CN209117578U - A kind of two-way measurement of comparison spectrometer based on reference optical signal - Google Patents
A kind of two-way measurement of comparison spectrometer based on reference optical signal Download PDFInfo
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- CN209117578U CN209117578U CN201821732032.0U CN201821732032U CN209117578U CN 209117578 U CN209117578 U CN 209117578U CN 201821732032 U CN201821732032 U CN 201821732032U CN 209117578 U CN209117578 U CN 209117578U
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Abstract
The utility model relates to a kind of two-way measurement of comparison spectrometer based on reference optical signal, it is connected by two-way sampler through two-way detection acquisition module, control and treatment circuit, light source module is connect through monochromator with two-way sampler, power supply connects two-way detection acquisition module, control and treatment circuit, light source module and monochromator, control and treatment circuit connect monochromator and upper structure at.Monochromatic light will be scanned with two-way sampler to be divided into and the measurement light and reference light after sample or reference effect, two ways of optical signals measured value is obtained by two-way detection acquisition module simultaneously respectively, using the ratio between the two as spectral scan measurement data, sample reflectivity or transmitance and absorbance spectrum data are calculated with the spectral scan measurement data of spectral instrument reference, background, sample.Compared with the spectrometer of monochromatic light road, influence of the light source stability to stability of instrument is effectively eliminated, compared with existing double light path spectrometer, structure is simple, at low cost, the stability especially suitable for portable instrument.
Description
Technical field
The utility model relates to a kind of portable spectrometers to eliminate the System and method for that light source stability influences, especially base
In the portable near infrared spectrometer and spectral measurement method of the signal two-way detection comparison correction measurement of reference light.
Background technique
Spectral instrument has wide range of applications as a kind of common analysis instrument.Spectral instrument is by light source, monochromator, spy
Survey several parts compositions such as device, sampler, acquisition and control, power supply.The complex light that light source issues is divided into space point by monochromator
Enter detector after the monochromatic light of cloth, sampled device and sample or reference effect, is converted to electric signal, is acquired after enhanced processing
Sample or reference effect after digital signal, the two compared to sample relative reflectance or optical transmission spectra data.
The stability of spectrometer is its important technical indicator, and the photostability of light source directly affects the stability of instrument.
The stability of light source be guaranteed by the stability of the electric signals such as light source power supply circuital current, voltage, but the optical signal of light source with
Electric signal is non-linear relation, therefore the stabilization for controlling electric signal not can guarantee the stabilization of optical signal.
In order to avoid the unstable influence to spectral instrument of optical signal, double-optical path method a: drive test is generallyd use
The actuating signal of sample is measured, measures the actuating signal of reference all the way, two paths of signals is compared after acquiring simultaneously can obtain sample
Reflection or transmission spectroscopic data.But such instrument needs to increase multiple light splitting reflectors, two sets of samplers or even two sets
Acquisition Circuit, and require two optical paths to keep symmetrical, therefore structure is complicated, increases the cost of instrument, is not suitable for especially
Portable instrument.
Summary of the invention
The purpose of this utility model is aiming at above-mentioned problem of the prior art, for the stability for improving portable instrument,
A kind of two-way measurement of comparison spectrometer based on reference optical signal is provided.
The thought of the utility model is to change local structure in the structure of single channel spectrometer, increases beam-splitting structure, is carried out
Part light splitting, draws reference light on sampler, original single channel detection and acquisition module is changed to two-way, with the survey after sampling
Amount light samples simultaneously, using the ratio between two ways of optical signals sampled value as scan measures.It is to be suitable for portable spectrometer to eliminate light
A kind of practical technique scheme that source stability influences stability of instrument.
The purpose of this utility model is achieved through the following technical solutions:
A kind of two-way measurement of comparison spectrometer based on reference optical signal, detects acquisition module through two-way by two-way sampler
It is connect with control and treatment circuit, light source module is connect through monochromator with two-way sampler, and power supply is separately connected two-way detection acquisition
Module, control and treatment circuit, light source module and monochromator, monochromator connect with monochromator and host computer respectively through control and treatment circuit
Connect composition.
