热释电人体红外线传感器的基本结构和原理--毕业论文外文翻译.doc
《热释电人体红外线传感器的基本结构和原理--毕业论文外文翻译.doc》由会员分享,可在线阅读,更多相关《热释电人体红外线传感器的基本结构和原理--毕业论文外文翻译.doc(12页珍藏版)》请在咨信网上搜索。
1、The principle and application of Pyroelectric infrared sensor By John.ChurPyroelectric infrared sensor body (hereinafter referred to: sensor) from sensitive units, impedance converter and filter window of the three major components.1、Sensitive unit The different sensors, sensitive element of the mat
2、erial is different. If SD02 sensitive units made by the PZT; P2288 from LiTaO3 made. These materials to make thin sheet, each one of the two sides of the relatively thin lead an electrode, the electrodes at both ends of the formation of the equivalent of a small capacitor. Because these two small ca
3、pacitor is done in the same silicon chip.And they form the equivalent of small capacitor can have its own polarization, the polarization of the result, the two ends of a capacitor in the opposite polarity of the positive and negative charge. But the capacitor is the polar opposite of the series. Thi
4、s is the unique design of the sensor, thus making it a unique and anti-jamming.When the sensor detects no radiation from the body of the infrared signal, as P1, P2 have its own polarization, the two ends of a capacitor in the opposite polarity, is the equivalent of electricity, negative charge, whic
5、h the two capacitor is the opposite polarity The series, therefore, positive and negative charge to offset each other, not in the loop current, a sensor output.When the human body sensors detect static in the region, exposure to the P1, P2 on the infrared light energy equivalent, and achieve a balan
6、ced, polar opposite, the energy equivalent of light in the loop current offset each other. Sensors are still no signal output. Similarly, in the light or the sun, because the speed of the sun moving very slowly, P1, P2 on the infrared light energy can still be seen as equal and offsetting each other
7、 in the loop.Coupled with the low frequency response of the sensor (normally 0.110 Hz), that is, infrared sensors on the wavelength of light-sensitive a very narrow range (typically 515 um), therefore, the sensor is not sensitive to them.When the temperature change caused the temperature sensor itse
8、lf changes, due to P1, P2 do the same silicon chip, it has the opposite polarity, and the energy equivalent of light in the still current in the loop offset each other, no sensor output.From the principles of perspective, any body will have an infra-red fever, pyroelectric infrared sensors on the bo
9、dy of the sensitivity of the main infrared sensors sensitive performance of the unit by the changes in temperature, and temperature changes lead to the formation of electrical signals. Environment and the temperature change from its own internal structure of its decision not outward output signal.Th
10、e low-frequency response of the sensor (normally 0.110 Hz) and the specific wavelength infrared (normally 515 um) of the sensor response to a decision only on the outside of the infrared radiation caused by changes in temperature sensors and sensitive, and this change In terms of the human body is m
11、oving. Therefore, the sensor on human movement or the movement of sensitive, stationary or moving very slowly in the human body is not sensitive it can be most visible and infrared anti-interference.2、Filter windowIt is a thin glass coating on the multi-layer film from the filter, filter window can
12、effectively filter out 7.014 um outside the infrared wavelengths. For example, SCA02-1,7.514 um wavelength infrared penetration of 70%, 6.5 um Department, dropped to 65 percent, while in 5.0 um, when decrease to 0.1%; P2288 response to the wavelength of 6 14 um, the center wavelength of 10 um.Launch
13、ing objects to infrared radiation, the wavelength of the strongest and the relationship between temperature meetWhich was the largest wavelength, T is absolute temperature. The bodys normal body temperature is from 36 to 37.5, that is, 309310.5 K, its most powerful infrared radiation of wavelength T
14、he center wavelength is 9.65 um.Therefore, the body of the strongest infrared radiation at wavelengths just landed filter window response wavelength (714 um) at the centre. Therefore, the filter can effectively window to the human body through infrared radiation, and the maximum to stop the sun, lig
