{"id":2384,"date":"2025-02-05T04:58:29","date_gmt":"2025-02-05T03:58:29","guid":{"rendered":"https:\/\/www.aoisensors.com\/?p=2384"},"modified":"2025-02-06T04:32:33","modified_gmt":"2025-02-06T03:32:33","slug":"what-are-capacitive-sensors-and-what-are-they-used-for","status":"publish","type":"post","link":"https:\/\/www.aoisensors.com\/de\/what-are-capacitive-sensors-and-what-are-they-used-for\/","title":{"rendered":"Was sind kapazitive Sensoren und wof\u00fcr werden sie verwendet?"},"content":{"rendered":"
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Was sind kapazitive Sensoren und wof\u00fcr werden sie verwendet?<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Professionelle kapazitive Sensoren<\/a> messen eine Vielzahl von industriellen Gr\u00f6\u00dfen, z.B. die Menge von Granulat, den F\u00fcllstand von Fl\u00fcssigkeiten oder die Bef\u00fcllung von Tanks. Eine weitere Aufgabe der kapazitiven Sensoren ist die Erkennung von metallischen und nichtmetallischen Materialien in einem Stapel, wie z.B. Papierelemente oder Fl\u00fcssigkeit in einem leitf\u00e4higen Element. Die Vielseitigkeit ist der gro\u00dfe Vorteil dieser Sensoren.<\/p>

Das Funktionsprinzip der ber\u00fchrungslosen kapazitiven Sensoren ist mit dem eines Kondensators vergleichbar und beruht auf der Messung von Kapazit\u00e4ts\u00e4nderungen. Dieser Parameter spiegelt die Eigenschaften des elektrischen Feldes wider und beschreibt, wie zwei leitende K\u00f6rper auf eine zwischen ihnen angelegte Spannungsdifferenz reagieren. In den folgenden Abschnitten werden wir die Messfunktionen und das Funktionsprinzip der Sensoren n\u00e4her erl\u00e4utern und ihre Komponenten mit denen der induktiven Sensoren vergleichen.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Kapazitiver Sensor - was ist das?<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Industrielle kapazitive Sensoren sind elektronische Ger\u00e4te, die ein Ausgangssignal erzeugen, wenn sie die Anwesenheit eines Objekts in ihrem Magnetfeld erkennen. Das Signal wird von einer elektronischen Schaltung und einem Mikroprozessor verarbeitet, was Aufgaben wie die Materialerkennung und die Unterscheidung zwischen Kunststoff, Metall und Holz erm\u00f6glicht.<\/p>

Diese Sensoren werden oft als kapazitive N\u00e4herungssensoren bezeichnet, weil sie \u00c4nderungen im elektromagnetischen Feld erkennen, die durch die Ann\u00e4herung eines Objekts verursacht werden. Der Hauptunterschied zwischen kapazitiven und induktiven N\u00e4herungssensoren liegt in ihrem Aufbau.<\/p>

Induktive Sensoren basieren auf einer eingebetteten Spule zur Erkennung, w\u00e4hrend kapazitive Sensoren aus einer Abdeckung, die als Kondensator fungiert, und der Oberfl\u00e4che des zu erkennenden Objekts bestehen. Im Gegensatz zu induktiven Sensoren sind kapazitive Sensoren widerstandsf\u00e4higer gegen Ausf\u00e4lle und mechanische Besch\u00e4digungen.<\/p><\/div><\/div><\/div><\/div>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Welche Materialien erkennt ein kapazitiver Sensor?<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Eine Hauptanwendung von kapazitiven Sensoren ist die ber\u00fchrungslose Erkennung von elektrisch leitenden und nicht leitenden Materialien. Diese Sensoren werden in der Regel zur Erkennung von Feststoffen wie Kunststoffen, Metallen und Holz sowie von verschiedenen Fl\u00fcssigkeiten eingesetzt. Ihre F\u00e4higkeit, Fl\u00fcssigkeiten zu erkennen, macht sie ideal f\u00fcr die Messung des F\u00fcllstands und die Erkennung von Fl\u00fcssigkeiten in Flaschen.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Wie funktioniert ein kapazitiver Sensor?<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Wir haben kurz das Funktionsprinzip und die Anwendungen von kapazitiven N\u00e4herungssensoren besprochen. Diese Sensoren funktionieren \u00e4hnlich wie Kondensatoren. An die Elektroden des Sensors wird eine Wechselspannung angelegt, die bewirkt, dass die positiven und negativen Ladungen kontinuierlich ihre Position wechseln. Diese Bewegung erzeugt ein elektrisches Feld, und die \u00c4nderungen in diesem Feld bilden die Grundlage f\u00fcr die Messung des Sensors.<\/p>

