Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1982-02-03
1984-01-31
Griffin, Donald A.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
G01D 942
Patent
active
044293194
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the registration or recording of a measured quantity, which is time-dependent, and which is present in the form of an electrical signal, the registration being of the kind including conversion or transformation of the signal to an emission or radiation flow, with detection and integrating registration of thus generated emission by means of an element sensitive to said emission, said element thus being given a subsequently readable, integrated measurement value registration correpsonding to a time function of the quantity to be measured. The obtained measurement value registration can especially represent an exposure dose.
BACKGROUND ART
Registration of the kind mentioned above is already known, e.g. from the Swedish patent No. 7413396-8. This publication describes a so-called audio or noise dosimeter, which includes a microphone transmitting an electrical signal in response to sound picked up by it, said signal being supplied to two parallel light-emitting diode (L.E.D.) circuits after filtering and amplification. Each circuit has a LED, which is energised for emitting light when the input signal to the circuit is within a given interval corresponding to a given sound level interval. Each LED has allotted to it a given portion of a photographic film, where the emission flow of the associated LED is detected and integratingly recorded as a film darkening. After a recording process, which may include an arbitrary time period, either continuous or comprising partial periods, the film will accordingly carry a number of integrated measurement value registrations (dose records) corresponding to the number of measurement intervals, i.e. to the number of LEDs, each registration representing the noise dose for the associated measurement interval. The respective noise doses may be subsequently established by determining the degree of darkening (after developing the film) on the respective portions of the film by comparison with known degrees of darkening, e.g. in a so-called densiometer.
A recording apparatus that is constructed in accordance with the known principles described above affords a number of advantages, such as: Permitting registration of measured quantity sequences having very short duration, e.g. sound impulses; Operation entirely without moving parts; Easily miniaturizable utilizing modern transducer and other circuit and electronics components, making it particularly well suited to applications for personal wear.
This known kind of registering apparatus has a clear disadvantage however, since the actual determination of an obtained measurement value is complicated, and requires densiometric equipment or other similar, advanced laboratory equipment.
OBJECT OF THE INVENITON
The object of the present invention is thus to provide a new, improved method of registration, of the kind mentioned in the introduction, by means of which said disadvantage is overcome, in that a direct reading of the obtained measurement value is enabled, other advantages also being gained such as excellent possibilties of adaptation to different registration requirements, and the possibility of accurate multi-interval registration, even in cases where greatly differing activities of quantities to be measured can be expected in the various measurement intervals.
SUMMARY OF THE INVENTION
The above-mentioned object is achieved in accordance with the invention by a method and apparatus being given the features set forth in the appended claims.
The invention thus means that the element detecting and integratingly recording the generated emission or radiation for every desired measurement value relatable to the measured quantity as such, or a given interval for the measured quantity value, is provided with a registration, the readable extension of which constitutes a directly determinable measure of the desired measurement value. In other words, the extent of the readable registration on the element increases according as the received integrated emission flow increases. The ext
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patent: 3545564 (1970-12-01), Barber
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Lofman Carl O.
Lofman Olof B. G.
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