JPS62233800A - Atomic beam device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] This is an atomic beam device that attempts to improve the S/N ratio of an output signal by providing a plurality of detectors on the output side of a resonator.

[Industrial application field]

The present invention relates to an atomic beam device.

An example of an atomic beam device is a cesium beam tube (C, B
,T,). For example, as shown in FIG. 7, a voltage controlled crystal oscillator 5, a frequency multiplier and a frequency synthesizer 6,
Modulator 7, reference oscillator 9, frequency multiplier 8, C, B
, T, 1, In the phase modulation method consisting of selection AI'lP 2, phase comparator 3, and integrator 4, control J is applied so that the frequency of the microwave input to the resonator and the transition frequency of cesium atoms are matched. .

The present invention thus specifically relates to an atomic beam device represented by a cesium beam tube.

[Conventional technology]

As shown in Fig. 5, the conventional atomic beam device 1° sends a beam of cesium atoms ejected into vacuum from a cesium reactor 11° to a point A [stone 12°, resonator 16°] in the direction of the tti line. , B magnet 13゛, beam detector 1
7' detects the beam current, and finally converts it into a voltage, amplifies it with an amplifier 18', and takes it out as an output signal S°.

(As is known, a cesium atom has two energy levels, and the direction of the force applied to each differs depending on the direction of the magnetic field.Using this property, the two energy levels extracted from the furnace 11' Among the energy levels F-4 and 3, only F=4 is selected by the A magnet and enters the resonator 16°.At this time, if the frequency of the microwave manually applied to the resonator 16' matches the transition frequency of the cesium atom. The atoms at F=4 transition to F=3.This beam is
3 are selected and detected by the beam detector 17'.

[Problems to be Solved by the Invention] The above-mentioned prior art is provided with only one beam detector.

However, of the beams passing through the B stone 13', those that enter the detector 17' form the pattern shown in FIG.

In the resonance pattern shown in Figure 6, the noise ratio is based on I
s and the thermal noise of the resistance, but conventionally this I
There was a problem that B was large and there were many noise components. This is because conventionally, since there is only one detector, F=4, which should not be selected by the B magnet, is input to the detector 17' due to beam collimation or beam velocity tV. That is, in the past, since F=3 and F=4 could not be completely separated, IB increased and noise was large.

[Means for solving problems]

An object of the present invention is to solve the above problems and improve the S/N of the output signal.
The aim is to improve the ratio.

As shown in FIG. 2 voltage conversion amplifiers 18 and 20 are connected in series, and each output signal 3
1 and S2 are input to the differential amplifier 21.

[Function] As described above, according to the present invention, the output signals Sl and S2 bent in opposite directions are input to the differential amplifier, so that the resonance pattern of P=4 is changed to the resonance pattern of F-3. A pattern with a difference in the resonance pattern is obtained, and the IFI increases accordingly.
AMSEY increases and the S/N ratio of the output signal improves.

〔Example〕

The invention will now be explained by way of example with reference to the accompanying drawings.

FIG. 2 is a block diagram of the first embodiment of the present invention.

Fig. 2 shows an atomic beam device for cesium, including a cesium reactor 1, an XA magnet 13, a resonator 1G, an 8M stone 13, a flop-in detector 17 as a first detector, and a 21st pressure A flop-in high resistance voltage conversion amplifier 18 as a conversion amplifier, a flop-out detector 19 as a second detector, a flop-out high resistance voltage conversion amplifier 20 as a 21f voltage conversion amplifier, and a differential amplifier 2
1.

The cesium furnace 11 is heated to about 100° C. and emits cesium atoms in a beam shape into a high vacuum as shown by the dashed line.

The resonator 6 is a cavity resonator, as partially indicated by a broken line, and has a microwave frequency of 9.192M1rz, which is generated by combining oscillation frequencies from a voltage-controlled crystal oscillator (not shown). is input.

The flop-in detector 17 inputs a cesium beam of F=3, and the flop-out detector 19 inputs a cesium beam of F=4, which is ionized by a hot wire and detected as a beam current.

The flop-in, flop-out amplifier 2718.20 is a current-to-voltage conversion type amplifier.

Difference IJJi1 width H21c, each amplification 118.20+7) signal Sl.

S2 is input and the difference is amplified to obtain an output signal S.

The operation of the apparatus shown in FIG. 2 having the above configuration will be explained below.

First, the beam ejected from the cesium reactor II is the B magnet 1.
2. Only those with energy level F=4 are selected and travel straight.

Then, while passing between the cavities of the resonator 16, 9.192M
When irradiated with Hz microwaves and the frequency of the microwaves matches the transition frequency of cesium atoms, a transition occurs to F=3.

The beam of F=3 is bent by the B magnet 13 and input to the flop-in detector 817, and the remaining beam of F=4 is bent to the opposite side and input to the flop-out detector 19.

The beam current of each detector is converted into a voltage and amplified in each amplifier 18, 20, and the resulting signal s, , s2
By inputting this into the differential amplifier 21, the difference signal S can be obtained.

FIG. 3 is a block diagram of a second embodiment of the present invention, which differs from the first embodiment in that the internal structure of the flop-in/flop-out amplifiers 18 and 20 is of a current-voltage conversion type.

In both the first and second embodiments, the flop-in signal S1 has the leftmost pattern in FIG. If it goes through an amplifier, a difference pattern like the one on the far right will be output, and the RAM5EY will be
becomes larger.

〔Effect of the invention〕

As described above, according to the present invention, the output signals S1 and S2 bent in opposite directions are input to the differential amplifier, so that the difference between the resonance pattern of F=4 and the resonance pattern of F=3 is pattern is obtained, and the IFIA
MSEY increases, and as a result, the S/N improves.

[Brief explanation of drawings]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a block diagram of the first embodiment of the present invention, Fig. 3 is a block diagram of the second embodiment of the present invention, and Fig. 4 is a block diagram of the second embodiment of the present invention.
The figure is an explanatory diagram of the effect of the present invention, FIG. 5 is a configuration diagram of the prior art,
FIG. 6 is an explanatory diagram of the effect of the prior art, and FIG. 7 is an explanatory diagram of the industrial application field. 1... Atomic beam device, 11... Nuclear reactor, 1
2...A magnet, work 3...B magnet, 1
6... Resonator, 17... First detector, 1st... First voltage conversion amplifier, 19... Second
Detector, 20... Second voltage conversion amplifier, 21...
Differential amplifier.

Claims (1)

[Claims] Atoms having two energy levels are emitted from the nuclear reactor (11) in the form of a beam, and the atomic beam is connected to the A magnet (12).
) and B magnet (13) and the resonator (16) placed between them.
), in which a first detector () is provided on the output side of the B magnet (13) to detect the atomic beams at two energy levels as currents, respectively. 17), a second detector (19), and a first voltage conversion amplifier (18) and a second voltage conversion amplifier (20) connected in series to these to convert and amplify each beam current into voltage, and further An atomic beam device characterized in that it is provided with a differential amplifier (21) that inputs and amplifies the difference between the outputs of the two voltage conversion amplifiers (18, 20).