Der N\u00e4herungssensor fungiert als eine H\u00fclle eines Kondensators, w\u00e4hrend das zu messende Objekt als die andere H\u00fclle dient. Die Kapazit\u00e4t im Messsystem ist direkt proportional zur Oberfl\u00e4che der beiden Leiter und umgekehrt proportional zum Abstand zwischen ihnen. Dar\u00fcber hinaus hilft die Beziehung zwischen der Kapazit\u00e4t und der Dielektrizit\u00e4tskonstante des Materials dabei, die Beschaffenheit nichtmetallischer Objekte zu erkennen.<\/p>

Ein wichtiger Faktor, der die Messung beeinflusst, ist die Schaltfrequenz, die typischerweise im Bereich von einigen zehn Hertz liegt. Dadurch sind kapazitive Sensoren f\u00fcr die Messung von Systemen mit schnellen dynamischen \u00c4nderungen weniger geeignet. Die Standardempfindlichkeit dieser Sensoren betr\u00e4gt 1 V\/0,1 mm, d. h. f\u00fcr jede \u00c4nderung des Sensor-Objekt-Abstands um 0,1 mm \u00e4ndert sich die Ausgangsspannung um 1 V.<\/p>

Bei der Auswahl eines Sensors ist es wichtig, Faktoren zu ber\u00fccksichtigen, die die Messung negativ beeinflussen k\u00f6nnen. Eines der Schl\u00fcsselelemente, die die Messgenauigkeit beeinflussen, sind elektromagnetische St\u00f6rungen und Verunreinigungen zwischen dem Sensor und dem Objekt. Diese Faktoren k\u00f6nnen die \u00c4nderung der Dielektrizit\u00e4tskonstante beeinflussen. Au\u00dferdem ist es wichtig, die vom Hersteller angegebenen Temperaturgrenzen und die Korrosionsanf\u00e4lligkeit des Sensors zu ber\u00fccksichtigen.<\/p><\/div><\/div><\/div><\/div>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Anwendung von kapazitiven Sensoren in verschiedenen Branchen<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Aufgrund ihrer Vielseitigkeit k\u00f6nnen kapazitive Sensoren in zahlreichen Branchen eingesetzt werden, z. B. in der Lebensmittel-, Automobil- und Logistikbranche, wobei vor allem die Industrie von ihren Vorteilen profitiert.<\/p>

Pr\u00e4zise kapazitive N\u00e4herungssensoren werden insbesondere zur ber\u00fchrungslosen Erkennung von Verpackungsinhalten, zur Kontrolle des F\u00fcllstands von Fl\u00fcssigkeiten in Flaschen und zur \u00dcberwachung der Bedingungen in verschiedenen Prozessen eingesetzt. Dar\u00fcber hinaus spielen sie eine entscheidende Rolle bei der Erkennung der Ausrichtung von Produkten auf F\u00f6rderb\u00e4ndern und gew\u00e4hrleisten so eine effiziente und genaue Handhabung von Materialien.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Unser komplettes Angebot an Sensorl\u00f6sungen finden Sie unter aoisensors.com<\/a><\/strong><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

What are capacitive sensors and what are they used for? Professional capacitive sensors measure a variety of industrial variables, e.g. the quantity of granulate, the fill level of liquids or the filling of tanks. Another task of capacitive sensors is the detection of metallic and non-metallic materials in a stack, such as paper elements or […]<\/p>","protected":false},"author":1,"featured_media":2385,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_elementor_data":"[{\"id\":\"e8ed686\",\"elType\":\"container\",\"settings\":[],\"elements\":[{\"id\":\"9f1c6c4\",\"elType\":\"widget\",\"settings\":{\"space\":{\"unit\":\"px\",\"size\":30,\"sizes\":[]}},\"elements\":[],\"widgetType\":\"spacer\"},{\"id\":\"e7d338c\",\"elType\":\"widget\",\"settings\":{\"title\":\"What are capacitive sensors and what are they used for?\",\"align\":\"center\",\"title_color\":\"#000000\"},\"elements\":[],\"widgetType\":\"heading\"},{\"id\":\"0adac8d\",\"elType\":\"widget\",\"settings\":[],\"elements\":[],\"widgetType\":\"spacer\"}],\"isInner\":false},{\"id\":\"acfd129\",\"elType\":\"container\",\"settings\":{\"flex_direction\":\"row\",\"flex_wrap\":\"wrap\",\"flex_gap\":{\"unit\":\"px\",\"size\":0,\"column\":\"0\",\"row\":\"0\"}},\"elements\":[{\"id\":\"1ff3e87\",\"elType\":\"container\",\"settings\":{\"flex_direction\":\"column\",\"content_width\":\"full\",\"width\":{\"unit\":\"%\",\"size\":57.866},\"_flex_size\":\"none\",\"_element_width\":\"initial\"},\"elements\":[{\"id\":\"be595be\",\"elType\":\"widget\",\"settings\":{\"editor\":\"

