SU905755A1

SU905755A1 - Humidity meter

Info

Publication number: SU905755A1
Application number: SU762434665A
Authority: SU
Inventors: Виталий Иванович Музалевский; Евгений Матвеевич Семенов; Кира Николаевна Шабанова
Original assignee: Ленинградская Ордена Ленина Лесотехническая Академия Им.С.М.Кирова
Priority date: 1976-12-27
Filing date: 1976-12-27
Publication date: 1982-02-15

Description

II

Изобретение относитс к измеритех льной технике.This invention relates to measuring techniques for flax technology.

Известен влагомер, содержащий последовательно соединенные сверхвысокочастотный генератор, коаксиальный резонатор, первый детектор, первый усилитель и первый индикатор tQ .A moisture meter is known that comprises a microwave generator connected in series, a coaxial resonator, a first detector, a first amplifier, and a first tQ indicator.

Однако известный влагомер имеет низкую точность измерений.However, the known moisture meter has a low measurement accuracy.

Цель изобретени - повышение точности измерени .The purpose of the invention is to improve the measurement accuracy.

Цель достигаетс тем, что в влагомер , содержащий последовательно соединенные сверхвысокочастотный генератор, коаксиальный резонатор, первый детектор, первый усилитель и первый индикатор, введены генератор низкой частоты и последовательно соединенные второй детектор, второй усилитель и второй индикатор, а внутренний проводник коаксиального резонатора выполнен полым и соединен с торцом коаксиального резонатора через изол ционную прокладку, приThe goal is achieved in that a moisture meter containing a series-connected microwave generator, a coaxial resonator, a first detector, a first amplifier and a first indicator, a low-frequency generator and a second detector connected in series, a second amplifier and a second indicator, and the inner conductor of the coaxial resonator are hollow and connected to the end of the coaxial resonator through an insulating gasket, with

этом один выход генератора низкой частоты соединен с внутренней поверхностью внутреннего проводника коаксиального резонатора и входом второго детектора, а другой выход - с внешней поверхностью внешнего проводника коаксиального резонатора.This one output of the low-frequency generator is connected to the inner surface of the inner conductor of the coaxial resonator and the input of the second detector, and the other output to the outer surface of the outer conductor of the coaxial resonator.

На чертеже приведена Функциональна схема влагомера.The drawing shows a functional diagram of the moisture meter.

Claims

The moisture meter contains a series-connected microwave generator 1, a coaxial resonator 2, a first detector 3, an amplifier 4, an indicator 5, as well as a low-frequency generator 6 and a series-connected detector 7, an amplifier 8 and an indicator 9, while the inner conductor 10 of the coaxial resonator 2 is hollow and connected to the end of the coaxial resonator 2 Through the insulating gasket 11, the output of the low-frequency generator 6 is connected to the inner surface of the inner conductor 10 of the coaxial resonator 2 and the input The Ktora: 7, and the other output of the low-frequency generator 6 is connected to the external surface of the Coaxial resistor 2 external conductor 12. The moisture meter works as follows. During the measurement, the material under investigation falls asleep into the cavity formed by the inner surface of the internal conductor 10, after which the indicators 5 and 9 find the value of the moisture content of the material under study using tables, nomograms and a computing device. The insulation strip 1 does not prevent the propagation of VLF oscillations, but for a low frequency signal, it represents a large resistance, isolating the outer and inner conductors 12 and 10 of the coaxial resonator.

2. The microwave signal propagates inside the coaxial resonator 2, and in order to avoid losses of microwave energy, the low-frequency signal is supplied to the outer surface of the outer wire 12 and to the inner surface of the inner conductor 10, the moisture meter makes it possible to measure the humidity of the probe. material at ultrahigh frequencies and HFisKHx frequencies, which, compared with limestone moisture, improves the accuracy of measuring the moisture content of bulk materials. The invention includes a moisture meter containing a series-connected microwave generator, a coaxial resonator, a first detector, a first amplifier and a first indicator, in that, in order to improve measurement accuracy, a low-frequency generator and a second detector are connected in series to it, the amplifier and the second indicator, and the inner conductor of the coaxial resonator is hollow and connected to the end of the coaxial resonator through an insulating gasket, with one output generating The low frequency port is connected to the inner surface of the inner conductor of the coaxial resonator and the input of the second detector, and the other output to the outer surface of the outer conductor of the coaxial resonator. Sources of information taken into account during the examination 1. LA Vrandt Study of dielectrics at microwave frequencies. M. 5 1963, p. 128 (prototype).