SU473971A1 - Vibrating sample magnetometer - Google Patents

Description

two selective amplifiers distressed about the frequency of the vibrator, according to the condition:

/././2,

where / 1, / 2 - the frequency settings are selective

amplifiers, vibrator fj-frequency.

This makes it possible, not for races of transmission bandwidth of each selective amplifier to section 1, to eliminate distortions caused by the inertia of the gain path of one selective amplifier.

The drawing shows a block diagram of the magitometer described. In the water-cooled solenoid channel / induction sensors 2, 3 are placed, including sequence and counter for measuring by the zero method. Between the sensors, placed in heat-resistant screens 4, there is an ampoule 5, which is the holder of an untreatable sample. The ampoule is attached to the rod 6, which is connected to the vibrator 7, which, in turn, is powered by a sound generator 8. On the same rod there is a compensation coil 9, the pad is located by one of the induction sensors. Induction sensors connected to a measuring circuit consisting of two selective amplifiers 10, 11, forming a selective amplification path, to the output of which a phase detector 12 is connected. The power supply of the compensation coil 9 is supplied from two stabilizers 13, 14, one output voltage which is controlled by a transistor connected to the phase detector. An ammeter 15 and a two-coordinate self-ionian 16 serve to register the value of the current of comneisation or the voltage drop on the compressing coil. The sample is heated by the burner / 7 located in the body of the solenoid perpendicular to its axis. The temperature measurement is carried out with a thermocouple 18, welded to the sample and connected to a dual-wall samoniss.

In the case of the absence of a signal in induction sensors, the output at the output of the phase detector is also zero, the outputs of the adjustable and unregulated stabilizers are equal, and there is no current in the commutation coil. When the vibrator 7 is turned on, a vibrating sample, which is located in the amnule, induces EED sensors in sensors, proportional to the magnetic moment, which is amplified by the selective amplification path, is rectified by a phase detector and fed to the compensation coil power circuit. The excess of the output voltage of the controlled stabilizer over the output of the unregulated stabilizer at the time of compensation determines the current in the compensation coil and is proportional to the measured magnetic moment. Due to the fact that the vibrating magnetic moment of the compensating coil located in close proximity to one of the sensors, nanometer 2 induces an emf. It is only in this sensor that the condition of the separation is the equality of the emf induced by the vibrating magnetic moment of the sample.

in two induction sensors, p emf, induced by the vibrating magnetic moment of the compensating coil in one sensor 2. When the sample is heated by the burner, its magic moment changes, an imbalance occurs

between the signal induced in the induction sensors, the vibrating magnetic moment of the sample and the signal induced in sensor 2 by the compensation coil 9. The imbalance is amplified, rectified n, controlled by the output voltage of the adjustable stabilizer, is reduced to a pool. The value of the compensation current in the compaction coil recorded on a two-coordinate recorder as a function of the sample temperature is

is the dependence of the magnetic moment of the sample on temperature.

The subject and s obretep

1. Magnetometer with a vibrating sample

containing a vibrator, a compisacion coil, a sample holder, a magnetizing device, an induction sensor, and a measuring circuit consisting of a selective amplifier, a phase detector, a full-coil power supply circuit, characterized in that, for the purpose of automatically measuring the magnetic properties of the material at high temperatures and large heating rates, in the case of the magnetizing device, a plasma torch is installed, and the combiSio1H1a coil is placed above one of the inductive sensors and nodes yuchetsa on balanced line between the regulated and unregulated stabilizers ianr voltage, wherein the adjustable stabilizer input coupled to an output of the phase detector.

2. Magnetometer but n. 1, characterized in that, in order to arrange inertia

device, the selective amplification path contains two settlementally connected selective amplifiers that are disturbed with respect to the frequency of the vibrator. According to the convention, 1le /.,; - frequency of the vibrator, / 1 and / 2 - frequency settings of the selective amplifiers.

3. Magnetometer on n. 1, characterized by -km, that, in order to eliminate overheating of the magnetizing device and the inductive sensors, the device contains a water cooling system, and the induction sensors are placed in heat shields.