sewangdaquan

在線留言收藏本站網站地圖歡迎進入開封青天偉業流量儀表有限公司網站！

15年專注流體測控設備，暢銷全球85個國家精准度高、穩定性好、庫存充足

服務熱線：15890954071

熱門關鍵詞：金屬管浮子流量計電磁流量計超聲波液位計旋進漩渦流量計渦輪流量計

您的位置： 首頁 > 新聞資訊 > 技術支持 > 青天儀表廠家淺談eh雷達液位計

青天儀表廠家淺談eh雷達液位計

作者：青天儀表编辑：青天小编来源：青天儀表廠家发布日期： 2020.03.10

信息摘要：

電磁波的物理特性與可見光相似，傳播速度相當于光速。其頻率爲300MHz-3000GHz。電磁波可以穿透空間蒸汽、粉塵等幹擾源，遇到障礙物易于…

電磁波的物理特性與可見光相似，傳播速度相當于光速。其頻率爲300MHz-3000GHz。電磁波可以穿透空間蒸汽、粉塵等幹擾源，遇到障礙物易于被反射，被測介質導電性越好或介電常數越大，回波信號的反射效果越好。因此雷達液位計利用了電磁波的特殊性能來進行料位檢測。

雷達液位計测量原理和主要技术因素：雷達液位計是利用回波测距原理。发射天线向被测目标发射微波，被测目标的微波被接收天线接收，信号处理器将发射信号与接收信号比较，计算出被测距离，由于微波在传播途径上有衰减和干扰反射，故测量的关键是要能接收到反射回波，并识别出有效回波。

雷達液位計

接收的回波能量大小与天线的发射和接收效率以及天线辐射功率有关，故雷達液位計的天线设计和形状很关键，现有的天线除号角天线(喇叭口)和棒状天线外，还有平面天线和抛物面天线，为用于介电常数较小的物料，将缆绳作为天线或安装导波管，缆绳和导波管一直延伸到库或仓底，由此来传递发送和接收的电磁波，增强了回波的信号。接收的回波能量大小与物料表面的介电特性有关，介电常数ε低，物料会吸收部分微波的能量，回波强度也较低;介电常数ε高，反射率高，得到的回波强度也高。通常要求被测物料的介电常数ε：水泥厂固体ε>2.5，水泥的介电常数ε为3,液体为ε>1.8,固体ε>2.5。