Professional capacitive sensors<\\\/a> measure a variety of industrial variables, e.g. the quantity of granulate, the fill level of liquids or the filling of tanks. Another task of capacitive sensors is the detection of metallic and non-metallic materials in a stack, such as paper elements or liquid in a conductive element. The versatility is the great advantage of these sensors.<\\\/p>

The operating principle of non-contact capacitive sensors is akin to that of a capacitor, relying on the measurement of changes in capacitance. This parameter reflects the electric field's characteristics and describes how two conductive bodies respond to a voltage difference applied between them. In the upcoming sections, we will provide a more detailed explanation of the sensors' measuring functions and operating principle, and compare their components with those of inductive sensors.<\\\/p>\",\"text_color\":\"#000000\",\"_element_width\":\"initial\",\"_element_custom_width\":{\"unit\":\"%\",\"size\":105.926},\"_flex_size\":\"none\"},\"elements\":[],\"widgetType\":\"text-editor\"}],\"isInner\":true},{\"id\":\"ef657ab\",\"elType\":\"container\",\"settings\":{\"flex_direction\":\"column\",\"content_width\":\"full\",\"width\":{\"unit\":\"%\",\"size\":38.593},\"_flex_size\":\"none\",\"_element_width\":\"initial\"},\"elements\":[{\"id\":\"12492d5\",\"elType\":\"widget\",\"settings\":{\"image\":{\"url\":\"https:\\\/\\\/www.aoisensors.com\\\/wp-content\\\/uploads\\\/2025\\\/02\\\/WeChat74dfca2a2a3ded9073e69d38b2b31ae1.jpg\",\"id\":2385,\"size\":\"\",\"alt\":\"\",\"source\":\"library\"},\"image_size\":\"full\",\"image_custom_dimension\":{\"width\":\"250\",\"height\":\"250\"},\"_element_width\":\"initial\",\"_element_custom_width\":{\"unit\":\"%\",\"size\":94.279},\"_flex_size\":\"none\"},\"elements\":[],\"widgetType\":\"image\"}],\"isInner\":true},{\"id\":\"e7dd302\",\"elType\":\"container\",\"settings\":{\"flex_direction\":\"column\",\"content_width\":\"full\",\"width\":{\"unit\":\"%\",\"size\":91.953},\"_flex_size\":\"none\",\"_element_width\":\"initial\"},\"elements\":[{\"id\":\"44a9363\",\"elType\":\"widget\",\"settings\":{\"title\":\"Capacitive sensor - what is it?\",\"title_color\":\"#000000\"},\"elements\":[],\"widgetType\":\"heading\"},{\"id\":\"45df616\",\"elType\":\"widget\",\"settings\":{\"editor\":\"

Industrial capacitive sensors are electronic devices that produce an output signal when they detect the presence of an object within their magnetic field. The signal is processed by an electronic circuit and microprocessor, which enables tasks such as material detection and distinguishing between plastic, metal, and wood.<\\\/p>

These sensors are often referred to as capacitive proximity sensors because they detect changes in the electromagnetic field caused by the approach of an object. The primary distinction between capacitive and inductive proximity sensors is in their design.<\\\/p>

Inductive sensors rely on an embedded coil for detection, whereas capacitive sensors consist of a cover that functions as a capacitor and the surface of the object being detected. Unlike inductive sensors, capacitive sensors are more resilient to failure and mechanical damage<\\\/p><\\\/div><\\\/div><\\\/div><\\\/div>\",\"text_color\":\"#000000\"},\"elements\":[],\"widgetType\":\"text-editor\"},{\"id\":\"4e133d3\",\"elType\":\"widget\",\"settings\":{\"title\":\"What materials does a capacitive sensor detect?\",\"title_color\":\"#000000\"},\"elements\":[],\"widgetType\":\"heading\"},{\"id\":\"f88d471\",\"elType\":\"widget\",\"settings\":{\"editor\":\"

