm1のパルス幅を[5×(10/6)]μs、周波数が14kHZの変調波fm3のパルス幅を[5×(10/14)]μsと補正する。
【0016】
このパルス幅を補正した変調波fmにより10MHzの搬送波fcを振幅変調し、増幅器16で増幅してLED17を駆動して発光させる。
【0017】
このLED17からの光を受光する受光器2は、図3のブロック図に示すように、受光部21と増幅器22とBPF23と検波器24とBPF25とスイッチ26と増幅器27と変圧器28及び整流回路29を有する。受光部21は光/電圧変換素子例えばフォトダイオードPDを有し、発光器6からの光をフォトダイオードPDで受光し電圧に変換する。この電圧を増幅器22により増幅し、搬送周波数が10MHzの搬送波fcのBPF23で帯域外成分を除去し、検波器24で搬送波fcを整流し、BPF25で変調波fm1〜fm3の成分を取り出し、設置場所に応じて設定されたスイッチ26により例えば変調波fm1を取り出し増幅器27で増幅し、変圧器28から整流回路29を介して直流に変換して検知リレーを動作させる。
【0018】
この踏切障害物検知装置として影響を受ける光の雑音としてはインバータ蛍光灯やHIDランプからの光があるが、インバータ蛍光灯のインバータ周波数は100kHz程度までであり、輝度の点から直接の影響はなく、HIDランプの放電周波数は500Hz程度であるが、輝度が高く、その高調波の広がりも大きく、また、その光のスペクトラムが近赤外域まで及んでいるため、従来の例えば5kHzと低い搬送周波数の場合は、その影響を受けるが、搬送周波数として10MHz帯を使用することにより、この影響は無視できるとともにBPF23により完全に除去することができる。したがって受光器2がHIDランプなどの低周波の光雑音により誤検知することを防止でき、自動車等の踏切障害物を確実に検知することができる。
【0019】
また、受光部21から出力する変換電圧はフォトダイオードPDの負荷抵抗RLの両端で得ているが、フォトダイオードPDに太陽光が入った場合、太陽光は直流成分であるため、フォトダイオードPDが飽和して10MHzの信号が無くなってしまう。この対策として一般的には負荷抵抗RLと並列にインダクタンスLを接続して直流分を逃がす方法をとっている。このインダクタンスLは直流抵抗が小さく、信号に対しては負荷抵抗RLより十分大きいことが望ましい。例えばRL=1kΩとした場合、インダクタンスLのインピーダンスZLは信号に対しZL≫RLとして、ZL=10kΩとすると、搬送周波数が5kHzと10MHzでZL=10kΩになるインダクタンスLを求めると、
L(10kΩ/5kHz)≒150mH、
L(10kΩ/10MHz)≒150μH
となり、搬送周波数を10MHzにすることによりインダクタンスLの大きさを非常に小さくすることができる。
【0020】
また、搬送周波数を10MHzにすることにより、BPF23としてFM放送用の周波数が10.7MHzのBPFを使用することができるとともに検波器23やBPF24も小形化でき、受光器2を小型化することができ、設置上の制約を低減することができる。
【0021】
【発明の効果】
この発明は以上説明したように、発光素子の駆動周波数として搬送波と変調波の周波数を高くしてHIDランプなどの低周波の光雑音の影響を除去するようにしたから、HIDランプなどの低周波の光雑音により誤検知することを防止でき、自動車等の踏切障害物を確実に検知することができる。
【0022】
また、搬送波の周波数を10MHz帯にすることにより、変調周波数と搬送周波数との比が大きくとることができ、複数の変調周波数を得ることができる。
【0023】
さらに、搬送波を分周し周波数が異なる複数の変調波を作成し、設置場所に応じて異なる周波数の変調波を選択し、選択した変調波のパルス幅を周波数に応じて補正することにより、光エネルギを均一にするとともに隣接する踏切間の干渉を防ぐことができる。
【0024】
また、搬送波の周波数を10MHz帯にすることにより、受光部の受光素子に太陽光が入った場合の影響を除去するするため受光素子の負荷抵抗と並列に接続したインダクタンスの大きさを非常に小さくすることができるとともに、BPFや検波器等の各部品を小型化して受光器を小型化でき、設置上の制約を低減することができる。
【図面の簡単な説明】
【図1】踏切障害物検知装置の配置図である。
【図2】発光器の構成を示すブロック図である。
【図3】受光器の構成を示すブロック図である。
【図4】異なる周波数の変調波による光エネルギの変化を示す波形図である。
【図5】従来の発光器の構成を示すブロック図である。
【図6】発光器で出力する発光波形の波形図である。
【図7】従来の受光器の構成を示すブロック図である。
【符号の説明】
1;発光器、2;受光器、3;踏切、4;軌道、5;列車、11;発振器、
12;分周器、13;スイッチ、14;パルス幅制御回路、15;変調器、
16;増幅器、17;LED、21;受光部、22;増幅器、
23;BPF、24;検波器、25;BPF、26;スイッチ、
27;増幅器、28;変圧器、29;整流回路。
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention removes the influence of a railroad crossing obstacle detecting device for detecting a car, a pedestrian, and the like at a railroad crossing, particularly, a high-intensity discharge lamp (hereinafter, referred to as a HID (High Intensity Discharge) lamp) to prevent erroneous detection. In addition, the present invention relates to improving safety and reducing restrictions on installation by downsizing.
[0002]
[Prior art]