以上是eh雷達液位計廠家分享的“青天儀表廠家淺談eh雷達液位計”。谢谢您的收看。如果您有任何问题，您可以在网上咨询或者给我们留言。我们会全心全意为您解答。

【相關推薦】

查看详情 + 上一條青天儀表渦街流量計生产廠家讲解流量计的性能特点
: 查看详情 + 下一條不同工况对雷達液位計有什么影响

返回列表

本文標簽：青天儀表 eh雷達液位計

青天儀表新聞資訊

公司動態

常見問題

技術支持

咨詢熱線

15890954071

網站導航

聯系方式

电话： 15890954071

郵箱：qingtianweiye2008@163.com

QQ：3102773076

地址：河南省開封市祥符區黃龍工業園王白路1號

加好友 微信聯系

聯系電話

15890954071
資料
下載
微信咨詢
返回頂部

‘Are you going home?’ asked the other. ‘My wife, I know, is calling on Lady Keeling, and she will pick me up there. If she has not been so fortunate as to find Lady Keeling in, she will wait for me in the motor. May we not walk down there together?’ ‘My dear,’ he said, ‘I am so glad you have let me come to you. You are in deep waters, poor girl.’ I saw two. "Yes," he said, dismounting and motioning me to do the same. Kendall took our bridles. Leaving him with the animals we went over the fence, through the cotton, across the road at a point terribly near the lighted and guarded shop, and on down the field of corn, to and over its farthest fence; stooping, gliding, halting, crouching, in the cotton-rows and corn-rows; taking every posture two upright gentlemen would rather not take; while nevertheless I swelled with pride, to be alone at the side--or even at the heels--of one who, for all this apparent skulking and grovelling, and in despite of all the hidden drawings of his passion for a fair woman at this hour somewhere in peril, kept his straight course in lion-hearted pursuit of his duty (as he saw it) to a whole world of loves and lovers, martyrs and fighters, hosts of whom had as good a right to their heart's desire as I to mine or he to his; and I remembered Charlotte Oliver saying, on her knees, "I believe no beauty and no joy can be perfect apart from a love that loves the whole world's joy better than any separate joy of any separate soul." That Plato put forward the ethical theory of the Protagoras in perfect good faith cannot, we think, be doubted; although in other writings he has repudiated hedonism with contemptuous aversion; and it seems equally evident that this was his earliest contribution to positive thought. Of all his theories it is the simplest and most Socratic; for Socrates, in endeavouring to reclaim the foolish or vicious, often spoke as if self-interest was the paramount principle of human nature; although, had his assumption been formulated as an abstract proposition, he too might have shrunk from it with something of the uneasiness attributed to Protagoras. And from internal evidence of another description we have reason to think that the Dialogue in question is a comparatively juvenile production, remembering always that the period of youth was much more189 protracted among the Greeks than among ourselves. One almost seems to recognise the hand of a boy just out of college, who delights in drawing caricatures of his teachers; and who, while he looks down on classical scholarship in comparison with more living and practical topics, is not sorry to show that he can discuss a difficult passage from Simonides better than the professors themselves. Nor is this all. After sharply distinguishing what is from what is not, and refusing to admit any intermediary between them, Aristotle proceeds to discover such an intermediary in the shape of what he calls Accidental Predication.236 An accident is an attribute not necessarily or usually inhering in its subject—in other words, a co-existence not dependent on causation. Aristotle could never distinguish between the two notions of cause and kind, nor yet between interferences with the action of some particular cause and exceptions to the law of causation in general; and so he could not frame an intelligible theory of chance. Some propositions, he tells us, are necessarily true, others are only generally true; and it is the exceptions to the latter which constitute accident; as, for instance, when a cold day happens to come in the middle341 of summer. So also a man is necessarily an animal, but only exceptionally white. Such distinctions are not uninteresting, for they prove with what difficulties the idea of invariable sequence had to contend before even the highest intellects could grasp it. There was a constant liability to confound the order of succession with the order of co-existence, the order of our sensations with the order of objective existence, and the subjection of human actions to any fixed order, with the impossibility of deliberation and choice. The earlier Greek thinkers had proclaimed that all things existed by necessity; but with their purely geometrical or historical point of view, they entirely ignored the more complex questions raised by theories about classification, logical attribution, and moral responsibility. And the modifications introduced by Epicurus, into the old physics, show us how unanswerable Aristotle’s reasonings seemed to some of his ablest successors. only three dances with me. He said he was bashful about dancing Please get well--fast--fast--fast. I want to have you close So it was in Larry’s race, with Dick, Sandy and the caretaker. "I'm goin' to stop him killin' mules," he said to himself. "I rayly hope I won't kill him, but that's a secondary matter. Providence'll settle that. It's my duty to stop him. That's clear. If his time's come Providence'll put the bullet where it'll kill him. If it ain't, it won't. That's all. Providence indicates my duty to me. The responsibility for the rest is with Providence, who doeth all things well." ile look 4 it EvEry dAy til i git it. Awake, oh, for shame, ye electors of Rye! He had flung off his coat, and squared up to Realf, who, seeing no alternative, began to strip. "My lord," said Richard, "we are resolved to meet these bold men, and hear what they have to say. Shall you attend us, my lord of Canterbury?" HoME sewangdaquan ENTER NUMBET 0010blackthunder.com.cn
www.cxrcb.com.cn
www.eberkshire.com.cn
futuredirect.com.cn
goberwyn.org.cn
gvobook.com.cn
juxiedu.cn
www.jxgzzhw.com.cn
www.povips5.com.cn
zhangyanjunh.com.cn