Current carbon film straight line Displacement sensor Only the output signal is approximately linear proportional to the corresponding position. The patent of the utility model breaks the tradition of the industry, provides the output position corresponding signal required by customers according to the specific needs of the industry, and provides customized services for different customers, which is the first in the world. For example: if it is necessary to monitor the oil storage volume of automobile oil tank, the original way is to monitor the liquid level, and the relationship between the liquid level and the volume of oil storage is not a linear proportional relationship at all. Therefore, we can only roughly measure the stock of oil products, or use the complex calculation of complex instruments to get rough data. This is not easy to popularize; second, the instrument is easy to fail and make mistakes; third, the accuracy is too poor; fourth, it is not intuitive and complicated to operate. If the output of the sensor can be directly output according to the ratio of liquid level to volume, the above problem can be solved. This patent is to solve the traditional carbon film straight line Displacement sensor The problem of output position correspondence is solved.
2、 Basic principles
Carbon film linear displacement sensor is to use the carbon film to uniformly distribute resistance in the linear direction, use the voltage at both ends, and the brush slides on the linear carbon film to output voltage, so as to obtain the corresponding position. If the voltage signal is converted by V / A, the current signal can also be obtained. On the basis of the original carbon film linear displacement sensor, this patent can easily engrave the resistance distribution corresponding to the position volume corresponding output by using the linear resistance engraving machine. Therefore, as long as the original traditional linear displacement carbon film plate is modified according to the above corresponding relationship, a new output linear displacement sensor is obtained.
Moreover, this relationship exists not only in the relationship between the oil tank and the liquid level, but also in the relationship between the position and force, as well as the relationship between the position of the free falling body and the velocity.
3、 Principle of original structure of carbon film
4、 Schematic diagram of carbon film engraving
5、 Electrical schematic diagram
As shown in the figure: a fixed DC voltage is added to both ends of the carbon film resistance board, and the output voltage value is contacted by the sliding brush. If we know the total length of the carbon film plate in advance, we can get the relative position through the output voltage value, that is, the absolute displacement.
If the output voltage signal is processed, the current signal can be obtained for long-distance transmission.
Taking the relationship between velocity and height of free falling body as an example, v = (2 * g * h) 1 / 2, we can get the relationship between velocity and falling position of free falling body. The carbon film can be modified according to this curve. Of course, the specific application is far from the only one. There are also such as: the relationship between liquid level and liquid volume, the relationship between compression displacement and pressure, etc.