CN202869961U

CN202869961U - Mobile reference light path device for water quality analysis meter

Info

Publication number: CN202869961U
Application number: CN 201220414396
Authority: CN
Inventors: 李宏; 吴铁军
Original assignee: 杭州希玛诺光电技术有限公司
Priority date: 2012-08-21
Filing date: 2012-08-21
Publication date: 2013-04-10

Abstract

The utility model discloses a mobile reference light path device for a water quality analysis meter, and the device is used for eliminating a measurement error caused by the performance drift of a photoelectric device of the meter. The device comprises a mobile double-groove sample tank 1, a sample tank driving device 2 composed of a driving motor 11, a gear rack 12 and a driving gear 13, a data processing and controlling unit 3, and a sample detection light path composed of a light source 4, an optical fiber 5, a light source incidence window 6, a spectrum detection window 7 and a photosensitive sensor 8. In a process of measuring a sample, the data processing and controlling unit 3 transmits an order, so that the double-groove sample 1 is driven to reciprocally move along a chute 15 on a sample tank base 14 through the sample tank driving device 2, so as to sequentially locate a pure water reference groove 10 and a detected sample groove 9 in the sample tank onto the sample detection light path, and to generate a pure water reference spectrum and a detected sample spectrum which are calculated in the data processing and controlling unit 3, in order to acquire an effective spectrum effect of a special compound in the detected water sample.

Description

A kind of portable reference light paths device for water quality analyzing instrument

Technical field

The utility model relates to a kind of reference light paths device, particularly a kind of light path reference instrument for water quality optical analysis instrument.

Background technology

Described water quality optical analysis instrument is widely used in measuring the concentration of specific compound in the water body (being generally organism), its working mechanism is when utilizing the continuous spectrum light beam irradiates water body of ultraviolet-visible (UV) wave band (200-800nm), the principle that its energy can be absorbed by various organic molecule selectivity wherein, by measuring UV absorption spectrum intensity, fluorescent emission intensity or the Raman diffused light spectral intensity of water sample, obtained again the measured value of organism overall target in the water sample by the calculated with mathematical model of complexity.In the measurement mechanism of this principle of work, except light source, light sensor, outside the physical optics checkout equipments such as water sample sampling device and the embedded computer data processing unit, all chemical reaction processes have been got rid of, therefore no longer need any chemical reaction equipment, thereby a series of defectives of traditional hydrochemistry analysis meter have been overcome from performance, has analysis speed fast (being generally the 100min order of magnitude), without reagent (and the reagent that may bring discharges the secondary environmental pollution that causes), device structure is simple, non-maintaining, it is lower that equipment is installed the environmental requirement of required place, equipment construction investment and cost of equipment maintenance be lower advantage all, thereby is specially adapted to unattended online water analysis on a large scale, environmental pollution monitoring.Chinese invention patent CN101275905A " a kind of multi-source optical spectrum syncretizing portable water quality analysis meter " has provided a representative instance of this type of water quality optical analysis instrument.

In the use procedure of this type of instrument, (the mass color source is with prolonging and the luminous intensity decay service time in accordance with rites for the performance drift of photoelectric device, and light sensor is in the course of the work because the baseline wander that temperature variation produces), be the main interference factors that causes the instrument measurement precise decreasing.Therefore, how to reduce and eliminate because the measuring error that causes of above-mentioned disturbing factor is one of gordian technique that guarantees the measuring accuracy of water quality optical analysis instrument in long-term use procedure.

Chinese invention patent CN101539521A " a kind of constant-temperature fluorescence detector with optical fiber reference light paths " has provided a kind of reference light paths implementation method that adopts optical slot, light beam beam-splitting board and photomultiplier, to eliminate the instantaneous shake of light source and light intensity attenuation to the interference of testing result.But optical slot and light beam beam-splitting board all can significantly weaken the energy density of water sample incident light, cause the measurement result signal to noise ratio (S/N ratio) under weak signal conditions significantly to descend, and improve signal to noise ratio (S/N ratio) such as need and then need adopt powerful light source; And be to amplify feeble signal to adopt photomultiplier, then can not provide the spectral distribution curve of measurement result, photomultiplier can't be eliminated by the method as light sensor baseline wander error in the course of the work in addition.Therefore there is limitation in said method.

Summary of the invention

The purpose of this utility model is for the problem that prior art measure signal intensity when realizing reference light paths weakens too much, signal to noise ratio (S/N ratio) reduces, and a kind of new reference light paths structure is provided.Be characterized in adopting the portable sample cell design of double flute, in the water sample measuring process, obtain successively water sample spectral signal and reference spectral signal, then eliminate the fluctuation of detected water sample incident intensity to the interference of measurement result by calculating.The utility model need not to obtain reference signal by optical slot and light beam beam splitting stool optical device, eliminating owing to do not affect the signal to noise ratio (S/N ratio) of measurement result during measuring error that the performance drift of photoelectric device causes, and can be widely used in the obtaining of continuous spectrum distribution curve of water sample.

