JP3415330B2 - Portable spectrometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the transmission of a sample to be measured.
Measure the light quantity and calculate the transmittance or absorbance by calculation.
Spectroscopy measurement devicePerson in chargeIn particular, the power supply capacity is low.
IPortableReduces the change over time in the light intensity of the light source in the device
To accurately measure transmittance, absorbance, etc.・To be able to calculate
didPortableThe present invention relates to a spectroscopic analyzer. [0002] 2. Description of the Related Art Conventionally, the amount of transmitted light of a sample to be measured is measured.
When calculating transmittance, absorbance, etc.
After measuring the amount of transmitted light and the amount of reflected light,
Measures the amount of excess or reflected light and reflects
The rate, transmittance, absorbance, etc. were determined by calculation. [0003] In general, this type of spectroscopic analyzer is used.
The light source used is the temperature of the light source
It is clear that the light quantity tends to change with the rise. did
As a result, the light amount of the reference light source has changed,
In addition, test measurements such as manually changing the measurement sample
The reference transmitted light amount, such as a device or a portable measuring device
Measurement time and the amount of transmitted light of the sample to be measured
If there is a large time difference from the time,
The difference between the light amount of the light source at the measurement time
Will happen. In other words, the measurement error due to the light amount difference of the light source
This means that there is a difference. Moreover, the temperature rise rate of the light source
Because lighting varies greatly depending on environmental conditions,
Easily correct by adding certain corrections such as time
Cannot be done. [0004] From the above, conventional relatively large spectroscopy.
In analytical measurement, warming up until the temperature of the light source stabilizes
Lighting after lighting and after warming upIWas
To reduce fluctuations in light intensity by eliminating temperature changes in the light source.
Was taken in such a way. [0005] However, the relatively small size
For a portable spectrometer, the power supply capacity is limited.
LargeMinuteThe light source is lit continuously like an optical analysis measurement device.
How to turn on the light source only during measurement
And for portable use, it is generally used outdoors.
And are susceptible to environmental temperature changes.
There was a problem with accuracy. That is, the light source is turned on only at the time of measurement.
Is relatively high when the measurement frequency is highBut,
When the measurement frequency is low, the light source temperature is relatively low.
The temperature difference appears as the light amount difference of the light source as it is,
To,The difference in the amount of transmitted light, etc.Shadow
AffectI was Temperature change due to light source lighting shown in FIG.
The following describes the conventional technology.
In (A) and (B), when the light source is turned on, the temperature of the light source
The temperature rises and the temperature goes down when it goes out
And always the temperature (T0) related to the ambient temperature of the measuring device
Calm down. However, if you repeat the measurement frequently,
Since the temperature keeps changing by turning on the light source (C), the same
Even if the sample is measured, the initial temperature (T
0) and the measured value at the last temperature (Tp)
Now, the shadow due to the light amount difference of the light source due to the temperature difference (Tp-T0)
There is a difference in measured values due to the influence.But,Because
And increase the measurement interval to settle down to the initial temperature (T0).
If you take it tightly, the work efficiency will be greatly reduced
U. Therefore, in the present invention, a spectroscopic analyzeroflight
Without illuminating the source continuously, and
Spectroscopic measurement with minimal variation in light quantity over time
Minimize the effect of light intensity changes on the light source
Can bePortableTechnology to provide a spectroscopic measurement device
It is a technical task. [0008] [MEANS FOR SOLVING THE PROBLEMS]
The present invention provides a light source including a plurality of light-emitting elements,
A light amount detection device that detects the amount of incident specific wavelength light
The light source and the light amount detection device
The sample to be measured is inserted between
Is measured, and the transmittance of the sample is measured.orIs the absorbanceToMeasurement / calculation
A spectral analysis measurement device having an arithmetic control device,
In the arithmetic and control unit, lighting of the light source for a certain time is performed at a certain interval.
Provide a light source lighting routine that repeats withPower supply
When the light source is turned on, the routine for turning on the light source is executed, and the light source is turned on.
If the sample to be measured is set during execution of the routine,
Stop the light source lighting routine and start spectroscopic measurement.
When the setting is completed, return to the light source lighting routine.
Control, Took the technical measures of.[0009] [0010] [Function] In the routine for turning on the light source, at a certain time at certain intervals
By repeatedly turning on the light source during the
Can maintain its temperature above a certain level
You. The light source temperature rises as the frequency of use of the measuring device increases
The difference between the light source temperature when the light source is not turned on and the light source temperature.
Although this may occur, a light source lighting routine is provided as in the present invention.
By turning on the light, the light source lights up periodically,
Raised temperatureLetAlso, this temperature rise will light up the light source
The light source temperature by adjusting the interval
To. Therefore, until now, only turn on during measurement.
Measurement and measurement of the sample to be measured as if
Due to the time difference between the
Compared to the temperature difference of the generated light source,
By turning it on and raising it to a certain temperature
The temperature difference during the measurement was very small. The lighting interval is increased by one lighting.
The temperature of the raised light source returns to the temperature before lighting, for example, the outside temperature.
