SU915020A1 - Sensing element of ultra-high frecuency pulse power flow meter - Google Patents

Description

The invention relates to radio measurements.

Known sensitive element of the flow meter microwave power pulsed, containing a dielectric substrate, on which is applied a ferromagnetic film with contact pads, installed inside a segment of the waveguide, placed in the field of an external magnetic system [1].

However, the known sensitive element does not provide high accuracy of measurements of high levels of microwave pulse power and does not have sufficient electrical strength for these levels.

The purpose of the invention is to improve the accuracy of measurements while increasing the electrical strength.

This goal is achieved by the fact that in the sensitive element of the microwave flow meter2

pulsed power containing a dielectric substrate on which a ferromagnetic film with contact pads is applied, installed inside a waveguide section,

⁵ placed in the field of external ^ magnet-. system, one of the edges of the dielectric substrate is rounded, a ferromagnetic film is deposited on one of the surfaces of the dielectric ^{10 of the} substrate adjacent to the rounded edge with its overlap, and covered with a dielectric layer on the other, the surface of the dielectric substrate adjacent to the rounded ⁵ the edge is applied a layer of conductive non-magnetic material forming galvanic contact with the wide wall of the waveguide cut-off and covering the rounded off portion

²⁰ layers of dielectric.

The drawing shows the design

sensitive element.

ί 91

The sensitive element of the microwave pulse power meter contains a dielectric substrate 1 on which a ferromagnetic film 2 with contact pads is applied, installed inside a segment 3 of a waveguide placed in the field of an external magnetic system, with one of the edges of the dielectric substrate 1 being wrapped with a radius 2, the ferromagnetic “film 2 is deposited on one of the surfaces of the dielectric, the substrate 1 adjacent to the rounded edge with its overlap, and is covered with a dielectric layer 4, and ruguyu surface of the dielectric substrate 1 adjacent to the rounded edge, a layer 5 of conductive nonmagnetic material forming a galvanic contact with the broad wall of the waveguide segment 3 and overlapping rounded portion of the dielectric layer 4.

The sensitive element of the flow meter microwave pulse power works as follows.

During the propagation of microwave energy by the waveguide 3, the ferromagnetic film 2 is in the plane of the transverse components of the field Kx and 1y. With simultaneous exposure to a constant magnetic field But in the ferromagnetic film 2 as a result. Those manifestations of the Hall effect and magnetoresistance result in an emf, the magnitude of which in general is a function of both the characteristics of the ferromagnetic film 2 and the relative orientation of the fields b, id and the ferromagnetic film 2 in section 3 of the waveguide. When the sensitive element is located along the OX axis when the H field interacts _with the OA axis, the signal arising at the contact pads of the ferromagnetic film 2 is proportional to the power dissipated in the load.

Such an orientation (b .1 Id) creates optimal conditions for the ferromagnetic resistance in the ferromagnetic film 2. Therefore, measurements using a sensitive element are conveniently performed with a ferromagnetic re. zonator by changing the magnitude of the field But to obtain the maximum value of the EMF.

four

The rounded face of the dielectric substrate 1 allows an optimal conjugation of the ferromagnetic film 2 and the layer 5 of a conductive nonmagnetic material through the dielectric layer 4, creating a capacitor, one plate of which is a ferromagnetic film 2, and another layer 5 of the conductive nonmagnetic material ¹ that is connected to the wall of segment 3 waveguide.

The ratio К / С = 0.1-0.01, where C is the height of the sensitive element selected experimentally, based on the minimum required capacitance value, permissible electromagnetic field distortion for the coupling area, the permissible level of the microwave signal power and the frequency of the signal.

The galvanic contact of the layer 5 of a conductive non-magnetic material and the wide wall of the waveguide section 3 allows to reduce the potential difference between the ferromagnetic film

2 and the wall of the waveguide section 3, which makes it possible to increase the electrical strength of the sensitive element by 1.5 "1.7 times. The measurement accuracy increases by reducing the conductivity of the longitudinal currents in the ferromagnetic film 2 associated with the configuration of the sensitive element and its position in the segment

3 waveguides.

Claims (1)

Claim Sensitive element of the flow meter of superhigh-frequency pulse power, containing a dielectric substrate on which a ferromagnetic film with contact pads is applied, installed inside a segment of a waveguide placed in the field of an external magnetic system, characterized in that, in order to improve measurement accuracy while simultaneously increasing the electrical strength, the edges of the dielectric substrate are rounded, a ferromagnetic film is deposited on one of the surfaces of the dielectric substrate, rimykayuschey to a rounded edge overlapped with it, and is covered with a dielectric layer on the other surface of the dielectric substrate adjacent to the rounded edge, a layer of 915020 conductive non-magnetic material, forming galvanic contact with the wide wall of the waveguide section and overlapping the rounded portion of the dielectric layer.