CN1719206A - Photosensitive measuring method of liquid drop and its device - Google Patents

Abstract

The present invention relates to a light-sensitive measurement method of liquid drop and its equipment. Said equipment includes the following components: liquid tank, throttle pipe, position sensor, light-sensitive sensor formed from sensor light source and photoelectric transducer, converter and signal processing unit. Said invention also provides the concrete steps of its measurement method.

Description

The photoptometer metering method and the device of drop

Technical field

The present invention relates to a kind of photoptometer metering method and device of metering method and device, particularly a kind of drop of drop.

Background technology

The metering of existing drop has two kinds substantially.The metering of a kind of photoelectrometer numerical expression, though simple, because it only measures the drop number and do not measure droplet size, so precision and stability are all relatively poor; The 2nd, the condenser type metering (number of patent application 200410016262.3) of drop, it adopts the capacitance detecting droplet size, and detection can be subjected to the influence of drop dielectric coefficient.

Summary of the invention

The object of the present invention is to provide a kind of photosensitive liquid droplet counting method and device, it adopts throttle style to make liquid transition is the vertical drop drop, utilize drop to change the signal magnitude of the photosensitive receptacle of light sensor and the characteristics that the drop gap falls, with the light sensor detection photosensitive receptacle signal relative changing value under drop and two kinds of situations of dripless is arranged, realize accurate measurement each droplet size.

For achieving the above object, the present invention by the following technical solutions:

A kind of photoptometer metering method and device of drop, adopt the liquid of flow container behind choker-line, to form dripping drops (3), it is characterized in that making then the drop vertical drop successively through a position transducer and a light sensor of forming by sensor light source and photoelectric transformer, measure the time that begins to detect drop by position transducer, measure fall photosensitive changing value in the journey of drop by light sensor, obtain its conversion value through a converter, with a signal processing unit respectively to having passed through time period of light sensor and drop and leave the converter output valve of two time periods of the time period behind the light sensor and carry out integration from beginning to detect drop to drop, and calculate the relative changing value of two integrated values, thereby draw the volume of current drop.

Said method is as follows to the testing step of each drop:

A. the drop vertical drop changes the signal value C of the photoelectric transformer of light sensor through the plate regions in the light sensor, and converter is converted to the acceptable signal B of signal processing unit with signal value C;

B. position transducer is installed in above the light sensor as detecting the start time that drop enters light sensor, position transducer output signal A alert signal processing unit when T0 has detected drop begins a drop is measured, signal processing unit begins the output valve B of converter is carried out integral and calculating, and the integral and calculating value X0 that the time T 1 after drop leaves light sensor obtains is calculated as follows:

$X0=\underset{T0}{\overset{T1}{\∫}}\mathrm{Bdt}$

Get in the formula $T1\≥\sqrt{2\·L1/g}-\sqrt{2\·L0/g},$ Wherein L0 is the distance that choker-line exports to position transducer, and L1 is the distance that choker-line exports to the sonac outlet, and g is the gravity acceleration factor;

C. signal processing unit begins the output valve of converter is carried out integral and calculating from T1 again, and a time T 2 behind T1 obtains integral and calculating value X1:

$X1=\underset{T1}{\overset{T2}{\∫}}\mathrm{Bdt}$

The value of T2 in the formula is as long as assurance X1 integral and calculating precision and X0 integral and calculating precision are basic identical;

Calculate the relative changing value x of X0 and X1:

$x=\frac{a\·X1-X0}{a\·X1},$ Wherein $a=\frac{T2-T1}{T1-T0};$

Drop relative changing value x is directly corresponding with droplet size Q:

$Q=\underset{n=0}{\overset{3}{\mathrm{\Σ}}}{c}_n{x}^n$

Coefficient C ₀, C ₁, C ₂, C ₃Draw by experiment.

A kind of photosensitive measuring apparatus that is used for the drop of said method, comprise that a flow container bottom connects a choker-line, it is characterized in that aiming at the below of described choker-line, set gradually a position transducer and a light sensor of forming by sensor light source and photoelectric transformer, the output of described position transducer directly connects a signal processing unit, and the output of described light sensor also connects described signal processing unit through a converter.

The present invention compared with prior art has following outstanding substantive distinguishing features and remarkable advantage: because the present invention carries out volume metering with the method for light sensor to drop, so signal is big, precision is high.

Description of drawings

Accompanying drawing is the structural principle block diagram of one embodiment of the present of invention.

Embodiment

A preferred embodiment of the present invention such as following: the rainfall measuring apparatus of present embodiment, comprise that flow container 1 lower end connects a choker-line 2 backs and forms dripping drops 3, it is characterized in that in the vertical lower of aiming at choker-line 2, settle a position transducer 4 and a light sensor 5 of forming by sensor light source 5.1 and photoelectric transformer 5.2 successively, the delivery outlet of position transducer 4 directly connects the input port of a signal processing unit 7, and the delivery outlet of light sensor 5 connects signal processing unit through a converter 6.

