RU119116U1 - HYDRAULIC SENSOR - Google Patents

Abstract

1. A moisture meter including a capacitor, each of the two plates of which is made in the form of a group of insulated wires, characterized in that the capacitor is made in the form of a cable, the insulated wires of which form two groups, which are capacitor plates. ! 2. The moisture meter according to claim 1, characterized in that litz wire is used as the cable.

Description

The utility model relates to measuring technique and is designed to measure the humidity of gaseous media, mainly air.

A known sensor-hygrometer is described in patent No. US 3424977, (z. 04.05.1966, op. 28.01.1969), including a capacitor, each of the two plates of which is made in the form of a group of insulated wires.

The disadvantage of this device is the mechanical unreliability of the connection wires - from vibration there is a strong change in capacity. Another disadvantage is the low initial capacitance, which leads to a decrease in measurement accuracy. In addition, the low adaptability of the device leads to a rise in price.

The task to which the claimed utility model is directed is to increase the accuracy of measuring air humidity, increase the mechanical reliability of the device, as well as increase manufacturability.

To solve the problem in a moisture meter, including a capacitor, each of the two plates of which is made in the form of a group of insulated wires, according to a utility model, the capacitor is made in the form of a cable, the insulated wires of which form two groups, which are plates of the capacitor.

As a cable use littsendrat.

The device is illustrated by drawings.

Figure 1 shows a sensor-hygrometer, made in accordance with a preferred embodiment of the inventive device, General view.

Figure 2 is the same, rear view.

The presented example of a specific implementation of the sensor-hygrometer is designed to measure air humidity and is made with the possibility of application in a weather balloon.

The hygrometer sensor includes a capacitor 1, made in the form of a cable, the wires of which, made in enamel insulation, form two groups, which are the plates of the capacitor. The groups are formed by the same number of wires that are evenly twisted along the entire length of cable 1. For example, littsendrat is used as cable 1, namely, a piece of litzendrat of insignificant size, about 20 cm. Cable 1 is fixed to the frame 2, for which, for example, the dielectric plate of the printed circuit board on which the cable 1 is wound spirally in a single layer winding. Cable 1 through terminals 3, 4 is interconnected with a hardware-software complex, including a microcontroller 5 for processing data from a capacitor. The printed circuit board 2 with the elements placed on it is placed in the housing 6, which provides protection from the adverse effects of the environment. The moisture sensor through wires 7 is powered from an external power source, which is located in the weather balloon. An example of the implementation of the inventive device with a built-in power source is also possible.

The device operates as follows.

The moisture sensor implements a capacitive method of measuring humidity. Two groups of wires of cable 1 comprise the capacitor plates, the capacity of which depends on the humidity of the medium in which the moisture sensor is placed. Moisture penetrates into the inter-turn space of the cable 1. The capacity changes due to the significantly higher dielectric constant of water compared with the insulation material of the cable 1 - enamel. The resulting capacity is measured by the microcontroller 5 using the recorded capacity meter program. (The program also calibrates the initial value, sets the required measurement time constant, sets the desired type of output signal, including through the use of pulse-width modulation). Next, the microcontroller 5 converts the obtained value of the capacitance into a moisture value using the correction factors introduced during the calibration of the sensor-moisture meter. The obtained humidity value is converted into the required type of information with the necessary interface. In an example of a specific implementation, the humidity value is converted to a constant voltage, which will allow installing the inventive sensor-hygrometer on existing weather balloons instead of outdated sensors without changing the equipment accompanying it. DC voltage data via communication lines 8 is fed to the input of the low-frequency meteorological probe and, using standard “meteorological probe – operator’s control” conversion means, are received to visually display indicators to the operator on the ground.

The inventive utility model allows to increase the accuracy of measuring air humidity, to increase the mechanical reliability of the device. The inventive device is highly adaptable, simple and inexpensive to manufacture and operate.

The Litzcendrat cable is manufactured under industrial conditions, which gives greater stability of the parameters. In addition, the thickness of the insulation of the wires in the littsendrat is of little importance, which allows the use of a cable segment of a small size as a moisture meter, and a high initial capacitance is obtained, which in turn allows measuring the change in capacitance due to moisture by physically feasible electro-radioelements.

Claims (2)

1. The moisture meter, including a capacitor, each of the two plates of which is made in the form of a group of insulated wires, characterized in that the capacitor is made in the form of a cable, the insulated wires of which form two groups, which are plates of the capacitor. 2. The sensor-hygrometer according to claim 1, characterized in that a littsendrat is used as a cable.