[Patent Document 1] Japanese Unexamined Patent Publication No. Hei 5-8731 [Patent Document 2] Japanese Unexamined Patent Publication No. Hei 10-76954 A railroad crossing warning device of a railway safety device starts a crossing warning when a train running on a track approaches a railroad crossing. In order to ensure the safe operation of the train and the safety of cars and pedestrians passing through the crossing, the traffic will be released immediately after the train crosses the crossing and smooth road traffic will be released. I can do it.
[0003]
As a railroad crossing obstacle detection device that detects an obstacle such as a car that hinders the safe operation of a train on this railroad crossing, as shown in Patent Literature 1 and Patent Literature 2, a plurality of lights are emitted on both sides of a railroad crossing and a track. When a train approaches and a light beam is continuously blocked for a certain period of time when a train approaches, a car, etc. It judges that there is an obstacle and notifies the train of danger.
[0004]
As shown in the block diagram of FIG. 5, the light emitting device 6 of the railroad crossing obstacle detecting device using the light beam includes an oscillator 61, a frequency divider 62, a modulator 63, an amplifier 64, and a light emitting diode (LED) 65. . The oscillator 61 excites at several kHz, for example, 5 kHz and outputs a carrier wave fc. The carrier wave fc is frequency-divided by the frequency divider 62 to generate a modulated wave fm of several hundreds Hz, for example, 250 Hz, and sends it to the modulator 63. The modulator 63 modulates the carrier wave fc with the modulation wave fm as shown in the waveform diagram of FIG. The amplifier 64 amplifies the transmitted modulated wave, drives the light emitting element (LED) 65, and emits intermittently modulated light.
[0005]
As shown in the block diagram of FIG. 7, the light receiver 7 for receiving the modulated light emitted from the LED 65 includes a light receiving unit 71, an amplifier 72, a BPF 73, a detector 74, a BPF 75, an amplifier 76, a transformer 77, and a rectifier circuit 78. Having. The light receiving unit 71 receives the modulated light from the light emitter 6 with the photodiode PD, converts the modulated light into a voltage, amplifies the voltage with the amplifier 72, removes out-of-band components with the BPF 73 of the carrier fc, and rectifies the carrier fc with the detector 74. Then, the component of the modulated wave fm is taken out by the BPF 75, the component of the modulated wave fm is amplified by the amplifier 76, the input power supply and the output section are separated by the transformer 77, and the power supply is prevented from being mixed into the output. Rectifier circuit 78 converts the signal output from the DC to DC to operate the detection relay. Then, when the light is cut off between the light emitting device 6 and the light receiving device 7, the output of the light receiving device 7 disappears, and it is determined that there is an obstacle.
