CN204086559U - A kind of absorber array for measuring high flux X-ray energy spectrum - Google Patents

Abstract

A kind of absorber array for measuring high flux X-ray energy spectrum, be made up of the absorber of different length, the principle of design of the absorber of described different length is homenergic interval decay principle, namely when the X-ray energy of incidence in tested energy range be uniformly distributed time, after the decay of absorber array, the energy attenuation of the X ray of outgoing is equally spaced.The utility model has the advantages that between data discrete from one another, crosstalk reduces, and spectrum unscrambling precision improves.

Description

A kind of absorber array for measuring high flux X-ray energy spectrum

Technical field

The utility model relates to a kind of absorber array for measuring high flux X-ray energy spectrum, belongs to X-ray energy spectrum field of measuring technique.

Background technology

The power spectrum of current domestic measurement high flux medium energy X_ray has multiple method, wherein has MLS (Multi-Layer Stack) method, harmonics elimination etc.

MLS method is that one deck medium and detector form one and detect and save, and multiple detection joint is along measuring axle lineal layout and composition measuring apparatus.The intensity of multilayered medium to X ray repeatedly decays, pass through response function, solve ray energy spectrum (see " the MLS method for high-energy X-rays spectral measurement " Chen Nan, Jing Xiaobing, peak, Zhang Linwen, cloudy pool is outstanding, Li Shiping, Fluid Physics Inst., China Engineering Physics Academy, modern physics system of China Science & Technology University).As shown in Figure 1, one deck medium and a detector are alternately placed, and have a detector, thus can obtain a series of by the X-ray intensity after Absorption of Medium, by certain anti-resolving Algorithm, calculate X-ray energy spectrum after every layer of medium.Harmonics elimination is that incident X ray changes fluorescence into after filter disc, is detected device and receives, by fluorescent line computing formula, calculate the power spectrum of X ray.(see " filtering one fluorescence method measures the analog computation of x-ray spectroscopy " Wang Dong, nuclear physics and chemistry institute).

Existing apparatus obtains a series of data, there is mutual crosstalk between data, affects spectrum unscrambling precision.Absorber Array Design adopts the principle at homenergic interval, discrete from one another between data, and crosstalk reduces, and spectrum unscrambling precision improves.

Utility model content

Technology of the present utility model is dealt with problems and is: crosstalk mutually between the data overcoming prior art, spectrum unscrambling low precision, a kind of absorber array for measuring high flux X-ray energy spectrum is provided, this array adopts the principle of design at homenergic interval, discrete from one another between data, crosstalk reduces, and spectrum unscrambling precision improves.

Technical solution of the present utility model: a kind of absorber array for measuring high flux X-ray energy spectrum, it is characterized in that: described absorber array forms an array by the absorber of a series of columniform different length, and the axle of the absorber of columniform different length is arranged in parallel; The principle of design of the absorber of described different length is homenergic interval decay principle, namely when the X-ray energy of incidence in tested energy range be uniformly distributed time, after the decay of absorber array, the energy attenuation of the X ray of outgoing is equally spaced.

When the X-ray energy of incidence in tested energy range be uniformly distributed time, the X-ray energy of described outgoing is respectively the 100%-x of incident gross energy, 100%-2x, 100%-3x ... 100%-nx, 0<x<1/n, n represents absorber array number, and x represents attenuation percentage.

The utility model advantage is compared with prior art: the absorber selection principle of different length is homenergic interval, this brand-new design philosophy, advantage is that measurement data compares dispersion, do not interfere with each other mutually, therefore error is little, the X-ray energy spectrum obtained thus is more accurate, measures energy spectrum larger., inevitably there is the mutual crosstalk between data in existing measuring method, affects the scope of measuring accuracy and measurement power spectrum.

Accompanying drawing explanation

Fig. 1 is absorber array schematic diagram of the present utility model;

Fig. 2 is the relation curve of transmission X-ray energy and absorber length.

