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

Abstract

The invention discloses an imaging light measuring device with position triangular wave frequency encoding, the imaging light measuring device comprises: each monochromatic light source in a group of monochromatic light sources, and each photosensitive device in a group of photosensitive devices are arranged in a linear and uniform manner , the arrangement interval is the same; the monochromatic light source and the photosensitive device move synchronously along the linear distribution direction of the vertical monochromatic light source, and the output signal of the photosensitive device is sampled every time a preset distance is moved; the triangular waves with different frequencies and a 2-fold ratio are used respectively Drive each monochromatic light source in a group of monochromatic light sources, and each photosensitive device in a group of photosensitive devices receives the monochromatic light combination of each monochromatic light source passing through the sample; the computer demodulates and separates the monochromatic light combination to obtain a single The contribution of each monochromatic light source in the color light combination, according to which the imaging of the sample is realized. The invention realizes high-speed and large-information high-precision measurement, and has the advantages of simple structure and circuit, low device and process requirements, easy debugging, high reliability and the like.

Description

An Imaging Optical Measuring Device with Position Triangular Wave Frequency Encoding

technical field

The invention relates to the field of imaging optical measuring devices, in particular to an imaging optical measuring device with position triangular wave frequency encoding.

Background technique

In the prior art, imaging the interior of objects, especially the interior of the human body, has the outstanding advantages of being non-destructive, non-invasive, and non-radiative through light. However, there is no area array imaging optical measurement system that can be used clinically. The imaging light measuring device of the present invention has low precision and small amount of information, which cannot meet the needs of practical applications.

Contents of the invention

The present invention provides an imaging optical measurement device with position triangular wave frequency encoding. The present invention realizes high-speed, high-precision measurement of large information and meets the needs of practical applications. See the following description for details:

An imaging light measuring device with position triangular wave frequency encoding, the imaging light measuring device includes: a group of monochromatic light sources, a group of photosensitive devices, and a computer connected externally to the photosensitive devices, a group of monochromatic light sources are distributed on one side of the sample, A group of photosensitive devices are distributed on the other side of the sample;

Wherein, each monochromatic light source in a group of monochromatic light sources and each photosensitive device in a group of photosensitive devices are arranged linearly and uniformly, with the same arrangement interval;

The monochromatic light source and the photosensitive device move synchronously along the linear distribution direction of the vertical monochromatic light source, and the output signal of the photosensitive device is sampled every time a preset distance is moved;

Each monochromatic light source in a group of monochromatic light sources is driven separately by triangular waves with different frequencies and a ratio of 2 times, and each photosensitive device in a group of photosensitive devices receives the combination of monochromatic light transmitted by each monochromatic light source through the sample;

The computer demodulates and separates the monochromatic light combination to obtain the contribution of each monochromatic light source in the monochromatic light combination, thereby realizing the imaging of the sample.

Among them, the monochromatic light source and the photosensitive device are arranged symmetrically on both sides of the sample.

The monochromatic light source is a laser diode, and the photosensitive device is a photosensitive diode.

In another embodiment, the monochromatic light source is a monochromatic diode, and the photosensitive device is a photosensitive diode.

In another embodiment, the monochromatic light source is a monochromatic light monochromatic filter after white light is filtered by a monochromatic filter, and the photosensitive device is a photosensitive diode.

In another embodiment, the monochromatic light source is a laser diode, and the photosensitive device is a photomultiplier tube.

In another embodiment, the monochromatic light source is a monochromatic diode, and the photosensitive device is a photomultiplier tube.

In another embodiment, the monochromatic light source is monochromatic light filtered by a monochromatic filter, and the photosensitive device is a photomultiplier tube.

The beneficial effects of the technical solution provided by the present invention are: the present invention uses triangular waves with different frequencies and a 2-fold ratio to drive the monochromatic light source, and separates the photoelectric signals detected by the photosensitive device to obtain each monochromatic light in the monochromatic light combination. The contribution of the light source, and then realize the imaging of the sample, the invention realizes high-speed, high-precision measurement of large information, and has the advantages of simple structure and circuit, low device and process requirements, easy debugging, and high reliability.

