JPS5979843A - Apparatus for emission spectral analysis - Google Patents

Abstract

PURPOSE:To achieve the reduction of working load and the enhancement of analytical efficiency, by a method wherein the table of the measuring sensitivity of each element is stored at every kind of a specimen and the kind is indicated by key operation to automatically set proper measuring sensitivity to each element in said kind. CONSTITUTION:Sensitivity setting circuits 1-n corresponding to a first- an n-th elements are respectively equipped with resistances connected in series, a short- circuiting switches S11-S16 and switch control circuits and change over high voltage applied to a photoelectric multiplier Pi to set the measuring sensitivity thereof. When the desired key among the specimen kind indication keys A-X of an operation table T is pressed, CPU successively reads the measuring sensitivity of each element with respect to the kind thereof from memory to outputs the same to a data bus BUS and the sensitivity data of the corresponding element is read in the latch circuits K of the circuit 1-n. By this method, the opening the closing of each switch S11-S16 in each circuit 1-n is set and the measuring sensitivity of each element is set corresponding to the specimen kind indicated by an operator.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical emission spectrometer in which the measurement sensitivity of each element can be changed depending on the type of analysis target.

When trying to measure the concentration of an element in various samples, the content of that element varies greatly depending on the type of sample, and in the case of luminescence analysis, if the measurement sensitivity for the element is held constant, the content of that element will vary depending on the type of sample. This occurs when the sample has excessive sensitivity and the measured value overscales. Conventionally, an analyzer manually sets the measurement sensitivity of each element to a value appropriate for each type of sample, depending on the type of sample. This is fine when the number of analysis targets is small or when the types of analysis targets are not changed frequently, but if there are many analysis targets and there are many types, the burden on the person conducting the analysis increases considerably. become.

The present invention aims to provide an optical emission spectrometer in which, when the type of sample is specified, an appropriate measurement sensitivity is automatically set for each element in that type.

The optical emission spectrometer of the present invention stores a table of measurement sensitivity of each element for each sample type in advance in memory, and when the operator operates a key to specify the sample type, each element is selected from the memory for the sample of the specified type. It is characterized in that the measurement sensitivity of is set.

According to the present invention, the person performing the analysis work simply specifies the type of sample, and the burden on each individual type is reduced.
Mistakes in sensitivity selection are eliminated and analysis efficiency is improved.

The present invention will be explained below with reference to Examples. The figure shows the configuration of an apparatus according to an embodiment of the present invention. In the figure, blocks 1 to n are the first to
This is a sensitivity setting circuit corresponding to the n-th element, and consists of resistors connected in series, shorting switches 811 to Sn6 provided in parallel for each resistor, and a circuit for controlling these switches. One end of the row is connected to the high-voltage power supply for the detector, and the other end of each resistor row is connected to a photomultiplier tube PI-Pn.
and a resistor RO are connected in parallel. In one block, for example 1, the total resistance of the resistor string changes by opening and closing the switches S11 to S'16, and the high voltage applied to the photomultiplier tube P1 is switched by changing the ratio with the resistance Ro. Then, the sensitivity of Pl is determined to be a value, and the measurement sensitivity of the first element is set. Other blocks 2, 3...
(not shown)...The same applies to n. Assuming that the resistance value of the leftmost resistor array in each block 1 to n is R, the resistance values are 2R, 4R, ...25-32R in order to the right, and the 1st to 6th digits of the hexadecimal number are 2R, 4R, ...25-32R. , and if the binary number 1 is the switch on and O is the switch on, the resistance value is obtained. DR is switch 8
11-, the driver circuit that operates Etn6, K is a data latch circuit, to which a binary data signal is applied from the CPU via the interface E, the data is read and latched by the strobe signal, and output to the driver circuit DR. do.

Data shown in the table below is stored in the memories of C and PU.

The data in this table shows the measurement sensitivity for each element 1 to n for each sample type, and the measurement sensitivity for elements l to n of the sample of type A is al, a2, . . . an. The operator console T has A and X keys to specify the type of sample, and when the operator sees the type of sample that has arrived and presses the key for that type, the CPU
sequentially reads the measurement sensitivity of each element for that product from the memory and outputs it to the data node BUS, and in parallel, sends a strobe signal to the data latch circuits K of blocks l to n in order to read the sensitivity data of the corresponding element. is read into each latch circuit K. Thus, the opening and closing of the switches S]-1 to Sn6 in each block 1 to n are set, and the measurement sensitivity of each element is set according to the sample type specified by the operator.

In the above-described embodiment, the operator determines the type of sample that has arrived by looking at the label, etc., and specifies the type himself by operating keys. A hand-held stripe code reader may be used to scan the record on the label and input a signal specifying the sample type to the CPU, which prevents the operator from misreading the label entry or erroneous key operation. This will further reduce the operator's workload. Furthermore, by specifying the shape of the sample, the position of label attachment, etc., it is possible to automate the reading of type data and input to the CPU.

[Brief explanation of drawings]

The drawing is a block diagram showing the configuration of an apparatus according to an embodiment of the present invention. 1-n...Measurement sensitivity setting circuit for each element, DR...
・Driver circuit that operates the switch opening/closing, K...
Data latch circuit, engineering F...interface, T.
...Operation console, BUEI...data bus, ■...high-voltage power supply for the detector, P1 to Pn...photomultiplier tubes for each element. Agent Patent Attorney Kosuke Mai

Claims (1)

[Claims] The measurement sensitivity data for each element is stored in memory for each sample type, and the measurement sensitivity data for each element for the specified type is read out from the memory in response to the sample type designation signal. An emission spectrometer characterized in that measurement sensitivity can be set.