CN104819964A - Position triangular wave frequency coding type imaging light measurement system - Google Patents

Abstract

The invention discloses a position triangular wave frequency coding type imaging light measurement system. The position triangular wave frequency coding type imaging light measurement system comprises a group of monochromatic light sources, a group of photosensitive devices and a computer; the monochromatic light sources and the photosensitive devices are linearly and uniformly arranged, wherein arrangement spaces are equal to each other; the monochromatic light sources and the photosensitive devices synchronously move along the linear distribution direction which is perpendicular to the monochromatic light sources and the sampling is performed on output signals of the photosensitive devices every a preset distance which is formed through movement; the monochromatic light sources are driven by different frequencies of triangle waves forming two times ratio relation and a monochromatic light combination through a sample and of the monochromatic light sources is received by the photosensitive devices respectively; the demodulation separation is performed on the monochromatic light combination through the computer to obtain a contribution of every monochromatic light source in the monochromatic light combination so as to implement the imaging on the sample. According to the position triangular wave frequency coding type imaging light measurement system, the measurement which is high in speed, large in information and high in accuracy is implemented, the structure and a circuit are simple, the device and process requirements are low, the debugging is easy, the reliability is high, and the like.

Description

The imaging measurement mechanism of a kind of position triangular wave frequency coding

Technical field

The present invention relates to imaging measurement mechanism field, particularly relate to the imaging measurement mechanism of a kind of position triangular wave frequency coding.

Background technology

By light, imaging is carried out to interior of articles in prior art, particularly imaging is carried out to inside of human body, there is the harmless outstanding advantages radiationless without wound, but not yet there is the face battle array imaging measuring system that can enter Clinical practice so far, its reason is that existing imaging measurement mechanism precision is low, quantity of information is less, cannot meet the needs in practical application.

Summary of the invention

The invention provides the imaging measurement mechanism of a kind of position triangular wave frequency coding, present invention achieves the high-acruracy survey of high speed, large information, meet the needs in practical application, described below:

The imaging measurement mechanism of a kind of position triangular wave frequency coding, described imaging measurement mechanism comprises: one group of monochromatic source, one group of photosensitive device, and the computing machine external with photosensitive device, one group of monochromatic source is distributed in the one side of sample, and one group of photosensitive device is distributed in the another side of sample;

Wherein, each photosensitive device in each monochromatic source in one group of monochromatic source, one group of photosensitive device is linear evenly distributed, and arrangement pitch is identical;

Monochromatic source and photosensitive device synchronously move along the linear distribution direction of vertical single color light source, and often the mobile output signal of a predeterminable range to photosensitive device is sampled;

Adopt different frequency and become the triangular wave of 2 times of ratio to drive each monochromatic source in one group of monochromatic source respectively, in one group of photosensitive device, each photosensitive device receives each monochromatic source and combines through the monochromatic light of sample;

Computing machine carries out to monochromatic light combination the contribution that demodulation is separated each monochromatic source obtained in monochromatic light combination, realizes the imaging to sample accordingly.

Wherein, monochromatic source and photosensitive device are symmetrical arranged on sample two sides.

Described monochromatic source is laser diode, and described photosensitive device is photodiode.

Another embodiment, described monochromatic source is monochrome photodiode, and described photosensitive device is photodiode.

Another embodiment, described monochromatic source is monochromatic filter plate to the monochromatic filter plate of monochromatic light after white light filtering, and described photosensitive device is photodiode.

Another embodiment, described monochromatic source is laser diode, and described photosensitive device is photomultiplier.

Another embodiment, described monochromatic source is monochrome photodiode, and described photosensitive device is photomultiplier.

Another embodiment, described monochromatic source be monochromatic filter plate to monochromatic light after white light filtering, described photosensitive device is photomultiplier.

The beneficial effect of technical scheme provided by the invention is: the present invention adopts different frequency and becomes the triangular wave of 2 times of ratio to drive monochromatic source, the contribution that separation can obtain each monochromatic source in monochromatic light combination is carried out to the photosignal that photosensitive device detects, and then the imaging realized sample, present invention achieves the high-acruracy survey of high speed, large information, and there is structure and circuit is simple, device and technological requirement is low, debugging easily, high reliability.

Accompanying drawing explanation

Fig. 1 is the structural representation of the imaging measurement mechanism of a kind of position triangular wave frequency coding;

Fig. 2 is monochromatic source provided by the invention, sample and photosensitive device relative position schematic diagram;

Fig. 3 is triangular wave pumping signal schematic diagram.

In accompanying drawing, the list of parts representated by each label is as follows:

1: one group of monochromatic source; 2: sample;

3: one groups of photosensitive devices.

Embodiment

For making the object, technical solutions and advantages of the present invention clearly, below embodiment of the present invention is described further in detail.