[0006]
[Problems to be solved by the invention]
In recent years, the use of high-intensity discharge lamps (hereinafter, HID (High Intensity Discharge) lamps for headlights of automobiles, headlights of trains, and the like has been rapidly increasing in order to save energy and extend the life. The light spectrum extends to the near-infrared region used in the light emitting device 6 of the level crossing obstacle detection device using a light beam, and the discharge frequency is several hundred Hz. May malfunction.
[0007]
In general, an inductance L is inserted into the light receiving unit 71 to prevent the photodiode PD of the light receiving unit 71 from being saturated by DC light such as sunlight and suppressing a signal. Since the frequency of fc is low, a large inductance is required. Further, since the frequency of the modulated wave fm is low, the BPF 75 for extracting the component of the modulated wave fm also becomes large, which makes it difficult to miniaturize the apparatus.
[0008]
Further, there is a problem that it is difficult to have a plurality of modulated waves as a countermeasure for interference at an adjacent railroad crossing in view of a necessary frequency band.
[0009]
The present invention solves such a problem, eliminates the effects of low-frequency optical noise such as HID lamps, prevents mutual interference with adjacent railroad crossings, and reduces the size of the device to reduce installation restrictions. It is an object of the present invention to provide a railroad crossing obstacle detecting device capable of performing the above-mentioned.
[0010]
[Means for Solving the Problems]
A level crossing obstacle detection device according to the present invention includes a light emitting device that modulates a carrier wave to drive a light emitting element to emit modulated light having an intermittent period, and receives light from the light emitting device and converts the light into a voltage to generate a modulated wave component In a level crossing obstacle detection device having a photodetector that takes out, converts it to direct current, and outputs it, the frequency of the carrier wave and the modulation wave is increased to remove the effects of low-frequency optical noise such as HID lamps. I do.
[0011]
It is desirable that the frequency of the carrier be in a 10 MHz band.
[0012]
Further, the carrier wave is divided to generate a plurality of modulated waves having different frequencies, a modulated wave having a different frequency is selected according to an installation location, and the pulse width of the selected modulated wave is corrected according to the frequency, and the The energy is made uniform and interference between adjacent railroad crossings is prevented.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a layout diagram of a railroad crossing obstacle detection device. As shown in the figure, the railroad crossing obstacle detection device has a plurality of light emitters 1a to 1e and a plurality of light receivers 2a to 2e. The light emitters 1a to 1e and the light receivers 2a to 2e are arranged in combination on both sides of the railroad crossing path of the railroad crossing 3 and the track 4, and distribute a light beam such as near-infrared light on the railroad crossing when the train 5 approaches. When the light beams received by the light receivers 2a to 2e are continuously shielded for a certain period of time, it is determined that there is an obstacle such as an automobile on the railroad crossing, and the danger is notified to the train 5.
[0014]
As shown in the block diagram of FIG. 2, the light emitter 1 includes an oscillator 11, a frequency divider 12, a switch 13, a pulse width control circuit 14, a modulator 15, an amplifier 16, and an LED 17. The oscillator 11 outputs a carrier fc having a frequency of 10 MHz. This carrier fc is frequency-divided by the frequency divider 12 to generate a modulated wave fm1 having a frequency of 6 kHz, a modulated wave fm2 having a frequency of 10 kHz, and a modulated wave fm3 having a frequency of 14 kHz. This is because, for example, when the modulated wave fm1 is used at the railroad crossing 3, the adjacent railroad crossings are switched so that the switch 13 is used to use the modulated wave fm2 and the modulated wave fm3 so that there is no interference between the adjacent railroad crossings. .
