| 摘要 |
892,101. Masers. VARIAN ASSOCIATES, and BLOCK, F. April 29, 1958 [May 2, 1957], No. 33586/61. Divided out of 892,100. Class 40 (9). [Also in Group XXXVI] In a gyromagnetic spectrometer including an oscillator 106 feeding a coil 95 adjacent a sample 91, a coil 93 for detecting gyromagnetic resonance in the sample and an amplifier 104, either the amplifier, the oscillator or both may include a gyromagnetic maser, the magnetic polarizing fields of the spectrometer and the maser or masers being parts of a common field. The oscillator has a fixed frequency and the effective magnetic polarizing field is controlled by a sweep generator and coils 97. The output of the maser 104 is fed to a conventional amplifier 101, a detector 102 and a recorder 103. Masers.-Any of the nuclear gyromagnetic masers described in Specification 892,100 may be used. The maser shown in Fig. 20 is of the kind shown in Fig. 17. The working substance 1 flows downwards as shown in a polarization field having a gradient due to the tapered polepiece or pieces 79. A radio frequency source 12 drives the winding 78 at the Larmor frequency of the working substance. As the working substance passes from coil 78 to coil 3, the magnetic moment is reversed and the material is in a high energy state ready for stimulation by a signal at the Larmor frequency for the field between the parallel portions of the polepieces 79. The coupling between the tuned circuit 3, 4 and the working substance determines whether the maser amplifies or oscillates. A maser which is not described in Specification 892,100, is shown in Fig. 12. The working substance 65 is magnetically dilute gadolinium ethyl sulphate having cerium as an additional impurity. Alternatively, it may be a single crystal of nickel fluosilicate. These materials each have two gyromagnetic ensembles with resonance frequencies in the microwave range. The cavity resonators 66 are resonant at the resonance frequencies of the two ensembles. A source 67 of oscillatory energy at the Larmor frequency of one ensemble is coupled to the cavity resonators 66 via a waveguide 68 and a coupling iris 69. The substance 65 is polarized by a magnetic field Ho as shown. The output is taken from a waveguide 71 and a coupling iris 72. |