Embodiment 1

An imaging measurement mechanism for position triangular wave frequency coding, see Fig. 1, Fig. 2 and Fig. 3, described imaging measurement mechanism comprises: one group n monochromatic source 1 (LD ₁lD _n) and one group n photosensitive device 3 (PD ₁pD _n) (n is odd number, then middle light source or photosensitive device can be used as center line, is convenient to aim at arrangement, and wherein, the concrete value of n is relevant to the cross-sectional area of sample 2, and the embodiment of the present invention does not limit this); One group of monochromatic source 1 is distributed in the one side of sample 2, and one group of photosensitive device 3 is distributed in the another side of sample 2;

Wherein, each monochromatic source LD in one group of monochromatic source 1 ₁lD _n, each photosensitive device PD in one group of photosensitive device 3 ₁pD _nlinear evenly distributed, arrangement pitch is identical.This imaging measurement mechanism also comprises the computing machine (not shown) external with one group of photosensitive device 3.

Preferred monochromatic source 1 and photosensitive device 3 are symmetrical arranged on sample two sides, and monochromatic source 1 and photosensitive device 3 can synchronously move along the linear distribution direction of vertical single color light source 1, and often the mobile output signal of a predeterminable range to photosensitive device 3 is sampled.

Preferred n × n photosensitive device 3 quadrate arranges, and monochromatic source 1 is all spaced by identical with photosensitive device 3, the centre position of the corresponding photosensitive device 3 of arranging line of monochromatic source 1.

Monochromatic source 1 and photosensitive device 3 can synchronously move along the linear distribution direction of vertical single color light source 1, and often the mobile output signal of a predeterminable range to photosensitive device 3 is sampled.

See Fig. 3, adopt different frequency and become the triangular wave of 2 times of ratio to drive each monochromatic source LD in one group of monochromatic source 1 respectively _ij, each photosensitive device PD in one group of photosensitive device 3 _ijreceive each monochromatic source LD _ijthrough the monochromatic light combination I of sample 2 _ij; Computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each monochromatic source LD _ijcontribution, imaging can be carried out to sample 2 accordingly.

That is, according to each just to the light intensity that the photosensitive device of monochromatic source receives, backprojection reconstruction obtains the transmission image of sample 2, and the photosensitive device of other positions obtains the information of this wavelength as auxiliary, strengthening image information.According to the organizational information in graphical analysis sample 2, determine the scattering degree information of sample tissue.

Wherein, computing machine combines I to monochromatic light _ijcarry out separation and can obtain monochromatic light combination I _ijin each monochromatic source LD _ijthe step of contribution be specially:

1) LD to drive monochromatic source is supposed _jhighest frequency f _max(f in these cases _max=f ₁) 4M speed sampling f is carried out to photosignal _s=4M × f _max, obtain sampled signal x (m), wherein M be more than or equal to 1 positive integer;

$x\left(m\right)=\underset{i=0}{\overset{M-1}{\mathrm{\Σ}}}x(4\mathrm{lm}+i),l=\mathrm{0,1,2},......\left(1\right)$

2) computing machine will add up to the sampled signal in the positive and negative half period in each triangular wave cycle corresponding to each wavelength respectively, and accumulation result carries out asking difference operation;

That is, obtain cumulative sum by cumulative for the sampled value of the positive half period of each triangular wave in certain hour (an integer triangular wave cycle), the sampled value of the negative half period of each triangular wave is cumulative obtains cumulative sum, and these two cumulative sums are subtracted each other.

3) difference of each wavelength above-mentioned is carried out k cycle or an integral multiple k periodic accumulation, the spectral value of each wavelength can be obtained.Wherein:

$k=\frac{a\frac{1}{f_{\min }}}{\frac{1}{f_n}}---\left(2\right)$

In formula: f _minfor the low-limit frequency in excitation triangular wave; A is preset constant, value be more than or equal to 1 positive integer, a/f _minfor the cycle of lower sampling; f _nfor the triangular wave excitation frequency of handled wavelength.

To amplitude be x be sampled value, if uniform sampling N (>>1) puts and is averaged within the regular hour, the mean value obtained is

$\stackrel{\‾}{x}=\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\left[x_i\right]=\frac{1}{N}N\left(\right[x]+{\mathrm{\Δx}}_i)=\left[x\right]+{\mathrm{\Δx}}_i---\left(3\right)$

Wherein, [x] is that analog to digital converter quantizes x, is also the positive integer that round off rounding obtains.X _ithe amplitude of i-th, [x _i] be that analog to digital converter is to x _iquantizing, is also the positive integer that round off rounding obtains.(3) formula shows, the signal sampling one being compared to " totally " is repeatedly averaged, and can not improve its precision, and the error of the mean value obtained is identical with the error of unitary sampling, is Δ x _i.