[0015]
When a plurality of modulated waves fm1 to fm3 having different frequencies are output from the frequency divider 12 as described above, the average value of each of the modulated waves fm1 to fm3 changes greatly, and the light energy received by the light receiver 2 changes. I will. For example, as shown in the waveform diagram of FIG. 4, when the average values V1 and V2 of the modulated wave fm1 having a frequency of 6 kHz and the modulated wave fm2 having a frequency of 10 kHz are obtained,
Average value of modulated wave fm1 V1 = Vp × (tp / t1)
Average value of modulated wave fm2 V2 = Vp × (tp / t2)
The average values V1 and V2 change depending on the cycle t1 of the modulated wave fm1 = (1 / fm1) and the cycle t2 = (1 / fm2) of the modulated wave fm2. Therefore, the pulse widths of the modulated waves fm1 to fm3 output from the frequency divider 12 are corrected by the pulse width control circuit 14. For example, the pulse width of the modulated wave fm2 having the frequency of 10 kHz is 5 μs, the pulse width of the modulated wave fm1 having the frequency of 6 kHz is [5 × (10/6)] μs, and the pulse width of the modulated wave fm3 having the frequency of 14 kHz is [ 5 × (10/14)] μs.
[0016]
The carrier wave fc of 10 MHz is amplitude-modulated by the modulated wave fm having the corrected pulse width, amplified by the amplifier 16, and drives the LED 17 to emit light.
[0017]
As shown in the block diagram of FIG. 3, the light receiver 2 for receiving the light from the LED 17 includes a light receiving unit 21, an amplifier 22, a BPF 23, a detector 24, a BPF 25, a switch 26, an amplifier 27, a transformer 28, and a rectifier circuit. 29. The light receiving unit 21 has a light / voltage conversion element, for example, a photodiode PD, and receives light from the light emitter 6 with the photodiode PD and converts the light into a voltage. This voltage is amplified by the amplifier 22, the out-of-band component is removed by the BPF 23 of the carrier fc having a carrier frequency of 10 MHz, the carrier fc is rectified by the detector 24, and the components of the modulated waves fm1 to fm3 are taken out by the BPF 25. For example, the modulation wave fm1 is taken out by the switch 26 set according to the above, amplified by the amplifier 27, converted into DC through the rectifier circuit 29 from the transformer 28, and the detection relay is operated.
[0018]
The noise of the light affected by this railroad crossing obstacle detection device includes light from an inverter fluorescent lamp and an HID lamp, but the inverter frequency of the inverter fluorescent lamp is up to about 100 kHz, and there is no direct effect in terms of luminance. , The discharge frequency of the HID lamp is about 500 Hz, but since the brightness is high, the spread of its harmonics is large, and the spectrum of the light extends to the near infrared region, the conventional carrier frequency of 5 kHz, for example, is low. In this case, the influence is affected, but by using the 10 MHz band as the carrier frequency, this influence can be ignored and completely removed by the BPF 23. Therefore, it is possible to prevent the light receiver 2 from erroneously detecting due to low-frequency optical noise such as an HID lamp, and to reliably detect a level crossing obstacle such as an automobile.
[0019]
The converted voltage output from the light receiving unit 21 is obtained at both ends of the load resistance RL of the photodiode PD. However, when sunlight enters the photodiode PD, sunlight is a DC component. The signal is saturated and the signal of 10 MHz disappears. As a countermeasure against this, a method of connecting an inductance L in parallel with the load resistance RL to release a DC component is generally adopted. It is desirable that the inductance L has a small DC resistance and is sufficiently larger than the load resistance RL for signals. For example, when RL = 1 kΩ, the impedance ZL of the inductance L is ZL≫RL with respect to the signal, and ZL = 10 kΩ. When the carrier frequency is 5 kHz and 10 MHz, the inductance L at which ZL = 10 kΩ is obtained.
L (10kΩ / 5kHz) ≒ 150mH,
L (10kΩ / 10MHz) ≒ 150μH
By setting the carrier frequency to 10 MHz, the magnitude of the inductance L can be made very small.
