CN103308432A - Continuous spectrum scattering type particle measurement method - Google Patents

Abstract

Translated fromChinese

一种连续光谱散射式颗粒测量方法。解决在光散射法颗粒粒度及浓度测量中，采用单一波长或几个波长的光源，在大散射角度接收的信号微弱、采样点少的问题。本发明将连续波长的光照射在样品颗粒上，产生散射信号。将一定散射角范围内的散射光会聚到一点，导入光谱仪进行分析，得到不同波长的散射信号分布。这些散射信号分布与颗粒的粒径有关，通过数据算法得到颗粒的粒度及浓度分布。本发明将大范围散射角度的光信号会聚到一点接收，提高信号强度；采用连续光谱光源和光谱仪分析信号，增加了信号采样点数量，提高了测量分辨率和信噪比。

A continuous spectrum scattering particle measurement method. Solve the problem of weak signal received at large scattering angle and few sampling points in the light scattering method of particle size and concentration measurement, using a single wavelength or several wavelengths of light source. The invention irradiates the light of continuous wavelength on the sample particles to generate scattering signals. Converge the scattered light within a certain range of scattering angles to one point, import it into a spectrometer for analysis, and obtain the distribution of scattering signals at different wavelengths. The distribution of these scattering signals is related to the particle size of the particles, and the particle size and concentration distribution of the particles are obtained through the data algorithm. The invention converges the light signals with a wide range of scattering angles to one point for reception, and improves the signal strength; adopts a continuous spectrum light source and a spectrometer to analyze the signals, increases the number of signal sampling points, and improves the measurement resolution and signal-to-noise ratio.

Description

Translated fromChinese

一种连续光谱散射式颗粒测量方法A Continuous Spectrum Scattering Particle Measurement Method

技术领域technical field

 本发明涉及一种连续光谱散射式颗粒测量方法。适用于颗粒粒度和浓度测量。The invention relates to a continuous spectrum scattering particle measurement method. Suitable for particle size and concentration measurement.

背景技术Background technique

随着工业进程的加快，和为适应环保工作的要求，需要对工业进程中的颗粒样品及环境中的颗粒进行测量。例如小于2.5微米的颗粒物称为PM2.5，它们对人体危害更大，需要重点测量。由于光散射测量方法直接获得颗粒的散射信号，其测量周期短，实时性好，被广泛研究和应用。光散射方法一般采用的入射光源为单一波长或几个波长的光源，在测量过程中，存在一些困难。With the acceleration of industrial processes, and in order to meet the requirements of environmental protection work, it is necessary to measure the particle samples in the industrial process and the particles in the environment. For example, particulate matter smaller than 2.5 microns is called PM2.5. They are more harmful to the human body and need to be measured intensively. Because the light scattering measurement method directly obtains the scattering signal of particles, its measurement period is short and its real-time performance is good, so it has been widely studied and applied. The incident light source generally adopted by the light scattering method is a light source of a single wavelength or several wavelengths, and there are some difficulties in the measurement process.

（1）小颗粒散射信号微弱，一般采用会聚式光路，测量区的颗粒少，代表性差，同时接收到的总的散射信号小。(1) The scattering signal of small particles is weak, and the converging optical path is generally used. There are few particles in the measurement area, and the representativeness is poor. At the same time, the total scattering signal received is small.

（2）接收端光电探测器少，采样点少，结果稳定性差，标定困难。(2) There are few photodetectors and sampling points at the receiving end, resulting in poor stability and difficult calibration.

（3）为了区分颗粒散射信号随散射角变化的特征，要求光电信号接收面积小，因而信噪比差。(3) In order to distinguish the characteristics of the particle scattering signal changing with the scattering angle, the receiving area of the photoelectric signal is required to be small, so the signal-to-noise ratio is poor.