The present invention is as follows to the testing step of each drop 3:

A. drop 3 vertical drops change the light-to-current inversion end 5.2 signal value C of light sensor 5 through the plate regions in the light sensor 5, and converter 6 just signal value C is converted to signal processing unit 7 acceptable signal B;

B. adopt the position transducer 4 of photoelectricity form to be installed in above the light sensor 5 as detecting the start time that drop 3 enters light sensor 5, position transducer 4 output signal A alert signal processing unit 7 when T0 has detected drop 3 begins a drop 3 is measured, signal processing unit 7 begins the output valve B of converter 6 is carried out integral and calculating, and the time T 1 after drop 3 leaves light sensor 5 obtains integral and calculating value X0:

$X0=\underset{T0}{\overset{T1}{\∫}}\mathrm{Bdt}$

Get in the formula $T1\≥\sqrt{2\·L1/g}-\sqrt{2\·L0/g},$ Wherein L0 is the distance that choker-line 2 exports to position transducer 4, and L1 is the distance that choker-line 2 exports to sonac 5 outlets, and g is the gravity acceleration factor;

C. signal processing unit 7 begins the output valve of converter 6 is carried out integral and calculating from T1 again, and a time T 2 behind T1 obtains integral and calculating value X1:

$X1=\underset{T1}{\overset{T2}{\∫}}\mathrm{Bdt}$

The value of T2 in the formula is as long as assurance X1 integral and calculating precision and X0 integral and calculating precision are basic identical;

Calculate the relative changing value x of X0 and X1:

$x=\frac{a\·X1-X0}{a\·X1},$ Wherein $a=\frac{T2-T1}{T1-T0};$

Drop relative changing value x is directly corresponding with droplet size Q:

$Q=\underset{n=0}{\overset{3}{\mathrm{\Σ}}}{c}_n{x}^n$

Coefficient C ₀, C ₁, C ₂, C ₃Draw by experiment.

Claims (3)

1. the photoptometer metering method and the device of a drop, adopt the liquid of flow container (1) behind choker-line (2), to form dripping drops (3), it is characterized in that making then drop (3) vertical drop successively through a position transducer (4) and a light sensor (5) of forming by sensor light source (5.1) and photoelectric transformer (5.2), measure the time that begins to detect drop (3) by position transducer (4), measure fall photosensitive changing value in the journey of drop (3) by light sensor (5), obtain its conversion value through a converter (6), with a signal processing unit (7) respectively to having passed through time period of light sensor (5) and drop (3) and leave converter (6) output valve of two time periods of the time period behind the light sensor (5) and carry out integration from beginning to detect drop (3) to drop (3), and calculate the relative changing value of two integrated values, thereby draw the volume of current drop (3).

2. the photoptometer metering method and the device of a kind of drop according to claim 1 is characterized in that the testing step of drop (3) as follows:

A. drop (3) vertical drop changes the signal value C of the photoelectric transformer (5.2) of light sensor (5) through the plate regions in the light sensor (5), and converter (6) is converted to the acceptable signal B of signal processing unit (7) with signal value C;

B. position transducer (4) is installed in above the light sensor (5) as detecting the start time that drop (3) enters light sensor (5), output signal A alert signal processing unit (7) began a drop (3) is measured when position transducer (4) had detected drop (3) at T0, signal processing unit (7) begins the output valve B of converter (6) is carried out integral and calculating, and the integral and calculating value X0 that the time T 1 after drop (3) leaves light sensor (5) obtains is calculated as follows:

$X0=\underset{T0}{\overset{T1}{\∫}}\mathrm{Bdt}$

Get in the formula $T1\≥\sqrt{2\·L1/g}-\sqrt{2\·L0/g},$ Wherein L0 is the distance that choker-line (2) exports to position transducer (4), and L1 is the distance that choker-line (2) exports to sonac (5) outlet, and g is the gravity acceleration factor;

C. signal processing unit (7) begins the output valve of converter (6) is carried out integral and calculating from T1 again, and a time T 2 behind T1 obtains integral and calculating value X1:

$X1=\underset{T1}{\overset{T2}{\∫}}\mathrm{Bdt}$

The value of T2 in the formula is as long as assurance X1 integral and calculating precision and X0 integral and calculating precision are basic identical;

Calculate the relative changing value x of X0 and X1:

$x=\frac{a\·X1-X0}{a\·X1},$ Wherein $a=\frac{T2-T1}{T1-T0};$

Drop relative changing value x is directly corresponding with droplet size Q:

$Q=\underset{n=0}{\overset{3}{\mathrm{\Σ}}}{c}_n{x}^n$

Coefficient C ₀, C ₁, C ₂, C ₃Draw by experiment.

3. device that is used for the photoptometer metering method of the described drop of claim 1, comprise that a flow container (1) bottom connects a choker-line (2), it is characterized in that aiming at the below of described choker-line (2), set gradually a position transducer (4) and a light sensor (5) of forming by sensor light source (5.1) and photoelectric transformer (5.2), the output of described position transducer (4) directly connects a signal processing unit (7), and the output of described light sensor (5) also connects described signal processing unit (7) through a converter (6).