The described two-way detection acquisition module by prober interface a through photodetector a, signal converter amplifier circuit a and
The connection of double channel A/D C Acquisition Circuit, prober interface b are adopted through photodetector b, signal converter amplifier circuit b and double channel A/D C
Collector connection, two-way data-interface and control signaling interface are separately connected double channel A/D C Acquisition Circuit, and power interface connects respectively
It meets signal converter amplifier circuit a, signal converter amplifier circuit b and double channel A/D C Acquisition Circuit is constituted.
The control and treatment circuit be scan control state interface is separately connected by microprocessor unit, two-way data connect
Mouth, acquisition control signaling interface, communication interface, light source control signal interface and power interface are constituted.
The two-way sampler includes spectrophotometric device and sampling mechanism, incident window, reference light detection window, spectroscope
Spectrophotometric device, measurement optical detection window, sample window and integrating sphere or sample cell and collimation lens composition are formed with light splitting channel
Sampling mechanism is equipped with transflection than the spectroscope for tr, incident window and measurement optical detection window in the light splitting channel of two-way sampler
Mouth is on transmitted light path, and for reference light detection window on reflected light path, two-way sampler includes that reflection sampling and transmission sample
Incident light is divided into transmission measurement light and reflected reference light by two kinds of sample modes, two-way sampler, and two-way light is taken by two-way respectively
The measurement optical detection window and reference light detection window of sample device project, and the detector for being radiated at two-way detection acquisition module respectively connects
On the receiving plane of mouth a and prober interface b,
The condition of the spectroscope transflection ratio tr selection of two-way sampler are as follows:
Wherein, rs1、rs2Respectively measure optical detector and photosurface area and place detecting location optical path with reference to optical detector
The area ratio of emergent light, r1、r2Light and reference light are respectively measured from spectroscope to the stroke of respective detector installation site
The efficiency of transmission of middle light.
The utility model has the advantages that the two-way measurement of comparison System and method for provided by the utility model based on reference optical signal, in list
Increase beam-splitting structure on the spectrometer original optical path of road, carries out local light splitting, draw reference light, and increase the photodetector of reference light
And the measurement light after signal conversion amplification and Acquisition Circuit, with sampling samples simultaneously, with being compared to for two ways of optical signals sampled value
For scan measures.The utility model effectively eliminates light source stability to stability of instrument compared with the spectrometer of monochromatic light road
It influences, compared with existing double light path spectrometer, structure is simple, at low cost, especially suitable for improving the stability of portable instrument.
Detailed description of the invention
A kind of two-way measurement of comparison spectrometer architecture figure based on reference optical signal of Fig. 1
Fig. 2 is light source module structure block diagram in attached drawing 1
Fig. 3 is monochromator structural block diagram in attached drawing 1
Fig. 4 is that two-way detects acquisition module structural block diagram in attached drawing 1
Fig. 5 is control and treatment circuit structural block diagram in attached drawing 1
Fig. 6 is the two-way sampler structure figure that sample mode is reflected in attached drawing 1
Fig. 7 is the two-way sampler structure figure that sample mode is transmitted in attached drawing 1
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples:
A kind of two-way measurement of comparison spectrometer based on reference optical signal, detects acquisition module through two-way by two-way sampler
Connect with control and treatment circuit, light source module is connect through monochromator with two-way sampler, power supply be separately connected two-way detection acquisition
Module, control and treatment circuit, light source module and monochromator, control and treatment circuit pass through scan control state interface and communication respectively
Interface is connected and composed with monochromator and host computer.