[0020]
Further, by setting the carrier frequency to 10 MHz, a BPF having an FM broadcast frequency of 10.7 MHz can be used as the BPF 23, and the detector 23 and the BPF 24 can be downsized. It is possible to reduce installation restrictions.
[0021]
【The invention's effect】
As described above, the present invention increases the frequency of the carrier wave and the modulation wave as the driving frequency of the light emitting element to eliminate the influence of low frequency optical noise such as HID lamps. It is possible to prevent erroneous detection due to the optical noise of the vehicle and to surely detect a level crossing obstacle such as an automobile.
[0022]
In addition, by setting the frequency of the carrier wave to the 10 MHz band, the ratio between the modulation frequency and the carrier frequency can be increased, and a plurality of modulation frequencies can be obtained.
[0023]
Furthermore, by dividing the carrier wave to create a plurality of modulated waves having different frequencies, selecting a modulated wave having a different frequency according to the installation location, and correcting the pulse width of the selected modulated wave according to the frequency, the Energy can be made uniform and interference between adjacent railroad crossings can be prevented.
[0024]
In addition, by setting the frequency of the carrier wave to the 10 MHz band, the magnitude of the inductance connected in parallel with the load resistance of the light receiving element is very small in order to eliminate the effect of sunlight entering the light receiving element of the light receiving section. In addition, the size of each component such as the BPF and the detector can be reduced to reduce the size of the light receiver, and the restrictions on installation can be reduced.
[Brief description of the drawings]
FIG. 1 is a layout diagram of a railroad crossing obstacle detection device.
FIG. 2 is a block diagram illustrating a configuration of a light emitting device.
FIG. 3 is a block diagram illustrating a configuration of a light receiver.
FIG. 4 is a waveform chart showing changes in light energy due to modulated waves having different frequencies.
FIG. 5 is a block diagram showing a configuration of a conventional light emitting device.
FIG. 6 is a waveform diagram of a light emission waveform output from a light emitting device.
FIG. 7 is a block diagram illustrating a configuration of a conventional light receiver.
[Explanation of symbols]
1; light emitter, 2; light receiver, 3; railroad crossing, 4; track, 5; train, 11;
12; frequency divider, 13; switch, 14; pulse width control circuit, 15; modulator,
16; amplifier, 17; LED, 21; light receiving unit, 22;
23; BPF, 24; detector, 25; BPF, 26; switch,
27; amplifier, 28; transformer, 29; rectifier circuit.

Claims (3)

搬送波を変調して発光素子を駆動して断続周期の変調光を発光させる発光器と、発光器からの光を受光して電圧に変換し、変調波成分を取り出して直流に変換して出力する受光器とを有する踏切障害物検知装置において、搬送波と変調波の周波数を高くしてHIDランプなどの低周波の光雑音の影響を除去したことを特徴とする踏切障害物検知装置。A light emitting device that modulates a carrier wave to drive a light emitting element to emit modulated light of an intermittent cycle, receives light from the light emitting device, converts the light into a voltage, extracts a modulated wave component, converts the component into a direct current, and outputs it. What is claimed is: 1. A railroad crossing obstacle detecting device having a photodetector, wherein the frequency of a carrier wave and a modulation wave is increased to remove the influence of low frequency optical noise such as an HID lamp. 前記搬送波の周波数を10MHz帯にした請求項1記載の踏切障害物検知装置。The railroad crossing obstacle detection device according to claim 1, wherein the frequency of the carrier wave is in a 10 MHz band. 前記搬送波を分周し周波数が異なる複数の変調波を作成し、設置場所に応じて異なる周波数の変調波を選択し、選択した変調波のパルス幅を周波数に応じて補正する請求項1又は2記載の踏切障害物検知装置。3. The carrier wave is divided to generate a plurality of modulated waves having different frequencies, a modulated wave having a different frequency is selected according to an installation location, and a pulse width of the selected modulated wave is corrected according to the frequency. The crossing obstacle detection device according to the above.
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