15、hting and so visible in the infrared through, so as to avoid interference.To sum up, only to mobile sensors or movement of the human body and the body temperature of objects similar to the human body works.Fresnel lens when not in use Fresnel lens sensor detection radius of less than 2 meters, with
16、only the use of Fresnel lens can be most useful. With Fresnel lens when sensors detect a radius of up to 10 meters. For example, some sensors in the 20 meters far from the fast moving car in the human body can be reliably detected. Fresnel lens produced by a plastic plate.The lens measured in the ho
17、rizontal direction into three parts, each part in a vertical direction and divided into a number of different regions. The top part of each Den fen as a lens unit, they constitute from one concentric circles, concentric circles in the center of the lens unit. Middle and the lower portion of each Den
18、 fen for a lens unit, respectively, from the same form concentric circles, but the center of concentric circles is not within the lens unit.When the light through the lens of these units, will be a dark-and visible areas and blind spots. Since each element of a lens only a small angle, for the fores
19、eeable perspective, the perspective for the blind spot. Any two adjacent lens units are in a blind spot between that area and spacing of their intermittent without duplication and overlapping. In this way, when the lens on the front of the sensor is an appropriate location, movement in the event of
20、a human body in front of the lens.Infra-red radiation to the human body through the lens in the sensor on the formation of the turn of the changes in the shadow of (blind spots) and bright (that), so that the surface temperature sensors constantly changing, so the output signal. This can also unders
21、tand that human activities in the region detection, leaving a field of view lens unit, will immediately enter another field of view lens unit.Because neighboring close intervals between the lens unit), with a sensor on the body of the blind spot of mobile and visible, leading to changes in temperatu
22、re sensor, and output signals. Fresnel lens that can not only create zones and blind spots, focusing, its focus is generally about five centimeters, the actual application, should be based on the actual situation or information provided to adjust Fresnel lens and the distance between sensors , The g
23、eneral sensor in the lens fixed in front of 1 to 5 cm in places.The general Fresnel lens made of polyethylene plastic film, for the color of milky white or black, with a translucent, but the wavelength of the infrared around 10 um, it is transparent.The pyroelectric infrared sensors basic human appl
24、ication PY1 sensor for the P2288 or SCA02-1, IC1 for low-noise amplifier LM358, such as high-speed computing. PY1 detected by the infrared signal the human body, from 2 feet out of the extremely weak signals with the direct input of the amplifier IC1a release about 2,500 times, from 1 foot a certain
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 热释电 人体 红外线 传感器 基本 结构 原理 毕业论文 外文 翻译
1、咨信平台为文档C2C交易模式,即用户上传的文档直接被用户下载,收益归上传人(含作者)所有;本站仅是提供信息存储空间和展示预览,仅对用户上传内容的表现方式做保护处理,对上载内容不做任何修改或编辑。所展示的作品文档包括内容和图片全部来源于网络用户和作者上传投稿,我们不确定上传用户享有完全著作权,根据《信息网络传播权保护条例》,如果侵犯了您的版权、权益或隐私,请联系我们,核实后会尽快下架及时删除,并可随时和客服了解处理情况,尊重保护知识产权我们共同努力。
2、文档的总页数、文档格式和文档大小以系统显示为准(内容中显示的页数不一定正确),网站客服只以系统显示的页数、文件格式、文档大小作为仲裁依据,平台无法对文档的真实性、完整性、权威性、准确性、专业性及其观点立场做任何保证或承诺,下载前须认真查看,确认无误后再购买,务必慎重购买;若有违法违纪将进行移交司法处理,若涉侵权平台将进行基本处罚并下架。
3、本站所有内容均由用户上传,付费前请自行鉴别,如您付费,意味着您已接受本站规则且自行承担风险,本站不进行额外附加服务,虚拟产品一经售出概不退款(未进行购买下载可退充值款),文档一经付费(服务费)、不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
4、如你看到网页展示的文档有www.zixin.com.cn水印,是因预览和防盗链等技术需要对页面进行转换压缩成图而已,我们并不对上传的文档进行任何编辑或修改,文档下载后都不会有水印标识(原文档上传前个别存留的除外),下载后原文更清晰;试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓;PPT和DOC文档可被视为“模板”,允许上传人保留章节、目录结构的情况下删减部份的内容;PDF文档不管是原文档转换或图片扫描而得,本站不作要求视为允许,下载前自行私信或留言给上传者【胜****】。
5、本文档所展示的图片、画像、字体、音乐的版权可能需版权方额外授权,请谨慎使用;网站提供的党政主题相关内容(国旗、国徽、党徽--等)目的在于配合国家政策宣传,仅限个人学习分享使用,禁止用于任何广告和商用目的。
6、文档遇到问题,请及时私信或留言给本站上传会员【胜****】,需本站解决可联系【 微信客服】、【 QQ客服】,若有其他问题请点击或扫码反馈【 服务填表】;文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“【 版权申诉】”(推荐),意见反馈和侵权处理邮箱:1219186828@qq.com;也可以拔打客服电话:4008-655-100;投诉/维权电话:4009-655-100。