The described two-way detection acquisition module by prober interface a through photodetector a, signal converter amplifier circuit a and
The connection of binary channels DAC Acquisition Circuit, prober interface b are adopted through photodetector b, signal converter amplifier circuit b and double channel A/D C
Collector connection, two-way data-interface and control signaling interface are separately connected double channel A/D C Acquisition Circuit, and power interface connects respectively
It meets signal converter amplifier circuit a, signal converter amplifier circuit b and double channel A/D C Acquisition Circuit is constituted.
The control and treatment circuit be scan control state interface is separately connected by microprocessor unit, two-way data connect
Mouth, acquisition control signaling interface, communication interface, light source control signal interface and power interface are constituted.
The two-way sampler includes spectrophotometric device and sampling mechanism, incident window, reference light detection window, spectroscope
Spectrophotometric device, measurement optical detection window, sample window and integrating sphere or sample cell and collimation lens composition are formed with light splitting channel
Sampling mechanism is equipped with transflection than the spectroscope for tr, incident window and measurement optical detection window in the light splitting channel of two-way sampler
Mouth is on transmitted light path, and for reference light detection window on reflected light path, two-way sampler includes that reflection sampling and transmission sample
Incident light is divided into transmission measurement light and reflected reference light by two kinds of sample modes, two-way sampler, and two-way light is taken by two-way respectively
The measurement optical detection window and reference light detection window of sample device project, and the detector for being radiated at two-way detection acquisition module respectively connects
On the receiving plane of mouth a and prober interface b,
The condition of the spectroscope transflection ratio tr selection of two-way sampler are as follows:
Wherein, rs1、rs2It respectively measures optical detector and goes out with reference to optical detector photosurface area with place detecting location optical path
Penetrate the area ratio of light, r1、r2Light and reference light are respectively measured in from spectroscope to the stroke of respective sensor mounting location
The efficiency of transmission of light.
A kind of measurement method of the two-way measurement of comparison spectrometer based on reference optical signal,
With the above-mentioned two-way measurement of comparison spectrometer based on reference optical signal, spectrum letter is sampled at all scanning wavelength λ
Number measurement data d (λ) be measure optical signal digital quantity D (λ) and reference light the ratio between digital quantity D ' (λ)；
When spectrometer is using reflection sample mode measurement sample, obtained reflectance spectrum data R (λ) are as follows:
Wherein d1(λ)、d2(λ)、d3(λ) be respectively spectrometer at scanning wavelength λ to background, reference and sample when
Measurement data；
Wherein D1(λ)、D1' (λ) be respectively spectrometer at scanning wavelength λ, two-way detector circuit is adopted when sampling to background
The digital quantity of the measurement optical signal and reference optical signal of collection；
Wherein D2(λ)、D2' (λ) be respectively spectrometer at scanning wavelength λ, two-way detector circuit is adopted when to reference coupons
The digital quantity of the measurement optical signal and reference optical signal of collection；
Wherein D3(λ)、D3' (λ) be respectively spectrometer at scanning wavelength λ, two-way detector circuit is adopted when to sample
The digital quantity of the measurement optical signal and reference optical signal of collection.
When spectrometer is using transmission sample mode measurement sample, obtained optical transmission spectra data T (λ) are as follows:
Corresponding absorbance A:
A=-logG (7)
Wherein G is that spectrometer measures the optical transmission spectra data R of sample using reflection sample mode or uses transmission sampling
Mode measures the optical transmission spectra data T of sample.
As shown in Figure 1, the spectrometer of the two-way measurement of comparison based on reference optical signal, on single channel spectrometer architecture basis
On, increase by a reference light deriving structure on sampler, original single channel detection and acquisition module are changed to two-way.Its structure packet
Include light source module, monochromator, two-way sampler, two-way detection acquisition module, control and treatment circuit, host computer and power supply composition portion
Point.
Light source module is as shown in Fig. 2, include motor switch, lamp, imaging lens group, modulator, outgoing interface, control signal
Filament of light source is imaged in outgoing interface by interface and power interface, imaging lens group, and modulator is by light modulation at fixed frequency
Alternation optical signal；It outgoing interface, power interface, control signaling interface respectively with monochromator, power supply light source interface, processing
The light source control interface of control circuit connects.