If to amplitude be x be sampled sawtooth wave, within the regular hour, uniform sampling N (>>1) puts and is averaged equally, and the mean value obtained is

$\stackrel{\‾}{x}=\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\left[x_i\right]=\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}[m_i+{\mathrm{\Δx}}_i]---\left(4\right)$

Wherein, x _i=m _i+ Δ x _i, m _i=[x _i].Also be m _ithat rounding obtains positive integer, and Δ x _iit is " at random " error of losing after being rounded.

(5) formula can utilize arithmetic series sum formula to obtain further:

$\begin{array}{c}\stackrel{\‾}{x}=\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{m}_i+\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{\mathrm{\Δx}}_i=\frac{1}{N}\frac{1}{2}(0+[x\left]\right)N+\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{\mathrm{\Δx}}_i\\ =\frac{1}{2}\left[x\right]+\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{\mathrm{\Δx}}_i\end{array}---\left(5\right)$

(5) the last item in formula is the value after quantizing, although less than the result of (3) formula half, according to theory of errors, the precision of data does not change because being multiplied by a fixing non-zero constant.But be the random number of zero-mean in one next, compare will reduce in (3) formula doubly, therefore, the effect of the precision that can be improved equally after over-sampling is carried out to sawtooth wave or triangular wave pumping signal, and do not need another external high-frequency disturbing signal.

The embodiment of the present invention is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as can complete the device of above-mentioned functions.

Embodiment 2

An imaging measurement mechanism for position triangular wave frequency coding, see Fig. 1, Fig. 2 and Fig. 3, this embodiment is using laser diode as monochromatic source LD ₁lD _n, photodiode is as photosensitive device PD ₁pD _nfor example is described.

Adopt different frequency and become the triangular wave of 2 times of ratio to drive each laser diode LD in one group of monochromatic source 1 respectively _ij, each photosensitive device PD in one group of photosensitive device 3 _ijreceive each laser diode LD _ijthrough the monochromatic light combination I of sample 2 _ij; Computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each laser diode LD _ijcontribution, imaging can be carried out to sample 2 accordingly.

Wherein, computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each laser diode LD _ijthe step of contribution identical with embodiment 1, the embodiment of the present invention does not repeat this.

The embodiment of the present invention is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as can complete the device of above-mentioned functions.

Embodiment 3

An imaging measurement mechanism for position triangular wave frequency coding, see Fig. 1, Fig. 2 and Fig. 3, this embodiment is using monochrome photodiode as monochromatic source LD ₁lD _n, photodiode is as photosensitive device PD ₁pD _nfor example is described.

Adopt different frequency and become the triangular wave of 2 times of ratio to drive each monochrome photodiode LD in one group of monochromatic source 1 respectively _ij, each photodiode PD in one group of photosensitive device 3 _ijreceive each monochrome photodiode LD _ijthrough the monochromatic light combination I of sample 2 _ij; Computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each monochrome photodiode LD _ijcontribution, imaging can be carried out to sample 2 accordingly.

Wherein, computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each monochrome photodiode LD _ijthe step of contribution identical with embodiment 1, the embodiment of the present invention does not repeat this.

The embodiment of the present invention is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as can complete the device of above-mentioned functions.

Embodiment 4

An imaging measurement mechanism for position triangular wave frequency coding, see Fig. 1, Fig. 2 and Fig. 3, this embodiment using monochromatic filter plate to monochromatic light after white light filtering as monochromatic source LD ₁lD _n, photodiode is as photosensitive device PD ₁pD _nfor example is described.

Adopt different frequency and become the triangular wave of 2 times of ratio to drive each monochromatic filter plate in one group of monochromatic source 1 to monochromatic light LD after white light filtering respectively _ij, each photodiode PD in one group of photosensitive device 3 _ijreceive each monochromatic light LD _ijthrough the monochromatic light combination I of sample 2 _ij; Computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each monochromatic light LD _ijcontribution, imaging can be carried out to sample 2 accordingly.

Wherein, computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each monochromatic light LD _ijthe step of contribution identical with embodiment 1, the embodiment of the present invention does not repeat this.

The embodiment of the present invention is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as can complete the device of above-mentioned functions.

Embodiment 5

An imaging measurement mechanism for position triangular wave frequency coding, see Fig. 1, Fig. 2 and Fig. 3, this embodiment is using laser diode as monochromatic source LD ₁lD _n, photomultiplier is as photosensitive device PD ₁pD _nfor example is described.

Adopt different frequency and become the triangular wave of 2 times of ratio to drive each laser diode LD in one group of monochromatic source 1 respectively _ij, each photomultiplier PD in one group of photosensitive device 3 _ijreceive each laser diode LD _ijthrough the monochromatic light combination I of sample 2 _ij; Computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each laser diode LD _ijcontribution, imaging can be carried out to sample 2 accordingly.