Description of drawings

Fig. 1 is a structural schematic diagram of an imaging optical measurement device for position triangular wave frequency encoding;

Figure 2 is a schematic diagram of the relative positions of a monochromatic light source, a sample and a photosensitive device provided by the present invention;

Fig. 3 is a schematic diagram of a triangular wave excitation signal.

In the accompanying drawings, the list of parts represented by each label is as follows:

1: a group of monochromatic light sources; 2: samples;

3: A group of photosensitive devices.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

Example 1

An imaging optical measuring device with position triangular wave frequency encoding, see Fig. 1, Fig. 2 and Fig. 3, said imaging optical measuring device includes: a group of n monochromatic light sources 1 (LD ₁ ... LD _n ) and a group of n Photosensitive device 3 (PD ₁ ... PD _n ) (n is an odd number, the middlemost light source or photosensitive device can be used as the center line, which is convenient for alignment and arrangement. The specific value of n is related to the cross-sectional area of sample 2. This The embodiment of the invention does not limit this); a group of monochromatic light sources 1 are distributed on one side of the sample 2, and a group of photosensitive devices 3 are distributed on the other side of the sample 2;

Wherein, each monochromatic light source LD ₁ . . . LD _n in a group of monochromatic light sources ₁ , and each photosensitive device PD ₁ . The imaging light measurement device also includes a computer (not shown in the figure) connected externally to a group of photosensitive devices 3 .

Preferably, the monochromatic light source 1 and the photosensitive device 3 are symmetrically arranged on both sides of the sample, and the monochromatic light source 1 and the photosensitive device 3 can be moved synchronously along the linear distribution direction of the vertical monochromatic light source 1, and the output signal of the photosensitive device 3 is greatly affected by each preset distance of movement. Take a sample.

Preferably n×n photosensitive devices 3 are arranged in a square, monochromatic light sources 1 and photosensitive devices 3 are arranged at the same interval, and the arrangement line of monochromatic light sources 1 corresponds to the middle position of photosensitive devices 3 .

The monochromatic light source 1 and the photosensitive device 3 can move synchronously along the linear distribution direction vertical to the monochromatic light source 1, and the output signal of the photosensitive device 3 is sampled every time a preset distance is moved.

Referring to Fig. 3, each monochromatic light source LD _ij in a group of monochromatic light sources 1 is respectively driven by triangular waves with different frequencies and a ratio of 2 times, and each photosensitive device PD _ij in a group of photosensitive devices 3 receives each monochromatic The light source LD _ij passes through the monochromatic light combination I _ij of sample 2; the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each monochromatic light source LD _ij in the monochromatic light combination I _ij , and thus can be used for Sample 2 was imaged.

That is, according to the light intensity received by each photosensitive device facing the monochromatic light source, the transmission image of sample 2 is obtained through back projection reconstruction, while the photosensitive devices at other positions obtain the information of the wavelength as an auxiliary to enhance the image information. The tissue information in the sample 2 is analyzed according to the image, and the scattering degree information of the sample tissue is determined.

Wherein, the steps for the computer to separate the monochromatic light combination I _ij to obtain the contribution of each monochromatic light source LD _ij in the monochromatic light combination I _ij are as follows:

1) Assuming that the photoelectric signal is sampled at a speed 4M times faster than the highest frequency f _max of the LD _j driving the monochromatic light source (f _max =f ₁ in the above case), f _s =4M×f _max , to obtain the sampled signal x(m) , where M is a positive integer greater than or equal to 1;

$\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}}{\overset{\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; lm</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0,1,2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

2) The computer will accumulate the sampling signals in the positive and negative half periods of each triangle wave period corresponding to each wavelength, and perform a difference operation on the accumulated results;

That is, the cumulative sum is obtained by accumulating the sampling values of the positive half period of each triangular wave within a certain period of time (integer number of triangular wave periods), and the cumulative sum is obtained by accumulating the sampling values of the negative half period of each triangular wave. Subtract.