Monochromator is as shown in figure 3, include scanning spectrophotometric device and incident, outgoing, control signal, power interface, scanning point
The complex light of incident interface is divided into the monochromatic light cluster in outgoing interface spatial distribution by photo structure, wherein the light of cluster wavelength
It is projected by outgoing interface, and passes through the wavelength of scan control output light.Its incident interface, outgoing interface, control signaling interface,
Scan control state of the power interface respectively with the outgoing interface of light source, two-way sampler incident window, control and treatment circuit connects
The scan interface connection of mouth, power supply.
Two-way detects acquisition module as shown in figure 4, including two photodetectors and interface, two signal conversion amplification electricity
Road and double channel A/D C Acquisition Circuit and two-way data-interface, control signaling interface, power interface.Its two-way detector connects
Mouth is connect with 2 detector windows of two-way sampler respectively；Two-way data-interface and control signaling interface are controlled respectively at processing
The two-way data-interface of circuit processed is connected with acquisition control signaling interface.
Control and treatment circuit as shown in figure 5, include microprocessor unit, two-way data-interface, acquisition control signaling interface,
Scan control state interface, communication interface, power interface.It passes through two-way data-interface respectively, acquisition control signaling interface, sweeps
State of a control interface, communication interface, power interface is retouched to be connected with two-way detection acquisition module, monochromator, host computer, power supply.
Two-way sampler includes sampling mechanism and spectrophotometric device and incident window, sample window, two detection windows, phase
When in light inlet one suitable spectroscope of transflection ratio tr of placement in single channel sampler.The incident light projected from monochromator is through dividing
The transmission light emission of light microscopic is projected with after sample effect by measurement optical detection window to sampling mechanism, sampled mechanism；Reflected light (in
Between can add reflective mirror) projected from reference optical detector mouth side with reference light.To guarantee that it is photosensitive that reference light reaches reference detector
The light energy in face is suitable with the measurement light arrival light energy of measurement sensor photosurface, and spectroscope transflection ratio tr selects suitable item
Part are as follows:
Wherein, rs1、rs2Respectively measure optical detector and with reference to optical detector photosurface area and place detecting location light
The area ratio of road emergent light；r1、r2Light and reference light are respectively measured in the stroke from spectroscope to sensor mounting location
The efficiency of transmission of light.
It is illustrated in figure 6 the two-way sampler of reflection sample mode, sampling mechanism is integrating sphere；It is illustrated in figure 7 transmission
The two-way sampler of sample mode, sampling mechanism are collimation lens+sample cell.Spectrophotometric device incident window and sampling mechanism it
Between dispose a spectroscope, including incident window, spectroscope, light splitting channel and reference light detection window draw reference light by visiting
Window is surveyed to project.The connection of the outgoing interface of its incident window and monochromator, two detector windows detect with two-way acquire respectively
Two photodetector interfaces of module connect.
The complex light that light source issues is divided into the monochromatic light of spatial distribution by monochromator, and successively obtains one by length scanning
The monochromatic light I (λ) for determining wavelength X range, the incident window of two-way sampler is entered by outgoing interface, obtains two through two-way sampler
Lu Guang: with the measurement light I after sample or reference effect1With the reference light I being divided by I2, respectively enter two-way detector electricity
Two detector circuits on road carry out photoelectric conversion, are converted to two path signal, acquire simultaneously after two-way enhanced processing, respectively
The digital quantity D of measurement optical signal after obtaining sample or reference effecti, reference light digital quantity Di', i=1,2,3.With the two it
Than as current measurement data di, by the reflectivity or optical transmission spectra data G and absorbance that can be calculated sample
A:
A=-logG (7)
Wherein G is that spectrometer measures the optical transmission spectra data R of sample using reflection sample mode or uses transmission sampling
Mode measures the optical transmission spectra data T of sample.