发明内容Contents of the invention

本发明的目的是解决现有光散射测量颗粒粒度和浓度方法中，数据采样点少、信号微弱而影响测量结果的问题，提供一种基于连续光谱散射式颗粒测量方法。The purpose of the present invention is to solve the problem of few data sampling points and weak signals affecting the measurement results in the existing light scattering method for measuring particle size and concentration, and to provide a particle measurement method based on continuous spectrum scattering.

本发明提供的连续光谱散射式颗粒测量方法（如图1所示），具体步骤是：The continuous spectrum scattering particle measurement method provided by the present invention (as shown in Figure 1), the specific steps are:

由光源(1)发出连续波长的光经准直透镜(2)后照射在待测颗粒样品(3)中，经待测颗粒散射后由聚焦镜会聚于一点；The light of continuous wavelength emitted by the light source (1) passes through the collimating lens (2) and irradiates the particle sample (3) to be measured, and is converged at one point by the focusing mirror after being scattered by the particles to be measured;

将光谱仪(一般采用光纤导光)的接收端口(或光纤端口)置于聚焦镜的会聚点位置，待测颗粒的散射光信号导入光谱仪进行分析，得到不同波长散射光的强度分布，通过数据反演得到待测颗粒物粒度和浓度。The receiving port (or fiber port) of the spectrometer (generally using optical fiber light guide) is placed at the converging point of the focusing mirror, and the scattered light signal of the particle to be measured is introduced into the spectrometer for analysis to obtain the intensity distribution of scattered light at different wavelengths. Through data reflection The particle size and concentration of the particles to be measured can be obtained by derivation.

本发明方法涉及的这种激光粒度仪由连续波长光源(1)、准直透镜(2) 、聚焦镜(4)和光谱仪(6)组成。所述待测颗粒物位于准直透镜(2)和聚焦镜(4)之间。将连续波长的颗粒散射信号会聚到聚焦镜的一点，由光谱仪接收并进行分析。The laser particle size analyzer involved in the method of the present invention consists of a continuous wavelength light source (1), a collimating lens (2), a focusing mirror (4) and a spectrometer (6). The particles to be measured are located between the collimating lens (2) and the focusing mirror (4). Converge the continuous wavelength particle scattering signal to a point of the focusing mirror, receive and analyze it by the spectrometer.

 the

本发明的优点和积极效果：Advantage and positive effect of the present invention:

本发明提供的连续光谱散射式颗粒测量方法，将大范围散射角度的散射信号会聚后导入光谱仪，光电信号接收面积大，提高了信号强度；采用连续波长光谱的光源作为入射光，相应的散射信号由光谱仪分析，波长采样点多，数据信息丰富，提高测量结果的可靠性。The continuous spectrum scattering type particle measurement method provided by the present invention converges the scattering signals of a wide range of scattering angles and then imports them into the spectrometer, the photoelectric signal receiving area is large, and the signal strength is improved; the light source of the continuous wavelength spectrum is used as the incident light, and the corresponding scattering signals Analyzed by a spectrometer, there are many wavelength sampling points and rich data information, which improves the reliability of the measurement results.

 the

附图说明Description of drawings

图1是本发明提供的连续光谱散射式颗粒物测量方法示意图。Fig. 1 is a schematic diagram of the continuous spectrum scattering particle measurement method provided by the present invention.

图2是计算得到的散射光强度图谱。Figure 2 is the calculated scattered light intensity spectrum.

 the

具体实施方式Detailed ways

实施例1Example 1

图1所示为本发明提供的连续光谱散射式颗粒测量方法示意图。该方法所涉及的这种激光粒度仪包括：连续光谱光源(1)、准直透镜(2)、聚焦镜(4)和光谱仪(6)。Figure 1 is a schematic diagram of the continuous spectrum scattering particle measurement method provided by the present invention. The laser particle size analyzer involved in the method comprises: a continuous spectrum light source (1), a collimating lens (2), a focusing mirror (4) and a spectrometer (6).