It is necessary to turn on the light source at intervals
The lighting time is also the minimum required to contribute to the temperature rise of the light source.
Light for a minimum amount of time.
Keep the source temperature as close as possible to the
I can keep it. If you do this,
That fluctuations in light quantity can be minimized compared to
It is important to minimize fluctuations in the amount of transmitted light to be measured.
As a result, measurement accuracy can be improved. Further, the power is turned on by the arithmetic and control unit.
Light source lit routineRun,TheRun the light source lighting routine
When the sample to be measured is set, the light source is turned on.
Stop and perform spectroscopic measurement,TheWhen measurement is completedPrevious
RecordBy returning to the light source lighting routine,
The measurement operator is completely conscious of this light source lighting routine.
The spectrometer without the needJust need.[0013] [0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a preferred embodiment of the present invention, a method is described in which a leaf near a plant is used.
Irradiation of infrared light and its absorbanceAnd saidCalculated from the absorbance
Portable spectrometer that measures and computes nitrogen and other components
The measuring device will be described with reference to FIGS. Figure
1 shows a main part of a portable spectroscopic analyzer 1
It is a side sectional view of a minute. In FIG. 1, the light source 1 is provided in the lower body 7.
0 as well as a light amount detection device 11
The configuration is such that a photodiode 9 is provided. light source
Reference numeral 10 denotes a plurality of light sources having different wavelength peaks on the same circumference.
LED2 which is an optical element is arranged, and
Narrow bandpass filters 3 having different wavelength bands are provided.
You. The wavelength band is from 600 nm to 1100 nm.
From the band, a narrow band of any specific wavelength related to the desired component
The bandpass filter-3 has been selected. Each LED2 emits light
The light is turned into light of a specific wavelength by the narrow band filter-3.
Then, the light enters the scattering plate 4 through which light is transmitted. This scattering plate 4
Within the plate thickness, light is diffused and loses directivity. Scattering plate
The light that has lost its directivity from 4 is diffused inside.
Light is incident on the condensing block 5 formed on a certain conical scattering wall.
In the light collecting block 5, the light collecting block 5 and the scattering plate
Transparent while reflecting and diffusing the space surrounded by 4
So that it is incident on the light amount detection device 11 from the glass plate 6
is there. The light amount detection device 11 is arranged at an arbitrary distance from the light source 10.
More specifically, the light source 10 is provided between the glass 6 and the light source 10.
At a certain interval, the leaves 19 to be the measurement sample can be inserted.
It is set up. An upper lid 12 is provided on the outer periphery of the upper part of the light quantity detecting device 11.
Arm 16 extending from the upper lid 12
It is pivoted. Further, the upper lid 12 is loosely fitted to the main body 7.
With the push button 15 that pushes down the arm 16
And a coil spring 1 which is urged in a direction opposite to that of the push button 15.
7 is provided. In addition, the push button
Push down the push button 15 on the body 7 facing
A switch 18 is provided to detect that Next, with reference to FIG.
The block diagram of FIG. Light source 10WhenLight intensity detector
The sample leaf to be measured detected by the measuring unit 8 comprising 11
The amount of transmitted light at 19 is analogized by the photodiode 9.
Is converted into electrical signals,Connected to analog board 20
It is. The light source 10 is provided with a light emitting device 29 of LED2.
You. In analog board 20,Analog to digital signals
A / D conversion to signal or from voltage to frequency
V / F conversion is performed. The converted signal is an I / O board
CPU board including the operation of the arithmetic and control unit via 21
22. From the analog board 20 to the light emitting device 2
The light emission signal of the LED 2 is output to 9. The I / O box
The measurement result, the calculation result or the operation instruction is displayed on the display 21.
LCD display LCD23, input and operation of initial data
Keyboard 24 for inputting and outputting data to and from external devices.
Provide RS232C connection port 25, switch 8, etc.
It is. These CPU board 22 and I / O board 21
Are connected to supply power from the power supply board 26.
You. The printer 28 has a printer I / F board 27.
It is connected to the CPU board 22 through the CPU board. The spectroscopic analyzer 1 thus constructed
Then, the light source 10 and the amount of incident specific wavelength light are detected.
A single light amount detection device 11 is opposed at an arbitrary interval.
Between the light source 10 and the light amount detection device 11.
Insert the leaf 19leafMeasures 19 transmitted light
And the transmittance or absorbance of the sample to be measured
The calculation is performed by the board 22. CPU board 2
The operation of transmitted light quantity measurement control in 2 is an arithmetic control unit.
This will be described below. According to the present invention, the arithmetic and control unit includes a light source.
Set a light source lighting routine that repeats lighting at regular intervals for a fixed time.
There is. In addition, the light source lighting
-The light source is turned on when the power is turned on.Run,The
The sample to be measured is set during execution of the light source lighting routine.
Stops the routine that turns on the light source and shifts to spectroscopic measurement
When the measurement is completed, return to the light source lighting routine.
It is. An example of the spectroscopic analysis according to the present invention will be described in the following order.