Embodiment

The array that the aluminium matter absorber being illustrated in figure 1 columniform different length is formed, the axle of the absorber of columniform different length is arranged in parallel; The Design of length principle of absorber array is homenergic interval decay principle, and length is respectively 3mm, and 6mm, 9mm, 13mm, 19mm, 25mm, 36mm, 54mm are namely after absorber decay, and the energy attenuation of the X ray of outgoing is equally spaced.When the X-ray energy of incidence in tested energy range be uniformly distributed time, emanated energy is respectively 80% of incident gross energy, 70%, 60%, 50%, 40%, 30%, 20%, 10%.

X ray passes through collimating aperture, decayed by the absorber part of built-in different length simultaneously, the X ray of outgoing is detected by photoelectric probe, the varying strength of the X ray after a series of decay is obtained through the process of backend electronics system, as shown in Figure 2, again in conjunction with the response function of absorber, utilize anti-resolving Algorithm, the power spectrum of anti-X ray when solving high flux.

Anti-resolving Algorithm is as follows:

If X-ray energy spectrum is by ENERGY E discretize, Q conventional point E can be obtained _k, then the discrete power spectrum of X ray can be expressed as namely energy is E _kthe intensity share of X ray, wherein K=1,2 ..., Q;

One has 8 detectors, and the absorbed thickness that i-th detector is corresponding is d _i, i=1,2 ..., 8, be E for energy _kx ray, if its do not decayed by absorber before intensity be I ₀(E _k), and set the absorption coefficient of absorber as μ (E _k), then absorber the decaying to X ray that i-th detector is corresponding:

$\frac{I_i\left(E_k\right)}{I_0\left(E_k\right)}=e^{-u\left(E_k\right)d_i}$

Wherein I _i(E _k) for energy be E _kx ray through thickness be d _iabsorber after intensity in transmission, i=1 ..., 8

So the total intensity of X ray that i-th detector receives is:

$I_{\det \mathrm{ected}}^i=\underset{k=1}{\overset{8}{\mathrm{\&Sigma;}}}\mathrm{\&epsiv;}\left(E_k\right)I_0\left(E_k\right)e^{-\mathrm{\&mu;}\left(E_k\right)d_i}$

ε (E _k) be detector be E to energy _kthe detection efficiency of X ray.

Wherein, ε (E _k), μ (E _k), d _iknown quantity, can be obtained in conjunction with electronic system measurement by detector.Therefore only I is had ₀(E _k) be unknown number, be equivalent to a Q unit linear function group.

Measured string number is less than pulse height and quantizes number Q, needs to adopt iteration in conjunction with the method for MC to separate this system of equations.

Current the utility model, for medium energy X_ray plasma measurement system, is measured and is obtained high flux X-ray energy spectrum, achieve good effect.

There is provided above embodiment to be only used to describe the purpose of this utility model, and do not really want to limit scope of the present utility model.Scope of the present utility model is defined by the following claims.Do not depart from spirit of the present utility model and principle and the various equivalent substitutions and modifications made, all should be encompassed within scope of the present utility model.

Claims (2)

1. for measuring an absorber array for high flux X-ray energy spectrum, it is characterized in that: described absorber array forms an array by the absorber of a series of columniform different length, and the axle of the absorber of columniform different length is arranged in parallel; The principle of design of the absorber of described different length is homenergic interval decay principle, namely when the X-ray energy of incidence in tested energy range be uniformly distributed time, after the decay of absorber array, the energy attenuation of the X ray of outgoing is equally spaced.

2. absorber array according to claim 1, it is characterized in that: when the X-ray energy of incidence in tested energy range be uniformly distributed time, the X-ray energy of described outgoing is respectively the 100%-x of incident gross energy, 100%-2x, 100%-3x ... 100%-nx, 0<x<1/n, n represent absorber array number, and x represents attenuation percentage.