Wherein d1For measurement data of the spectrometer in scanning background:
Wherein D1、D1' it is respectively the spectrometer measurement optical signal that two-way detector circuit acquires in scanning background and reference
The digital quantity of optical signal；For transmiting sample mode, D1=0, d1=0；d2For measurement data of the spectrometer when scanning reference:
Wherein D2、D2' it is respectively the spectrometer measurement optical signal that two-way detector circuit acquires when scanning reference and reference
The digital quantity of optical signal；d3For measurement data of the spectrometer when scanning sample:
Wherein D3、D3' it is respectively the spectrometer measurement optical signal that two-way detector circuit acquires when scanning sample and reference
The digital quantity of optical signal.
Claims (5)
1. a kind of two-way measurement of comparison spectrometer based on reference optical signal, which is characterized in that visited by two-way sampler through two-way
It surveys acquisition module to connect with control and treatment circuit, light source module is connect through monochromator with two-way sampler, and power supply is separately connected double
Road detects acquisition module, control and treatment circuit, light source module and monochromator, control and treatment circuit respectively with monochromator and host computer
It connects and composes.
2. the two-way measurement of comparison spectrometer described in accordance with the claim 1 based on reference optical signal, which is characterized in that described
Two-way detects acquisition module and acquires electricity through photodetector a, signal converter amplifier circuit a and double channel A/D C by prober interface a
Road connection, prober interface b are connected through photodetector b, signal converter amplifier circuit b with double channel A/D C Acquisition Circuit, two-way
Data-interface and control signaling interface are separately connected double channel A/D C Acquisition Circuit, and power interface is separately connected signal conversion amplification
Circuit a, signal converter amplifier circuit b and double channel A/D C Acquisition Circuit are constituted.
3. the two-way measurement of comparison spectrometer described in accordance with the claim 1 based on reference optical signal, which is characterized in that described
Control and treatment circuit is that scan control state interface, two-way data-interface, acquisition control letter are separately connected by microprocessor unit
Number interface, communication interface, light source control signal interface and power interface are constituted.
4. the two-way measurement of comparison spectrometer described in accordance with the claim 1 based on reference optical signal, which is characterized in that described
Two-way sampler includes spectrophotometric device and sampling mechanism, incident window, reference light detection window, spectroscope and light splitting channel composition
Spectrophotometric device, measurement optical detection window, sample window and integrating sphere or sample cell and collimation lens form sampling mechanism, in two-way
The light splitting channel of sampler is equipped with transflection than the spectroscope for tr, and incident window and measurement optical detection window are in transmitted light path
On, for reference light detection window on reflected light path, two-way sampler includes reflection sampling and transmission samples two kinds of sample modes, double
Incident light is divided into transmission measurement light and reflected reference light by road sampler, and two-way light is respectively by the measurement optical detection of two-way sampler
Window and reference light detection window project, and are radiated at the prober interface a and prober interface b of two-way detection acquisition module respectively
Receiving plane on.
5. the two-way measurement of comparison spectrometer based on reference optical signal according to claim 4, which is characterized in that two-way takes
The condition of the spectroscope transflection ratio tr selection of sample device are as follows:
Wherein, rs1、rs2Respectively measure optical detector and photosurface area and place detecting location optical path with reference to optical detector
The area ratio of emergent light, r1、r2Light and reference light are respectively measured from spectroscope to the stroke of respective detector installation site
The efficiency of transmission of middle light.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798548A (en) * | 2020-12-25 | 2021-05-14 | 广东海洋大学 | Portable direct-reading type soluble nitrogen and phosphorus determination device |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798548A (en) * | 2020-12-25 | 2021-05-14 | 广东海洋大学 | Portable direct-reading type soluble nitrogen and phosphorus determination device |
| CN112798548B (en) * | 2020-12-25 | 2023-11-21 | 广东海洋大学 | Portable direct-reading type solubility nitrogen and phosphorus measuring device |
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Granted publication date: 20190716 Termination date: 20211024 |