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Detection method of egg ripeness based on light transmission method
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A detection method, egg technology, which is applied in the field of egg maturity detection based on the light transmission method, can solve problems such as difficult to meet the requirements of the food industry, stay at the qualitative analysis level, and complex egg structure, and achieve high accuracy, good color, The effect of accurate information
Active Publication Date: 2020-03-27
SICHUAN UNIV
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B.J.Kemps and others studied the relationship between egg freshness and its reflection and transmission characteristics to light (B J Kemps, F R Bamelis.Visibletransmission spectroscopy for the assessment of egg freshness[J].Journal of the Science of Food&Agriculture,86(9): 1399–1406, 2006), this study obtained the relationship between the light transmittance of eggs and its freshness index (Hough unit), but it can only divide eggs into two grades of qualified and unqualified, with low accuracy and about 15 % of the probability of wrong screening and missing screening, this is due to the complex internal structure of eggs, and most of the research on the light transmission properties under the light source stays at the qualitative analysis level
[0005] To sum up, the current methods for detecting the ripeness of eggs cannot realize the quantitative analysis of the ripeness of eggs, and it is difficult to meet the requirements of the food industry.
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[0028] This implementation first establishes a theoretical model of egg yolk center temperature. Simplify the egg into a spherical shape with a certain density, the radius of the egg is R, define a is the long axis of the egg, b is the short axis of the egg, the egg yolk is similarly spherical, and the yolk diameter is d. Establish the egg heat conduction model:
[0029]
[0030] In the formula, K is the thermal diffusivity, κ is the thermal conductivity, ρ is the density of the medium, c is the specific heat capacity, and t is the boiling time of the egg.
[0031] Transform the egg thermal conductivity model (1) to the spherical coordinate system, simplify the equation and combine the initial boundary conditions:
[0032]
[0033] Get the temperature expression:
[0034]
[0035] Where T W In order to heat the egg, the surface temperature of the egg shell, T O Is the initial temperature of the egg before heating, R is the radius of the egg, and r is the distance from any point on ...
Embodiment 6
[0064] See Table 1 for the maturity of the six eggs to be tested.
[0065] Table 2 Egg measurement parameters and maturity determination results
[0066]
[0067] Note: (1) Egg yolk core temperature T C actual It is measured by inserting the probe thermometer into the egg yolk.
[0068] (2) The error of the yolk center temperature is determined by the formula
[0069] It can be seen from the data in Table 1 that the difference between the egg yolk center temperature calculated by using the present invention and the actual measured egg yolk center temperature is less than 10%, which can more accurately reflect the center temperature of the egg; and according to the yolk center Compared with the actual temperature of the yolk center, the theoretical temperature is basically consistent with the conclusion of the yolk ripeness, which shows that the theoretical temperature of the yolk center provided by the present invention can basically reflect the actual situation of the yolk tempera...
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Abstract
The invention discloses a method for detecting egg ripeness based on a light transmission method. Firstly, a light transmission picture of an egg is collected, and then the central temperature of the egg is obtained by using the gray scale of the center of the egg in the picture, and finally the ripeness of the egg is determined according to the central temperature of the egg. . The invention uses the temperature of the center of the egg yolk to define the ripeness of the egg, which can more accurately reflect the maturity of the egg. It is a non-invasive, quantitative method for detecting the ripeness of the egg, compared with the traditional time analysis method, light analysis method and other qualitative analysis methods. , the egg maturity information provided is more accurate and reliable, meeting people's needs in terms of taste, color and nutritional value.
Description
Technical field [0001] The invention belongs to the technical field of cooking monitoring, and relates to the detection of the maturity of eggs during the heating process, in particular to a method for detecting the maturity of eggs based on a light transmission method. Background technique [0002] Boiled eggs is a very common way of cooking eggs. The taste, color and nutritional value of eggs with different degrees of maturity are different, and some dishes also require eggs with different degrees of maturity as side dishes. According to demand, the current common methods for detecting egg maturity mainly include rotating method, hand-cranking method, salt water floating method, etc. These methods can only be used to qualitatively judge whether eggs are cooked or not cooked based on experience, and cannot be accurate. Quantitative detection of egg maturity. [0003] In 2008, Jin Zhiqiang and others proposed the method of measuring the ratio of free water and bound water of eggs...
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