I will explain. Transmitted light amount value and light source of sample 19 to be measured
10 and measure the direct light intensity value, calculate the transmittance,
Firing rateorIs the absorbanceToIs what you want. Spectroscopic analyzer
After turning on the power of 1, the operator pushes down the push button 15operationBy
The measurement operation is started. thisWhenFirst criteria
Insert the sample and measure the data obtained from the reference sample.
-Initial setting by data for more accurate measurement
Is an effective means of After the power of the spectroscopic analyzer 1 is turned on, the arithmetic
Control equipment,A fixed period of the light source 10 by the light source lighting routine
Start blinking every other interval. After that, the light quantity detection
Push the top cover 12 to block the ejection device 11
Press to open,The sample leaf 19 to be measured is inserted and closed.
Then, the sample leaf 19 to be measured is
The insertion is sensed by the switch 18 and the light source point is detected.
The lamp routine is stopped, and the transmitted light amount of the sample 19 to be measured is
Start measurement. The measurement of the sample leaf 19 to be measured is completed.
Is measured by the operator using signals from the LCD 23
The operator is notified of the measurement of the amount of transmitted light of the sample leaf 19, and the operator
After confirming this signal, the sample leaf 19 to be measured is removed.
You. Pressed down when removing the sample leaf 19 to be measured
Switch 18 senses the push button 15
The device again blinks the light source 10 by the light source lighting routine.
To start. Next, the light source lighting−Diagram of the action of chin
3 will be described. The light source 10 shown in FIG.
Of multiple light source elements (LEDs)
Is what it is. Light source 10 is constant as shown in FIG.
The light source 10 is turned on at intervals ti, for example, at intervals of one minute.
Is 0.5 seconds, for example. like this
By executing the light source lighting routine that repeats flashing
Therefore, as shown in FIG. 3B, the temperature of the light source is the environmental temperature (T
0) without descending to,Measurement frequency increases
Light source temperature is high (Tp)WhatEven when not measuring
Of the light source temperature (Tm). like this
To,Influence of light intensity fluctuation by light source temperature before and after measurement
Implement a light source lighting routine to light the light source
Can be avoided by: The arithmetic and control unit operates the push button 15 to
If the operation is detected by the switch 18, the measured
A push that always acts when taking in and out the fixed sample leaf 19
The operation of the push button 15 is controlled by the arithmetic and control
Control the light source lighting routine with the arithmetic and control unit.
it can. Therefore, it should not be added to the operator's work process.
Can be switched naturally,Obstruct measurement work
Stable light intensityRealization ofAnd accurate measurementWhen
The portable type with small power capacityofWith a spectrometerAlsoReal
Now you can. [0024] According to the present invention, the light source of the spectroscopic analyzer is turned on by a light source.
To reduce power consumption and blink efficiently
Portable spectrometer with a small power supply capacity.
In placeAlsoIt becomes applicable and stabilizes the light intensity of the light source.,Measured
Stabilizes the amount of transmitted light, etc.
Could be improved. Also,,Spectroscopic measurement and light
Since the source lighting routine is switched,
For regular workers, it is necessary to reduce the amount of light source fluctuation.
It is not necessary to measure the sample to be measured.
Obtaining more accurate measurement results with the same content
Is now available.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a spectroscopic analyzer of the present invention. FIG. 2 is a control block diagram of the spectroscopic analyzer. FIG. 3 is a diagram showing a temperature change of a light source according to the present invention. FIG. 4 is a diagram showing a change in temperature of a light source when measurement is performed in the related art. [Explanation of Signs] 1 Spectroscopic analysis measuring device 2 LED 3 Narrow band filter 4 Scattering plate 5 Light collecting block 6 Transparent glass plate 7 Main body 8 Measurement unit 9 Photodiode 10 Light source 11 Light amount detecting device 12 Top cover 13 Support point 15 Push Button 16 Arm 17 Coil spring 18 Switch 19 Sample leaf 20 to be measured Analog board 21 I / O board 22 CPU board 23 LCD (liquid crystal display) 24 Key board 25 Connection port 26 Power supply board Board 27 I / F board 28 Printer 29 Light emitting device

Claims (1)

(57) [Claim 1] A light source comprising a plurality of light emitting elements and a light amount detecting device for detecting a light amount of a specific wavelength incident from the light source are opposed to each other at an arbitrary interval, and the light source is Insert the sample to be measured between the light amount detection device and measure the transmitted light amount of the sample, and measure the transmittance or absorbance of the sample.
A spectroscopic measurement apparatus having an arithmetic control unit for calculating, on the arithmetic and control unit, a light source lighting repeated lighting of a certain time of the light source at regular intervals Le - the provided Chin Rutotomoni, electrostatic
A light source lighting routine is executed by turning on the light source, and the light source
The sample to be measured is set during execution of the lighting routine
And stop the light source lighting routine to start spectroscopic measurement.
When the measurement is completed, the routine returns to the light source lighting routine.
A portable spectroscopic analysis and measurement device, characterized in that it is controlled so as to cause the measurement.