Method for postharvest preservation of vegetables and fruits by LED illumination

A technology of LED light source and LED drive, which is applied in the field of agriculture and lighting, can solve the problems of loss of texture brittleness, loss of flavor, color change, etc., and achieve the effects of low cost, reduced breathing intensity, and simple structure

Inactive Publication Date: 2013-11-27
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under high temperature and dry conditions, some products lose water within a few hours, even with

Method used

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  • Method for postharvest preservation of vegetables and fruits by LED illumination

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Example Embodiment

[0016] Example 1: Such as figure 1 As shown, the device includes an LED drive controller 1, a radiator 2, an aluminum substrate 3, an LED light source 4, an optical element 5, a shelf 6, a shelf 7 and a storage box 8, an LED drive controller 1, a radiator 2. The aluminum substrate 3, the LED light source 4 and the optical element 5 form a lighting system. The shelf 6 is trapezoidal. Several shelves 7 are installed on the shelf 6 from top to bottom. Each shelf 6 is equipped with lighting. System; LED drive controller 1 and LED light source 4 are electrically connected, and pulse width modulation is used to adjust the size, frequency and duty cycle of the working current of LED light source 4, thereby adjusting the size, frequency and duty cycle of the light output of LED light source 4; The LED light source 4 is welded on the aluminum base plate 3, and the aluminum base plate 3 is mounted on the heat sink 2. An optical element 5 is installed in front of each LED light source 4, a...

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Abstract

The invention belongs to the technical field of agriculture and illumination and in particularly relates to a method for postharvest preservation of vegetables and fruits by LED illumination. A postharvest preservation device comprises a vegetable and fruit storage and transport box, LED drive controllers, aluminum substrates, LED light sources, optical elements, a storage shelf and storage plates. The LED drive controllers, heat radiators, the aluminum substrates, the LED light sources and the optical elements form illumination systems which are mounted on the tops of the storage plate layers of the storage and transport box; the storage shelf is ladder-shaped; the plurality of the storage plates are mounted on the storage shelf from top to bottom. In the illumination systems, the LED drive controllers are electrically connected with the LED light sources, and the work current, the frequency and the duty ratio of each LED light source are adjusted in a pulse-width modulation way so as to adjust the light output quantity, the frequency and the duty ratio of each LED light source; one optical element is mounted in front of each LED light source, and light emitted from the LED light sources is intensively and uniformly irradiated on the storage plates through the optical elements. According to the method, the respiration intensity of the vegetables and fruits is reduced through illumination to achieve the purpose of preservation and prevent pathogenic bacteria.

Description

Technical field [0001] The present invention belongs to the field of agriculture and lighting, and it involves a method of LED light for freshness and freshness. Background technique [0002] The harvested fruits and vegetables will cause a lot of rotten and deterioration due to their own aging and the infection of germs, causing major economic losses.The main edible part of the green leafy vegetables is fresh leaves. It starts to deteriorate and deteriorate, especially vitamins, soluble sugar, and protein in about two days after harvesting at room temperature, especially vitamins, soluble sugar and protein.After the harvest, fruits and vegetables are still a life -saving body in storage. It needs to resist the invasion of adverse environments and pathogenic microorganisms, maintain quality, reduce losses, and extend the storage period.Therefore, in the storage, the normal life process of fresh vegetables must be maintained, and changes in the appearance, color, weight, hardness,...

Claims

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Application Information

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IPC IPC(8): A23B7/00
Inventor 周小丽朱雪菘刘颖刘木清
Owner FUDAN UNIV
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