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correlator

A correlator and counter technology, applied in the field of correlators, can solve problems such as increased bias noise, decreased accuracy, and baseline wobble

Active Publication Date: 2012-02-15
HORIBA LTD
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  • Claims
  • Application Information

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Problems solved by technology

But in fact, once the sampling time becomes larger, the number of data points for smaller particles is insufficient, and the accuracy is reduced.
[0007] In addition, the multi-strand method, as shown in Patent Document 1, is the following method. By grouping all the traces, the traces within the group are linearly sampled, and the traces between the groups are exponentially sampled, thereby overcoming the shortcomings of the above two methods and absorbing the two The advantage of the former method, but there is a problem that the baseline fluctuation (variation) in the trace of the rear group with a long interval, that is, the so-called offset noise will increase, and the accuracy of the autocorrelation function will decrease.

Method used

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no. 1 approach

[0026] Next, a first embodiment of a particle size distribution measuring device using the correlator of the present invention will be described with reference to the drawings.

[0027] in addition, figure 1 It is a schematic configuration diagram of the particle size distribution measuring device 1 of the present embodiment, figure 2 , image 3 It is a hardware configuration diagram showing the hardware configuration. and Figure 4 It is a timing diagram showing that the gate circuit of the counter 61 is turned on and off.

[0028]

[0029] The particle size distribution measuring device 1 of the present embodiment is as figure 1 Shown includes: a transparent unit chamber 2 containing a sample formed by the diffusion of particle groups in a dispersant such as water; a bathroom 3 in which the unit chamber 2 is impregnated with a liquid; The light irradiation unit 4 that irradiates the sample with L; the photosensitive unit 5 that receives the scattered light S emitted ...

no. 2 approach

[0054] Next, a second embodiment of the particle size distribution measuring device using the correlator of the present invention will be described.

[0055] The particle size distribution measuring device of the present embodiment differs from the first embodiment in the delay time of the delay unit 63 in the correlator. The control unit 65 of this embodiment sets the delay time T of the delay unit 63 based on a recursive formula between three terms other than the Fibonacci sequence. n .

[0056] That is, the control unit 65 determines the delay time according to the following formula.

[0057] T n =f n ×T o ,

[0058] f n =f n-1 +f n-3 (f n is a natural number)

[0059] At this time,

[0060] f n =f n-1 +f n-3

[0061] =f n-1 +(1 / r)f n-2

[0062] =f n-1 +(1 / r 2 ) f n-1

[0063] =(1+1 / r 2 ) f n-1

[0064] Therefore, the element f of the geometric sequence of the common ratio r n-1 , f n-3 The sequence formed by addition, take r in r 2 (r—1)—the pos...

no. 3 approach

[0067] Next, a third embodiment of the particle size distribution measuring device using the correlator of the present invention will be described.

[0068] The particle size distribution measuring device of the present embodiment differs from the first embodiment in the delay time of the delay unit 63 in the correlator. The control part 65 of this embodiment sets the delay time T of the delay part 63 according to the recursive formula between four items n .

[0069] That is, the control unit 65 determines the delay time T as follows: n .

[0070] T n =f n ×T o ,

[0071] f n =f n-1 +f n-5 +f n-6 (f n is a natural number)

[0072] In this way, the common ratio r can converge to 1.42, and realize the common ratio r=2 in a gradual manner 1 / 2 . Specifically, the sequence {1, 1, 1, 1, 1, 1, 3, 5, 7, 9, 11, 15, 23, 35, 51, 71, 97, 135, 193, 279, 401, 569, 801, 1129, ...}. It is also possible to set the calculation result as it is as the sampling time, and use the ca...

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Abstract

In order to improve an accuracy of an autocorrelation function, a correlator comprises a counter 61 for receiving a pulse signal at given time intervals (sampling times) and counting the number of pulses; a shift register 63 for receiving the number of pulses counted by the counter 61 and performing sequential time delay; an operation part 64 for performing a product-sum operation of an output from the counter 61 and that delayed by the shift register 63 for each channel; and a control part 65 for setting a delay time or a sampling time by the shift register 63 on a basis of a relationship of the Fibonacci sequence.

Description

technical field [0001] The present invention relates to a sampling method of a correlator system used, for example, in a photon correlation type particle size distribution measurement device. Background technique [0002] Photon-correlation particle size distribution measurement, according to the specified sampling time, counts the number of photons (pulse signals) corresponding to the intensity of scattered light produced by the particles to be measured, and performs time delay by the shift register, and performs product and sum operations to obtain From the autocorrelation function, the particle size (particle diameter) is calculated using the relaxation coefficient thereof. [0003] As for the sampling method, linear sampling method, exponential sampling method, multi-strand method and the like are known. [0004] However, these methods have the following problems. [0005] The autocorrelation function obtained by the photon correlation method is an ordinary exponential...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02G01J1/44G01B11/08
CPCG01N15/0205G01N2015/0222G06F17/15
Inventor 山口哲司河原林成行
Owner HORIBA LTD
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