| 释义 |
anti-coˈincidence Physics.
[f. anti-1 4 + coincidence 7.]
Applied attrib. to a device, or to a system employing a device, which rejects or discriminates against measurements of events which occur simultaneously or are separated by a predetermined time, used esp. in experiments with cosmic rays and in nuclear physics. Also, the indication of the occurrence of an ionizing particle in such a device.
1939G. Herzog in Physical Rev. LV. 1266/1 To investigate the nature of cosmic-ray particles a special anti-coincidence amplifying set was used to trip the cloud chamber only by those cosmic-ray particles whose further path lies below a given range. 1940― Ibid. LVII. 67/2 Anticoincidences can be used to suppress the recording of the discharges in a coincidence circuit when one additional G-M counter is fired simultaneously. 1948L. Janossy Cosmic Rays iv. 40 If the background of coincidences, caused by the ionizing rays, could be eliminated, the arrangement would be vastly more sensitive for the detection of any non-ionizing rays. The solution of this problem was achieved by the important technique of anti-coincidences. Ibid., By a suitable electrical arrangement the coincidence counters are made insensitive whenever the anti-coincidence counters register a particle. 1953A. D. & K. H. V. Booth Autom. Digital Calculators vi. 42 The circuitry involves only standard coincidence and anti-coincidence units. |