A primary application of capacitive sensors is the non-contact detection of both electrically conductive and non-conductive materials. These sensors are typically used to detect solids such as plastics, metals, and wood, as well as various liquids. Their ability to detect liquids makes them ideal for measuring the fill level and detecting the presence of liquid in bottles.<\\\/p>\",\"text_color\":\"#000000\"},\"elements\":[],\"widgetType\":\"text-editor\"},{\"id\":\"dcb3ce5\",\"elType\":\"widget\",\"settings\":{\"title\":\"How does a capacitive sensor work?\",\"title_color\":\"#000000\"},\"elements\":[],\"widgetType\":\"heading\"},{\"id\":\"90e7274\",\"elType\":\"widget\",\"settings\":{\"editor\":\"

We have briefly discussed the functional principle and applications of capacitive proximity sensors. These sensors operate similarly to capacitors. An alternating voltage is applied to the sensor's electrodes, causing the positive and negative charges to shift positions continuously. This movement generates an electric field, and the changes in this field form the basis of the sensor's measurement.<\\\/p>

The proximity sensor acts as one cover of a capacitor, while the object being measured serves as the other cover. The capacitance in the measurement system is directly proportional to the surface area of the two conductors and inversely proportional to the distance between them. Additionally, the relationship between capacitance and the dielectric constant of the material helps identify the nature of non-metallic objects.<\\\/p>

A key factor influencing the measurement is the switching frequency, which is typically in the range of a few tens of Hertz. This makes capacitive sensors less suitable for measuring systems with rapid dynamic changes. The standard sensitivity of these sensors is 1 V\\\/0.1 mm, meaning that for every 0.1 mm change in the sensor-object distance, there is a corresponding 1 V change in the output voltage.<\\\/p>

When selecting a sensor, it is important to consider factors that may negatively affect the measurement. One of the key elements influencing measurement accuracy is electromagnetic interference and contamination between the sensor and the object. These factors can impact the change in the dielectric constant. Additionally, it is crucial to consider the temperature limits specified by the manufacturer and the sensor's susceptibility to corrosion.<\\\/p><\\\/div><\\\/div><\\\/div><\\\/div>\",\"text_color\":\"#000000\"},\"elements\":[],\"widgetType\":\"text-editor\"},{\"id\":\"88c9f01\",\"elType\":\"widget\",\"settings\":{\"title\":\"Application of capacitive sensors in various industries\",\"title_color\":\"#000000\"},\"elements\":[],\"widgetType\":\"heading\"},{\"id\":\"c6baa90\",\"elType\":\"widget\",\"settings\":{\"editor\":\"

The versatility of capacitive sensors allows them to be utilized across numerous industries, including food, automotive, and logistics, with industry being the primary beneficiary of their advantages.<\\\/p>

In particular, precise capacitive proximity sensors are used for non-contact detection of packaging contents, checking the fill levels of liquids in bottles, and monitoring conditions in various processes. Additionally, they play a crucial role in detecting the orientation of products on conveyor belts, ensuring efficient and accurate handling of materials.<\\\/p>\",\"text_color\":\"#000000\",\"_element_width\":\"initial\",\"_element_custom_width\":{\"unit\":\"%\",\"size\":105.519},\"_flex_size\":\"none\"},\"elements\":[],\"widgetType\":\"text-editor\"}],\"isInner\":true}],\"isInner\":false},{\"id\":\"b97c94d\",\"elType\":\"container\",\"settings\":{\"flex_direction\":\"column\"},\"elements\":[{\"id\":\"2503373\",\"elType\":\"widget\",\"settings\":[],\"elements\":[],\"widgetType\":\"spacer\"},{\"id\":\"5f8be58\",\"elType\":\"widget\",\"settings\":{\"editor\":\"

For our complete selection of sensor solutions, visit aoisensors.com<\\\/a><\\\/strong><\\\/p>\",\"align\":\"center\",\"text_color\":\"#333333\",\"_element_width\":\"initial\",\"_element_custom_width\":{\"unit\":\"%\",\"size\":97.891},\"_flex_size\":\"none\"},\"elements\":[],\"widgetType\":\"text-editor\"}],\"isInner\":false}]","footnotes":""},"categories":[16],"tags":[],"class_list":["post-2384","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"\nWhat are capacitive sensors and what are they used for? | aoisensors.com<\/title>\n<meta name=\"description\" content=\"Professional capacitive sensors are used to measure a wide range of industrial variables, such as the amount of granulate, the liquid fill level, or the contents of tanks. These sensors also play a key role in detecting both metallic and non-metallic materials in stacks, including paper elements or liquid inside conductive containers. 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