Spectrum reflectivity measurer

A technology of spectral reflectance and measuring device, applied in the measurement of color/spectral characteristics, etc., can solve the problems of inability to directly judge the growth of field crops, labor and time, inconvenience, and high price, so as to achieve rapid storage, guarantee accuracy, and operation. simple effect

Inactive Publication Date: 2008-03-19
CHINA AGRI UNIV
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, portable spectrometers used in the field are not only expensive, but also cannot directly judge the growth of field crops when used. The staff carry nearly 10kg of instruments on their backs to carry out testing on the spot, which is l

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Spectrum reflectivity measurer
  • Spectrum reflectivity measurer
  • Spectrum reflectivity measurer

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0036] Figure 1. The instrument consists of three parts: an optical unit 100 , a control unit 300 and an ultrasonic ranging unit 200 . There are four light transmission channels in the optical unit 100, the upper two channels (channels 3, 4) are used to measure the light intensity of solar radiation, and the lower two channels (channels 1, 2) are used to measure the intensity of the light reflected by the canopy. Intensity, the upper and lower corresponding two channels (channels 1 and 4, channels 2 and 3) have filters 40 of the same wavelength and photosensitive devices 60 made of the same material. In order to avoid the influence of the sun angle on the measurement, the upper two channels use a cosine scatterer as the optical window 20 . Since the two channels below measure the light reflected by crops, optical glass made of K9 material is u...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Center wavelengthaaaaaaaaaa
Login to view more

Abstract

The invention relates to a spectral reflectivity measuring device, which comprises an optical unit, a controlling unit and an ultrasonic ranging unit. Four optical transmitting channels are arranged in the optical unit, two upper channels adopt a cosine scatterer as an optical window, and two lower channels adopt a K9 material optical glass window. The optical window, an optical filter and a plano-convex lens are arranged at one end of the optical unit body, a sealing gasket is arranged on the both sides of the optical filter and the plano-convex lens, and a photosensor is arranged at the focal point of the other end of the plano-convex lens of the optical unit body. The controlling unit comprises a sensor, an amplifier, a digital/analog converter, a single-chip microcomputer, a U disk, a liquid crystal display and a keyboard, etc. The ultrasonic ranging unit consists of an ultrasonic sensing module based on the piezoelectricity principle. The invention achieves that the reflected light of the plant canopy and the radiating light of the sun are measured synchronously, the operational procedure of the measurement is simplified, and the measurement height is kept consistent automatically.

Description

technical field [0001] The invention relates to a sensing technology and a spectral measurement technology, in particular to a spectral measurement technology for the growth status of crops. Background technique [0002] Information such as vegetation growth and nutrition can be reflected in the spectral reflectance. The normalized difference vegetation index NDVI (Normalized Difference Vegetation Index) based on the principle of spectroscopy is widely used as the normalized ratio of the two bands of visible light red band and near infrared band. Used for field crop growth detection. This kind of spectral index reflects the effective radiation absorption of vegetation photosynthesis on the one hand, and reflects the size and health of crop groups on the other hand. It is currently the most widely used vegetation index. [0003] There are several methods for measuring the spectral reflectance of crops. The American ASD (Analytical Spectral Devices) company produces a series...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N21/25
Inventor 李民赞曹卫星崔笛朱艳张喜杰汪懋华刘刚
Owner CHINA AGRI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap