CN102426027B - 激光测距仪内光路控制切换装置 - Google Patents
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Abstract
本发明公开了一种激光测距仪内光路控制切换装置,包含一可发出偏振光线的发生装置,还包含可对所述发生装置发出的偏振光线进行偏转的液晶盒,设置于所述液晶盒出射光布儒斯特角附近的透光介质,设置于所述透光介质的出射光方向的偏振片。激光测距仪内光路控制切换装置改变传统的采用机械传动的控制方式,而是采用电路控制,减少了信号干扰,保证内光路校准的准确性和一致性,从而保证了测量精度。本发明的装置结构简洁,具有更好地精准性和可靠性,为激光测距仪内光路的设计发展提供了一个新方向,为激光测距仪的发展提供了技术支持。
Description
技术领域
本发明涉及激光测距仪,尤其涉及激光测距仪校准内光路的控制及切换。
背景技术
激光测距仪的内光路校准是实现测距功能、保证测量精度及提高测距能力的核心技术之一。现有技术中大多采用机械传动方式对测距仪内光路进行控制及切换,机械传动方式因有机械运动必然会产生震动,影响内光路控制及切换的准确性。为此,针对激光测距仪的内光路控制及切换结构产生了许多优化此功能的结构,以提高内光路校准的准确性和一致性。
发明内容
本发明的目的是解决激光测距仪内光路的控制及切换问题,提供一种方便、精准、可靠地进行内光路控制切换的装置。
为解决上述技术问题,本发明提供一种激光测距仪内光路控制切换装置,包含一可发出偏振光线的发生装置,其特征是,还包含
可对所述发生装置发出的偏振光线进行偏转的液晶盒,
设置于所述液晶盒出射光布儒斯特角附近误差在±10°之间的透光介质,
设置于所述透光介质的出射光方向的偏振片。
所述液晶盒对射入的所述偏振光线的偏转角度为0°或90°,不严格限定偏转角度,容许有角度误差,容许误差在±10°之间。
所述偏转角度由施加于所述液晶盒上的电压进行控制。
所述透光介质将入射光分成两束或两束以上不同方向的线偏振光。
所述透光介质为普通玻璃、偏振分光棱镜、偏振分光器、旋转偏振镜中的至少一种。
所述发生装置为单模激光头。
所述发生装置包含多模激光头和对所述多模激光头发出的多模偏振激光偏转的另一偏振片。
本发明所达到的有益效果:
激光测距仪内光路控制切换装置改变传统的采用机械传动的控制方式,而是采用电路控制,减少了信号干扰,保证内光路校准的准确性和一致性,从而保证了测量精度。本发明的装置结构简洁,具有更好地精准性和可靠性,为激光测距仪内光路的设计发展提供了一个新方向,为激光测距仪的发展提供了技术支持。
附图说明
图1为布儒斯特定律示意图;
图2为本发明结构示意图;
图3为发射光路状态示意图;
图4为校准内光路状态示意图;
图中,
入射光1;反射光2;折射光3;多模激光头LD10、第一偏振片11;液晶盒12;透光介质13;第二偏振片14;光线1a;光线2a;光线3a;光线4a;光线5a;光线6a;光线1b;光线2b;光线3b;光线4b;光线5b;光线6b。
具体实施方式
下面结合附图对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案,而不能以此来限制本发明的保护范围。
本发明利用了布儒斯特定律,布儒斯特定律指入射光1的入射角为一特定值α时,反射光2成为完全线偏振光,折射光3为部分偏振光,而且此时的反射光2和折射光3垂直,则此时的入射角α称为布儒斯特角,如图1所示。
如图2所示,本发明的装置包含依次设置的多模激光头LD10、第一偏振片11、液晶盒12、透光介质13、第二偏振片14,当然,可替换的实施方式中的发生装置也可为单模激光头。
多模激光头LD10发出多模偏振激光;
第一偏振片11、第二偏振片14均为可透过与其偏振方向一致的偏振光,遮蔽偏振方向与其垂直的偏振光;
透光介质13放置在经液晶盒12后形成的偏振光线的布儒斯特角附近,因本发明的技术方案对误差有一定包容性,不必须严格放置在布儒斯特角,在布儒斯特角附近的±10°之间的范围内均可。本实施例中透光介质13采用普通玻璃,在其他实施方式中透光介质13也可采用任何能把激光分成两束或两束以上不同方向偏振光的器件,如偏振分光棱镜(PBS)、偏振分光器或旋转偏振镜等。
通过对液晶盒12上的电压控制,可改变射入液晶盒12的激光光线的偏振方向。
本发明的内光路控制切换过程如下:
发射光路状态如图3所示,多模激光头 LD10发出的多模偏振光线1a射入第一偏振片11;通过调整第一偏振片11的角度,将第一偏振片11绕光轴在空间内转动来改变当前的光功率,当前位置时,光线1a垂直入射,光线的出射功率最大,为所需功率的线偏振光线2a;线偏振光线2a射入液晶盒12,液晶盒12的角度为β,通过控制加在液晶盒12上的电压使其为零,即不施加电压,使得光线2a的偏振方向偏转接近90°,形成偏振光线3a。偏振光线3a经透光介质13,透射形成光线4a;不形成反射光或产生低功率的反射光线5a;如激光头的初始偏振方向如不在透光介质表面形成反射光则液晶盒不改变激光偏振方向;光线4a透过第二偏振片14形成高功率岀射光线6a,偏振片14的偏振方向使光线6a、光线5a具有互斥性,;且低功率的光线5a不影响出射光线6a的实现测量功能。
内光路处于发射光路状态时,可以对光功率进行调节并形成岀射光线6a。
校准内光路状态如图4所示,多模激光头 LD10发出的多模偏振光线1b射入第一偏振片11;通过调整第一偏振片11的角度,将第一偏振片11绕光轴在空间内转动来改变当前的光功率,使光线1b从垂直入射转离该位置,向垂直于第一偏振片的位置转动,使出射光功率减小,得到所需功率的线偏振光线2b;线偏振光线2b射入液晶盒12,液晶盒的角度为β+90°,通过控制加在液晶盒12上一电压,使液晶盒12不改变光线2b偏振方向,即光线2b的偏振方向不偏转或者偏转接近0°,形成偏振光线3b。偏振光线3b经透光介质13,反射形成高功率线偏振光线5b,激光头的初始偏振方向在透光介质表面形成反射光则液晶盒不改变激光偏振方向,否则通过液晶盒改变激光偏振方向使得透光介质表面形成反射光,反射的高功率线偏振光线5b被利用为校准内光路;同时透射形成光线4b。光线4b被第二偏振片14遮蔽或产生低功率出射光线6b;光线6b、光线5b具有互斥性,且低功率的出射光线6b不影响内部校准光路的校准功能。