Wherein, computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each laser diode LD _ijthe step of contribution identical with embodiment 1, the embodiment of the present invention does not repeat this.

The embodiment of the present invention is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as can complete the device of above-mentioned functions.

Embodiment 6

An imaging measurement mechanism for position triangular wave frequency coding, see Fig. 1, Fig. 2 and Fig. 3, this embodiment is using monochrome photodiode as monochromatic source LD ₁lD _n, photomultiplier is as photosensitive device PD ₁pD _nfor example is described.

Adopt different frequency and become the triangular wave of 2 times of ratio to drive each monochrome photodiode LD in one group of monochromatic source 1 respectively _ij, each photomultiplier PD in one group of photosensitive device 3 _ijreceive each monochrome photodiode LD _ijthrough the monochromatic light combination I of sample 2 _ij; Computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each monochrome photodiode LD _ijcontribution, imaging can be carried out to sample 2 accordingly.

Wherein, computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each monochrome photodiode LD _ijthe step of contribution identical with embodiment 1, the embodiment of the present invention does not repeat this.

The embodiment of the present invention is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as can complete the device of above-mentioned functions.

Embodiment 7

An imaging measurement mechanism for position triangular wave frequency coding, see Fig. 1, Fig. 2 and Fig. 3, this embodiment using monochromatic filter plate to monochromatic light after white light filtering as monochromatic source LD ₁lD _n, photomultiplier is as photosensitive device PD ₁pD _nfor example is described.

Adopt different frequency and become the triangular wave of 2 times of ratio to drive each monochromatic filter plate in one group of monochromatic source 1 to monochromatic light LD after white light filtering respectively _ij, each photomultiplier PD in one group of photosensitive device 3 _ijreceive each monochromatic light LD _ijthrough the monochromatic light combination I of sample 2 _ij; Computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each monochromatic light LD _ijcontribution, imaging can be carried out to sample 2 accordingly.

Wherein, computing machine combines I to monochromatic light _ijcarry out demodulation separation and can obtain monochromatic light combination I _ijin each monochromatic light LD _ijthe step of contribution identical with embodiment 1, the embodiment of the present invention does not repeat this.

The embodiment of the present invention is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as can complete the device of above-mentioned functions.

It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (8)

1. the imaging measurement mechanism of a position triangular wave frequency coding, described imaging measurement mechanism comprises: one group of monochromatic source, one group of photosensitive device, and the computing machine external with photosensitive device, it is characterized in that, one group of monochromatic source is distributed in the one side of sample, and one group of photosensitive device is distributed in the another side of sample;

Wherein, each photosensitive device in each monochromatic source in one group of monochromatic source, one group of photosensitive device is linear evenly distributed, and arrangement pitch is identical;

Monochromatic source and photosensitive device synchronously move along the linear distribution direction of vertical single color light source, and often the mobile output signal of a predeterminable range to photosensitive device is sampled;

Adopt different frequency and become the triangular wave of 2 times of ratio to drive each monochromatic source in one group of monochromatic source respectively, in one group of photosensitive device, each photosensitive device receives each monochromatic source and combines through the monochromatic light of sample;

Computing machine carries out to monochromatic light combination the contribution that demodulation is separated each monochromatic source obtained in monochromatic light combination, realizes the imaging to sample accordingly.

2. the imaging measurement mechanism of a kind of position according to claim 1 triangular wave frequency coding, it is characterized in that, monochromatic source and photosensitive device are symmetrical arranged on sample two sides.

3. the imaging measurement mechanism of a kind of position according to claim 1 triangular wave frequency coding, it is characterized in that, described monochromatic source is laser diode, and described photosensitive device is photodiode.

4. the imaging measurement mechanism of a kind of position according to claim 1 and 2 triangular wave frequency coding, it is characterized in that, described monochromatic source is monochrome photodiode, and described photosensitive device is photodiode.

5. a kind of position according to claim 1 and 2 triangular wave frequency coding imaging measurement mechanism, it is characterized in that, described monochromatic source be monochromatic filter plate to monochromatic light after white light filtering, described photosensitive device is photodiode.

6. the imaging measurement mechanism of a kind of position according to claim 1 and 2 triangular wave frequency coding, it is characterized in that, described monochromatic source is laser diode, and described photosensitive device is photomultiplier.

7. the imaging measurement mechanism of a kind of position according to claim 1 and 2 triangular wave frequency coding, it is characterized in that, described monochromatic source is monochrome photodiode, and described photosensitive device is photomultiplier.

8. a kind of position according to claim 1 and 2 triangular wave frequency coding imaging measurement mechanism, it is characterized in that, described monochromatic source be monochromatic filter plate to monochromatic light after white light filtering, described photosensitive device is photomultiplier.