SU645095A1

SU645095A1 - Device for determining anemometric dynamic characteristics

Info

Publication number: SU645095A1
Application number: SU721817595A
Authority: SU
Inventors: Галина Павловна Болдырева; Алексей Семенович Морозов; Виктор Владимирович Тоскин; Александр Яковлевич Ривлин
Original assignee: Предприятие П/Я А-1742
Priority date: 1972-08-08
Filing date: 1972-08-08
Publication date: 1979-01-30

Description

1one

Изобретение относитс к измерительной технике и может быть использовано дл определени динамических характеристик термоанемометров.The invention relates to a measurement technique and can be used to determine the dynamic characteristics of thermoanemometers.

Известны устройства дл измерени динамических свойств термоанемометров, содержащие измерительный преобразователь 1.Devices are known for measuring the dynamic properties of thermoanemometers, comprising a measuring transducer 1.

К недостаткам такого устройства относ тс низкий диапазон измер емых частот и его сложность.The disadvantages of this device include the low frequency range and its complexity.

Наиболее близким по технической сущности к предложенному вл етс устройство, содержащее источник испытательных сигналов , измерительный преобразователь и блок индикации 2.The closest in technical essence to the proposed is a device comprising a source of test signals, a measuring transducer and a display unit 2.

Однако это устройство имеет ограниченный частотный диапазон.However, this device has a limited frequency range.

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

Поставленна цель достигаетс тем, что в устройстве дл определени динамических характеристик термоанемомётров, содержащем источник испытательных сигналов , измерительный преобразователь и блок индикации, измерительный преобразователь через последовательно соединенные резистор и конденсатор подключен к выходу источника испытательных сигналов, выполненного в виде двух последовательноThe goal is achieved by the fact that in the device for determining the dynamic characteristics of thermoanemometers, containing a source of test signals, a measuring transducer and a display unit, the measuring transducer is connected via a series-connected resistor and capacitor to the output of the source of test signals made in two

включенных генераторов низкой и высокой частоты.included low and high frequency generators.

На чертеже показана функциональна схема устройства.The drawing shows the functional diagram of the device.

Устройство состоит из последовательно включенных генератора I низкой частоты, генератора 2 высокой частоты, конденсатора 3, резистора 4, первичного измерительного преобразовател 5, соединенного с испытуемьш термоанемометром 6, и блока 7 индикации, выполненного в виде анализатора гармоник низких частот. Преобразователь 5 помещен в гидро- или аэродинамическую трубу.The device consists of a series-connected low-frequency generator I, a high-frequency generator 2, a capacitor 3, a resistor 4, a primary measuring transducer 5 connected to the test thermo-anemometer 6, and an indication unit 7 made in the form of a low-frequency harmonic analyzer. Converter 5 is placed in the hydro - or wind tunnel.

Работает устройство следующим образом .The device works as follows.

Claims

The converter 5 through the capacitor 3 and the resistor 4 is supplied from the high-frequency generator 2 by an amplitude-modulated alternating current with a carrier frequency much higher than the carrier frequency of the thermoanemometer b or its operating range if the thermoanemometer is operated with direct current. In this case, the thermal constant of time of converter 5 is significantly longer than the period of high-frequency current and the converter responds only to the effective rather than the instantaneous value of the high-frequency current. The frequency of the envelope is set using low: - ... ..-. . ; I: 1,. Frequency generator 17 Agnal of which is supplied to generator 2. Inverter 5 detects a high, high current, changes its resistance with the envelope frequency corresponding to the frequency of the pulsation component of the flow velocity being studied. Measuring with the help of a harmonic dialyzer the amplitude of the input signal at different frequencies and a constant amplitude of the input signal, the frequency characteristics of the thermoanemometer are obtained. An apparatus for determining the dynamic characteristics of thermometers with meters, containing a test signal source, a measuring transducer and a display unit, characterized in that, in order to measure the measurement accuracy, the measuring transducer is connected through a series-connected resistor and a sub capacitor of the test signal to a source of test signals in the form of two series-connected low and high frequency generators. Sources of information taken into account during the examination 1. Physical measurements in gas dynamics and during combustion. M., ed. In. lit. 1957, ch. Vi.

2.DISA Information No. 4, 1966, p. 17-23.