内光路处于校准状态时,可以遮蔽出射光路,并形成校准内光路。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明技术原理的前提下,还可以做出若干改进和变形,这些改进和变形也应视为本发明的保护范围。
Claims (6)
1.一种激光测距仪内光路控制切换装置,包含一可发出偏振光线的发生装置,其特征是,还包含
可对所述发生装置发出的偏振光线进行偏转的液晶盒,所述液晶盒对射入的所述偏振光线的偏转角度为0°或90°,容许误差在±10°之间
设置于所述液晶盒出射光布儒斯特角附近误差在±10°之间的透光介质,
设置于所述透光介质的出射光方向的偏振片。
2.根据权利要求1所述的激光测距仪内光路控制切换装置,其特征是,所述偏转角度由施加于所述液晶盒上的电压进行控制。
3.根据权利要求1所述的激光测距仪内光路控制切换装置,其特征是,所述透光介质将入射光分成两束或两束以上不同方向的线偏振光。
4.根据权利要求1或3所述的激光测距仪内光路控制切换装置,其特征是,所述透光介质为普通玻璃、偏振分光棱镜、偏振分光器、旋转偏振镜中的至少一种。
5.根据权利要求1所述的激光测距仪内光路控制切换装置,其特征是,所述发生装置为单模激光头。
6.根据权利要求1所述的激光测距仪内光路控制切换装置,其特征是,所述发生装置包含多模激光头和对所述多模激光头发出的多模偏振激光偏转的另一偏振片。
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CN2011102602581A CN102426027B (zh) | 2011-09-05 | 2011-09-05 | 激光测距仪内光路控制切换装置 |
US13/600,407 US20130057845A1 (en) | 2011-09-05 | 2012-08-31 | Control and switch device for inner light path of laser distance meter |
DE202012103346U DE202012103346U1 (de) | 2011-09-05 | 2012-09-03 | Steuer- und Schaltvorrichtung für inneren Strahlengang eines Laser-Entfernungsmessers |
GB1215615.4A GB2495369B (en) | 2011-09-05 | 2012-09-03 | Control and switch device for inner light path of laser distance meter |
FR1258294A FR2979715B3 (fr) | 2011-09-05 | 2012-09-05 | Dispositif de commande de commutation pour un trajet optique interne d'un telemetre laser |
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US (1) | US20130057845A1 (zh) |
CN (1) | CN102426027B (zh) |
DE (1) | DE202012103346U1 (zh) |
FR (1) | FR2979715B3 (zh) |
GB (1) | GB2495369B (zh) |
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CN102426027B (zh) | 2011-09-05 | 2013-10-02 | 南京德朔实业有限公司 | 激光测距仪内光路控制切换装置 |
JP6293285B2 (ja) * | 2014-08-12 | 2018-03-14 | 三菱電機株式会社 | レーザレーダ装置 |
CN105223578B (zh) * | 2014-10-27 | 2019-09-10 | 江苏徕兹测控科技有限公司 | 一种双波长脉冲混频相位式激光测距仪 |
KR101620594B1 (ko) * | 2014-10-30 | 2016-05-24 | 한국생산기술연구원 | 다기능 분광장치 |
CN104698404B (zh) * | 2015-03-02 | 2018-07-17 | 北京大学 | 一种用于全光光泵磁力仪的原子磁传感器 |
JP6640149B2 (ja) * | 2017-05-25 | 2020-02-05 | 京セラ株式会社 | 電磁波検出装置および情報取得システム |
CN111487606A (zh) * | 2020-06-05 | 2020-08-04 | 长春理工大学 | 一种大范围连续可调光程模拟装置 |
CN112556579A (zh) * | 2020-12-25 | 2021-03-26 | 深圳市中图仪器股份有限公司 | 一种六自由度空间坐标位置和姿态测量装置 |
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- 2012-09-03 GB GB1215615.4A patent/GB2495369B/en not_active Expired - Fee Related
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US20130057845A1 (en) | 2013-03-07 |
CN102426027A (zh) | 2012-04-25 |
GB2495369A (en) | 2013-04-10 |
FR2979715A3 (fr) | 2013-03-08 |
GB201215615D0 (en) | 2012-10-17 |
DE202012103346U1 (de) | 2012-11-16 |
FR2979715B3 (fr) | 2013-11-08 |
GB2495369B (en) | 2015-12-16 |
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