3) The difference values of the above wavelengths are accumulated for k cycles or integer multiples of k cycles to obtain the spectral value of each wavelength. in:

$\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; a</span>}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

In the formula: f _min is the lowest frequency in the excitation triangular wave; a is a preset constant, the value is a positive integer greater than or equal to 1, a/f _min is the period of down-sampling; f _n is the excitation frequency of the triangular wave of the processed wavelength .

For the sampled value whose amplitude is x, if N(>>1) points are evenly sampled and averaged within a certain period of time, the average value obtained is

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; (</span><span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span><span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Wherein, [x] is the quantization of x by the analog-to-digital converter, that is, a positive integer obtained by rounding off. x _i is the amplitude of point i, and [ _xi ] is the quantization of x _i by the analog-to-digital converter, that is, a positive integer obtained by rounding off. Equation (3) shows that sampling a relatively "clean" signal multiple times to average does not improve its accuracy, and the error of the obtained average value is the same as that of a single sampling, which is Δx _i .

If the sampled sawtooth wave with an amplitude of x is uniformly sampled at N(>>1) points within a certain period of time and averaged, the average value obtained is

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Wherein, x _i =m _i + _{Δxi , m i =[xi ] .} That is to say, _{mi is rounded to obtain a positive integer, and Δx i is} a "random" error discarded after being rounded.

Formula (5) can be further obtained by using the arithmetic series summation formula:

$\begin{array}{c}\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; \&Delta;x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; \&Delta;x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}\\ <span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; \&Delta;x</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}\end{array}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

The first term in formula (5) is the quantized value, although it is half smaller than the result of formula (3), but according to the error theory, the accuracy of a data will not be changed by multiplying by a fixed non-zero constant. However, the latter item is a random number with zero mean value, which is lower than that in (3) Therefore, oversampling the sawtooth wave or triangular wave excitation signal can also achieve the effect of improving the accuracy, and there is no need to add high-frequency disturbance signals.

In the embodiments of the present invention, unless otherwise specified, the models of the devices are not limited, as long as they can complete the above functions.

Example 2

An imaging light measuring device with position triangular wave frequency encoding, see Fig. 1, Fig. 2 and Fig. 3. In this embodiment, a laser diode is used as a monochromatic light source LD ₁ ... LD _n , and a photosensitive diode is used as a photosensitive device PD ₁ ... PD _n as an example Be explained.

Each laser diode LD _ij in a group of monochromatic light sources 1 is driven by triangular waves with different frequencies and a ratio of 2 times, and each photosensitive device PD _ij in a group of photosensitive devices 3 receives each laser diode LD _ij through the sample 2 monochromatic light combination I _ij ; the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each laser diode LD _ij in the monochromatic light combination I _ij , based on which the sample 2 can be imaged.

Wherein, the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each laser diode LD _ij in the monochromatic light combination I _ij .

In the embodiments of the present invention, unless otherwise specified, the models of the devices are not limited, as long as they can complete the above functions.

Example 3

An imaging optical measuring device with position triangular wave frequency encoding, see Fig. 1, Fig. 2 and Fig. 3, this embodiment uses monochromatic diodes as monochromatic light sources LD ₁ ... LD _n , and photosensitive diodes as photosensitive devices PD ₁ ... PD _n as Example to illustrate.

Each monochromatic diode LD _ij in a group of monochromatic light sources 1 is driven by triangular waves with different frequencies and a ratio of 2 times, and each photosensitive diode PD _ij in a group of photosensitive devices 3 receives the transmission of each monochromatic diode LD _ij through the monochromatic light combination I _ij of sample 2; the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each monochromatic diode LD _ij in the monochromatic light combination I _ij , based on which the sample 2 can be imaged .

Wherein, the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each monochromatic diode LD _ij in the monochromatic light combination I _ij .

In the embodiments of the present invention, unless otherwise specified, the models of the devices are not limited, as long as they can complete the above functions.

