Device and method for collecting visible and near-infrared spectra of field fruits

Abstract

The invention discloses a device and a method for collecting visible and near infrared spectrum of fruits in the field. A housing of the device is provide with a shutter and an integrating sphere, and the shutter is connected to a light source and is mounted above an entering hole of the integrating sphere, and the entering hole is located on an output probe, and the periphery of the output probe is mounted with an annular rubber gasket. A through hole below the integrating sphere is installed by a collimating lens, and the light of the collimating lens is transferred to a detector of a spectrum analyzer through an output optical to measure scene spectrum of the fruit in the field under the combined action of the spectrum analyzer light source and the scene ambient light and to measure field background spectrum of the fruit in the field only under the action of the scene ambient light. The scene spectrum and the field background spectrum are corrected to obtain visible and near infrared spectrum information which can really reflect the fruit quality. The device can effectively reduce the influence of field environment light, and is conducive to the application of visible and near infrared spectroscopy technology from the interior to the field, and can give full play to the visible and near infrared spectroscopy technology in the fruits of the field management and harvest maturity test.

Description

technical field [0001] The invention relates to a fruit spectrum acquisition device and method, in particular to a field fruit visible and near-infrared spectrum acquisition device and method in the field of optical measurement technology. Background technique [0002] Visible and near-infrared spectroscopy technology has been widely used in the internal quality inspection of fruits after harvest. The spectral collection of fruits is mostly carried out indoors under constant temperature and humidity conditions. Studies have shown that this technology can be used to detect the maturity of fruits in the field before harvest. However, the application of near-infrared spectroscopy technology in preharvest fruit has not been developed due to the influence of instrument conditions and complex lighting and temperature conditions in the field. At present, in the experiment of collecting near-infrared spectra of fruits in the field, the existing technology has a method of using baggi...

AI Technical Summary

Problems solved by technology

However, due to the influence of instrument conditions and complex lighting, temperature and other environments in the field, the application of near-infrared spectroscopy technology in fruit pre-harvest has not been developed.

At present, in the experiment of collecting near-infrared spectra of fruits in the field, the existing technology has adopted the method of bagging to block the field light, which can obtain ideal results, but the detection efficiency is low, which is not conducive to practical application; the dark field calibration of the instrument and the reference spectrum Calibration and other methods are helpful to reduce the model error. However, these two methods only consider the influence of the environment on the instrument and light source, and cannot effectively eliminate the interference of field ambient light. The measured spectrum cannot truly reflect the internal information of field fruit samples.

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