Portable handheld soil heavy metal detection device based on laser-induced breakdown spectroscopy

Abstract

The invention discloses a laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device. The laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device comprises an optical probe part and a signal acquisition and control part. The optical probe part is characterized in that a laser emission head in a housing emits laser; and the emitted laser passes through a series of lenses, then is coupled to optical fibers and then is input into a spectrograph of the signal acquisition and control part. An optical signal is transformed into an electrical signal and then is input into a computer. The computer stores and processes the input electrical signal. The laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device adopts an off-axial aspherical mirror so that height calibration and turning of a light beam emitted by plasma are carried out simultaneously without a color difference so that coupling of follow-up light beams to optical fibers is guaranteed. The laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device adopts the lenses to realize laser beam conversion so that output energy of the laser emission head is reduced and thus the damage on a sample in detection is reduced. The laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device has a high system integration level, a small volume, light weight and a low cost, is convenient for carrying and operation, and can be realized easily.

Description

technical field [0001] The invention relates to the field of environmental optical detection, in particular to a portable and hand-held soil heavy metal detection device based on laser-induced breakdown spectroscopy. Background technique [0002] The existing heavy metal detection in soil based on laser-induced breakdown spectroscopy is still based on on-site sampling and laboratory analysis methods. Regardless of the optical system, spectrometer or computer control system, they are large and heavy, and can only be obtained from the field. Soil samples are returned and processed before they can be used for testing. At present, there are few compact and portable soil heavy metal detection systems capable of in-situ detection. Moreover, the range of soil heavy metal plasma is generally between 300nm and 500nm. Even though optical probes for laser-induced breakdown spectroscopy have appeared, the design of these probes does not aim at the characteristic spectral bands of s...

AI Technical Summary

Problems solved by technology

At present, there are few compact and lightweight soil heavy metal detection systems capable of in-situ detection

Moreover, the range of soil heavy metal plasma is generally between 300nm and 500nm. Even though optical probes for laser-induced breakdown spectroscopy have appeared, the design of these probes does not aim at the characteristic spectral bands of soil heavy metals to improve the plasma signal. Acceptance efficiency, so these probes are also not suitable for heavy metal detection in field soil

Images