Example 4

An imaging light measuring device with position triangular wave frequency encoding, see Fig. 1, Fig. 2 and Fig. 3. In this embodiment, the monochromatic light filtered by the monochromatic filter is used as the monochromatic light source LD ₁ ... LD _n , and the photosensitive diode is used as the monochromatic light source. The photosensitive devices PD ₁ . . . PD _n are taken as an example for illustration.

Triangular waves with different frequencies and a ratio of 2 times are used to respectively drive each monochromatic filter in a group of monochromatic light sources 1 to filter the monochromatic light LD _ij of white light, and each photodiode PD _ij in a group of photosensitive devices 3 receives Each monochromatic light LD _ij passes through the monochromatic light combination I _ij of sample 2; the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each monochromatic light LD _ij in the monochromatic light combination I _ij , Sample 2 can thus be imaged.

Wherein, the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each monochromatic light LD _ij in the monochromatic light combination I _ij .

In the embodiments of the present invention, unless otherwise specified, the models of the devices are not limited, as long as they can complete the above functions.

Example 5

An imaging optical measuring device with position triangular wave frequency encoding, see Fig. 1, Fig. 2 and Fig. 3. In this embodiment, a laser diode is used as a monochromatic light source LD ₁ ... LD _n , and a photomultiplier tube is used as a photosensitive device PD ₁ ... PD _n as Example to illustrate.

Each laser diode LD _ij in a group of monochromatic light sources 1 is respectively driven by triangular waves with different frequencies and a ratio of 2 times, and each photomultiplier tube PD _ij in a group of photosensitive devices 3 receives the transmission signal transmitted by each laser diode LD _ij The monochromatic light combination I _ij of sample 2; the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each laser diode LD _ij in the monochromatic light combination I _ij , and image the sample 2 accordingly.

Wherein, the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each laser diode LD _ij in the monochromatic light combination I _ij .

In the embodiments of the present invention, unless otherwise specified, the models of the devices are not limited, as long as they can complete the above functions.

Example 6

An imaging optical measuring device with position triangular wave frequency encoding, see Fig. 1, Fig. 2 and Fig. 3. In this embodiment, a monochromatic diode is used as a monochromatic light source LD ₁ ... LD _n , and a photomultiplier tube is used as a photosensitive device PD ₁ ... PD _n Take this as an example.

Each monochromatic diode LD _ij in a group of monochromatic light sources 1 is respectively driven by triangular waves with different frequencies and a ratio of 2 times, and each photomultiplier tube PD _ij in a group of photosensitive devices 3 receives each monochromatic diode LD _ij The monochromatic light combination I _ij transmitted through the sample 2; the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each monochromatic diode LD _ij in the monochromatic light combination I _ij , and based on this, the sample 2 can be imaging.

Wherein, the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each monochromatic diode LD _ij in the monochromatic light combination I _ij .

In the embodiments of the present invention, unless otherwise specified, the models of the devices are not limited, as long as they can complete the above functions.

Example 7

An imaging light measuring device with position triangular wave frequency encoding, see Fig. 1, Fig. 2 and Fig. 3. In this embodiment, the monochromatic light filtered by the monochromatic filter is used as the monochromatic light source LD ₁ ... LD _n , and the photomultiplier tube The photosensitive devices PD ₁ . . . PD _n are taken as an example for description.

Triangular waves with different frequencies and a ratio of 2 times are used to respectively drive each monochromatic filter in a group of monochromatic light sources 1 to filter the white light. Monochromatic light LD _ij , each photomultiplier tube PD _ij in a group of photosensitive devices 3 receives Until each monochromatic light LD _ij passes through the monochromatic light combination I _ij of sample 2; the computer can demodulate and separate the monochromatic light combination I _ij to obtain the contribution of each monochromatic light LD _ij in the monochromatic light combination I _ij , so that sample 2 can be imaged.

Wherein, the computer demodulates and separates the monochromatic light combination I _ij to obtain the contribution of each monochromatic light LD _ij in the monochromatic light combination I _ij .

In the embodiments of the present invention, unless otherwise specified, the models of the devices are not limited, as long as they can complete the above functions.

Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of a preferred embodiment, and the serial numbers of the above-mentioned embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

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.