该方法的具体步骤是：The concrete steps of this method are:

由光源(1)发出连续波长的光经准直透镜(2) 扩束准直后成为平行光，照射在待测颗粒样品(3) 样品场中，待测颗粒对光线发生散射，经待测颗粒散射后由聚焦镜(4)会聚到一点；The light of continuous wavelength emitted by the light source (1) becomes parallel light after being collimated by the collimator lens (2), and irradiates in the sample field of the particle sample (3) to be tested. After the particles are scattered, they are converged to one point by the focusing mirror (4);

将光谱仪(6) (一般采用光纤(5)导光)的接收端口(或光纤(5)端口)置于聚焦镜(4)的会聚点位置，颗粒对不同波长的光线散射后，频谱分布不同，经会聚后由光谱仪分析，可得到不同波长散射光谱的强度分布，该分布对应待测颗粒物的粒度和浓度信息，通过数据反演，可得待测颗粒粒度和浓度。Place the receiving port (or optical fiber (5) port) of the spectrometer (6) (generally using the optical fiber (5) to guide the light) at the converging point of the focusing mirror (4), after the particles scatter light of different wavelengths, the spectral distribution is different , after converging and analyzed by the spectrometer, the intensity distribution of the scattering spectrum at different wavelengths can be obtained. This distribution corresponds to the particle size and concentration information of the particles to be measured. Through data inversion, the particle size and concentration of the particles to be measured can be obtained.

图2是计算得到的散射光强图实例。其中颗粒粒度为0.1 - 2.5μm，光波波长为380 – 760nm，接收的散射角度为140 - 172度，将该接收散射角度范围内的光强会聚后进行归一化处理，得到图2中所示光强度图谱。由图2数据可见，对于不同的粒径，其散射光强随波长变化的趋势不同，通过求解矩阵方程可以得到粒度和浓度。Figure 2 is an example of the calculated scattered light intensity map. Among them, the particle size is 0.1-2.5μm, the light wavelength is 380-760nm, and the received scattering angle is 140-172 degrees. After the light intensity within the range of the received scattering angle is converged and normalized, the result shown in Figure 2 Light intensity spectrum. It can be seen from the data in Figure 2 that for different particle sizes, the scattered light intensity varies with wavelength in different trends, and the particle size and concentration can be obtained by solving the matrix equation.

Claims (3)

Translated fromChinese

1.一种连续光谱散射式颗粒测量方法，其特征在于该方法的具体步骤是：1. A continuous spectrum scattering type particle measurement method is characterized in that the concrete steps of the method are:由光源(1)发出连续波长的光经准直透镜(2)后照射在待测颗粒样品(3)中，经待测颗粒散射后由聚焦镜会聚于一点；The light of continuous wavelength emitted by the light source (1) passes through the collimating lens (2) and irradiates the particle sample (3) to be measured, and is converged at one point by the focusing mirror after being scattered by the particles to be measured;将光谱仪的接收端口或光纤端口置于聚焦镜的会聚点位置，待测颗粒的散射光信号导入光谱仪进行分析，得到不同波长散射光的强度分布，通过数据反演得到待测颗粒粒度和浓度。The receiving port or fiber port of the spectrometer is placed at the converging point of the focusing mirror, the scattered light signal of the particle to be measured is introduced into the spectrometer for analysis, and the intensity distribution of scattered light of different wavelengths is obtained, and the particle size and concentration of the particle to be measured are obtained through data inversion.2.根据权利要求1所述的方法，其特征在于所述光源(1)采用连续波长的光源。2. The method according to claim 1, characterized in that the light source (1) is a continuous wavelength light source.3.根据权利要求1或2所述的方法，其特征在于将大范围散射角度内颗粒的连续波长散射信号会聚到聚焦镜的一点后由光谱仪接收并进行分析。3. The method according to claim 1 or 2, characterized in that the continuous wavelength scattering signals of particles in a wide range of scattering angles are converged to a point of the focusing mirror and then received and analyzed by the spectrometer.

Images