Thermal measuring and testing – Transformation point determination – Between gaseous and liquid states
Patent
1998-12-11
2000-06-20
Bennett, G. Bradley
Thermal measuring and testing
Transformation point determination
Between gaseous and liquid states
374 54, G01N 2562
Patent
active
060769602
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method, for defining evaporation and particularly to a method for evaluating the amount of evaporation. The present invention further relates to a device arrangement, in order to realize the inventive method.
Metering evaporation is important in many different fields, such as in connection with various researches in plant physiology or in industrial sectors dealing with evaporation, such as different sectors in process-, chemical engineering- or paper industry.
Description of Related Art
Prior methods have included, for instance, when metering evaporation from the surfaces of leaves of plants, using electronic evaporation metering devices, that require a so-called filter through metering device. Such a filter through metering device is manually attached on the surface on a leaf. The filter through metering device creates an air proof space, that contains a gas, whose moisture is metered with electronic hydrometers per se known in the art, and this metering gives the amount of evaporation.
The weakness of this solution has been, though, that it has been troublesome and time consuming to perform and also that the required equipment has been complicated and expensive. It has not been possible to meter evaporation without touching and/or covering the object. Touching and/or covering disturbs in most cases at least to some extent the natural evaporation of the metered object, which can result in inaccuracies in the obtained metering results, thus making the method unreliable. Attaching the filter through and thence also the metering is troublesome to perform. This is especially the case with fragile plants leaves or other similar objects that cannot support weight or objects with an uneven surface. In some cases it would also be important to obtain an essentially large metering surface, which has not been possible with the prior art techniques.
SUMMARY OF THE INVENTION
The object of the present invention is to abolish the disadvantages of the prior art and to provide an innovative solution for defining the amount of evaporation. The inventive solution provides a method and a device for metering the amount of evaporation, which device is easy to use, quick, reliable and adaptable to several different tasks of defining the amounts of evaporation.
It is a further object of the present invention to provide a method and a device for carrying out that method, which enable defining the amount of evaporation without touching and/or covering the surface of the metered object.
An additional object of the invention is to provide a method and an equipment for carrying out the method, in which the metering situation is essentially stable and the number of variables as low as possible.
An additional object of the invention is a method and a device for metering the amounts of evaporation on essentially large surfaces.
It is an object of the invention to further provide a method and means for carrying out the method, with which the metering result can be presented in the desired unit stating the amount of evaporation.
The invention is based on the realization that the amount of evaporation can be defined by comparing the evaporation temperatures of objects in different states, that is by utilizing the physical dependency between the evaporation temperature and the amount of evaporation, according to which a surface from which liquid evaporates becomes cooler in proportion to the amount of evaporation.
According to a preferred embodiment of the present invention the method includes the step of defining or metering the surface temperature of three pieces or objects situated in the same metering environment. The metered pieces consist of a piece, whose amount of evaporation has to be defined and at least two special comparing pieces, whose physical characteristics essentially correspond to the physical characteristics of the metered piece.
One of the comparing pieces is essentially in a so-called non-evaporating state or dry. This piece will further on be refer
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Bennett G. Bradley
Verbitsky Gail
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