時間エタロンと自動制御方式による電気クロノメーター

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Meeting the frequent requirement of the necessity for realization of the modern technique of an automatic recording device for the purpose of measuring short time intervals, without the aid of a troublesome and costly oscillograph, a simple electric chronometer has been constructed making use of an aperiodic phenomenon. The principle and the outline of this meter can easily be seen from Fig. 2, where R_1, R_2, …… and C constitute a series of "chronometric etalons" -the concept of this word is defined by the formula (8)-in which RC=3.476×10^n sec and n are simple whole numbers as 1, 0, -1, -2 and so on. J the output current passing through the bridge AB, is a simple function of the observed time interval. The calibration formula for t is now expressed as [numerical formula] where t_1=10^m sec, and A is a calibration constant of the meter, and the parameter m denotes the constant ratio of two fixed potentials E_1 and E_2. The newly constructed chronometer has the following merits : 1) Superiority of the technique of observation in speed and in low cost to any other recording chronometers. 2) No photographic film, no development and no counting. 3) Excellent behavior in good memory of recording without delay of observation. The reading of J is kept unchanged until we discharge the etalon condenser. 4) No need of skill,-independent of personal equation. 5) No influence upon the observation owing to the unexpected variation of potential E_2. The accuracy of observation inherent to this chronometer is estimated to be ±1% or so. Three examples of application of this instrument will be given. They are: 1) Demonstration experiments of the synchronism of an "electronic synchronous timer" (Step characters : cf. Fig. 10 and 11.). 2) Observation of time of breaking off of fuse wires when overloaded. 3) Rapid and automatic indication of high electric resistances up to 10^<10>Ω. It is also applicable to the measurement of time of completion of any transient phenomena, for instance contact time of collision of metallic bodies and lapse of time between two consecutive signals as in the case of impulse of super sonic and its echo. (Conversion of signals can be carried out by means of a modification of a multivibrator, cf. Fig.13).
宇宙航空研究開発機構の論文
1954-07-30

時間エタロンと自動制御方式による電気クロノメーター

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