In existing water sample in the optical analysis process of organic concentration, for the interference to specific compound spectral effective signal in the water sample of the spectrum of eliminating hydrone itself, usually all need before the instrument operation, to use the pure water water sample to carry out " zero correction ", namely preserve the measure spectrum of this pure water water sample, so that in follow-up water sample spectral measurement process, by calculating the impact of deduction pure water spectrum, obtain the efficient light spectrum signal of specific compound in the water sample.

Above-mentioned working mechanism according to water quality optical analysis instrument, the technical solution of the utility model is: be the double flute portable structure with the sample cell part design of instrument, one of them sample cell is used for depositing removable sample, and another sample behaviour is used for depositing the permanent pure water reference sample of sealing up for safekeeping; Sample cell parts integral body can move reciprocatingly with respect to light source and light sensor by driven by power under the controller instruction, successively sample and pure water reference sample is positioned on the optical measurement passage that is comprised of light source and light sensor.

When water quality optical analysis instrument was carried out sample measurement at every turn, its inner controller at first portable sample cell parts of instruction was positioned pure water reference sample on the optical path, and obtains pure water reference spectrum; Then the portable sample cell parts of instruction are positioned sample for optical path, obtain detected water sample spectrum.Obtain on result's the basis at above-mentioned spectrum at last, by calculating the impact of deduction pure water spectrum, obtain the efficient light spectrum signal of specific compound in the water sample.

Because when instrument was measured, the interval time of obtaining successively pure water reference spectrum and sample spectrum by portable sample cell was very short (usually 10 at every turn ^-1-10 ⁰The s order of magnitude), therefore during this time the performance drift increment of the photoelectric devices such as the light source in the interval and light sensor be considered as zero.Thereby when passing through to calculate, from sample spectrum during the affecting of deduction pure water spectrum, because photoelectric device performance drift the pure water reference spectral measurement error and the sample spectral measurement error that cause are cancelled each other, therefore effectively reduce and eliminated the impact of photoelectric device performance drift on the efficient light spectrum signal of specific compound in the water sample.

The utility model does not change the original photoelectric device type of water quality optical analysis instrument and spectrum generation mechanism when realizing, therefore when eliminating the affecting of photoelectric device performance drift, do not change the signal to noise ratio (S/N ratio) of specific compound efficient light spectrum signal in the detected water sample, do not change by specific compound efficient light spectrum signal type in the detected water sample of original photoelectric device type decided yet, therefore can be used for the photoelectric device performance drift error concealment of various water quality optical analysis instrument.

Description of drawings

Fig. 1 is the portable reference light paths device of water quality analyzing instrument synoptic diagram.

Fig. 2 is reference light paths device A-A cut-open view.

Embodiment

Extremely shown in Figure 2 such as Fig. 1, a kind of portable reference light paths device for water quality analyzing instrument, processed and control module 3 by double flute sample cell 1, sample cell drive unit 2, data, and the sample detection light path that is comprised of light source 4, optical fiber 5, light source incidence window 6, spectral detection window 7 and light sensor 8 is consisted of.Wherein double flute sample cell 1 is comprised of sample groove 9 and pure water reference groove 10, places respectively sample and reference pure water sample; Sample cell drive unit 2 comprises drive motor 11, be connected to the tooth bar 12 of double flute sample cell 1 bottom and be connected to driven wheel 13 in drive motor 11 rotating shafts.Sample detection light path and drive motor 11 are connected with sample cell pedestal 14, and double flute sample cell 1 can move back and forth along the chute 15 on the sample cell pedestal 14 under the driving of sample cell drive unit 2.

When instrument started a sample measurement process, data processing and control module 3 at first sent order-driven sample cell drive unit 2 the pure water reference groove 10 in the double flute sample cell 1 are positioned on the sample detection light path, and generated pure water reference spectrum; And then send order-driven sample cell drive unit 2 the sample groove 9 in the double flute sample cell 1 is positioned on the sample detection light path, and generate sample spectrum.The pure water reference spectral signal that generates successively and sample spectral signal are admitted to the data processing at last and control module 3 calculates, to obtain the efficient light spectrum signal of specific compound in the detected water sample.

Claims

1. portable reference light paths device that is used for water quality analyzing instrument, by double flute sample cell (1), sample cell drive unit (2), data are processed and control module (3), and the sample detection light path consists of, it is characterized in that double flute sample cell (1) has portable structure, wherein sample groove (9) is used for depositing removable sample, pure water reference groove (10) is used for depositing the permanent pure water reference sample of sealing up for safekeeping, double flute sample cell (1) integral body can move reciprocatingly with respect to light source (4) and light sensor (8) by driven by power under data processing and control module (3) instruction, successively sample and pure water reference sample is positioned on the optical measurement passage that is comprised of light source (4) and light sensor (8).

2. the portable reference light paths device for water quality analyzing instrument according to claim 1, when it is characterized in that instrument starts a sample measurement process, data processing and control module (3) send order-driven sample cell drive unit (2) the pure water reference groove (10) in the double flute sample cell (1) and sample groove (9) are positioned on the sample detection light path successively, and corresponding generation pure water reference spectrum and sample spectrum, then send into data processing and control module (3) and calculate, to obtain the efficient light spectrum signal of specific compound in the detected water sample.