Zero calibration device and calibration method for transmission-type measuring instrument with container

Abstract

The invention discloses a zero calibration device and calibration method for a transmission-type measuring instrument with a container. A transmission-type measuring instrument is composed of a signal transmitting unit, a signal receiving unit and a signal processing unit. When in use, the signal transmitting unit and the signal receiving unit are respectively placed on two sides of a measured object. A signal transmitted by the signal transmitting unit passes through a measured object and is received by the signal receiving unit. And the signal processing unit processes and obtains certain or certain attribute information of the measured object according to the change of certain or certain attributes of the signal. When the shape of an object to be measured, such as gas, liquid and powder, is difficult to fix, a container is often required to be used for containing the object to be measured, and then the container and the object to be measured are integrally measured. Because the presence of a container affects a measurement signal, zero calibration needs to be performed on an empty container. However, in practical application, the situation that zero point signals of empty containers are difficult to directly read and zero point calibration cannot be directly carried out occurs, and the measurement accuracy is affected. The method solves the problem that when a transmission-type measuring instrument uses a container, the zero point of the empty container is difficult to directly calibrate. The method has important significance in improving the measurement accuracy of a transmission-type measuring instrument and reducing the influence of a container on a measurement result.

Description

Technical Field

[0001] The present invention relates to transmission type measurement, in particular to zero point calibration when a container is used in transmission type measurement. Background Art

[0002] Transmission measuring instruments are a widely used type of measuring equipment. They typically consist of a signal transmitter, a signal receiver, and a signal processing unit. During use, the transmitter and receiver are placed on either side of the object being measured. The transmitter emits a signal that can penetrate the object, either artificially or naturally. This signal is typically a penetrating wave or stream of matter, with common examples including X-rays, gamma rays, microwaves, lasers, ultrasound, and neutron beams. Figure 1 The basic structure diagram of this instrument is given: A signal transmitting unit (1), configured to transmit a signal that can penetrate the object being measured; A signal receiving unit (2) is used to receive a signal sent from the signal transmitting unit; A signal processing unit (3) is used to process the received signal and convert the signal into a measurement result; A signal area (4) is an area covered by the signal emitted by the signal emitting unit (1), wherein placing an object in the area may affect the signal emitted from the signal emitting unit (1) and affect the signal reading received by the signal receiving unit (2); When in use, it is generally necessary to first make sure that there is no object in the signal area. The signal receiving unit first collects the signal received when there is no object to be measured. The signal processing unit processes the signal to form the "zero point" data U0 of the measuring instrument. The basic structure of the measuring instrument when collecting "zero point" data can be seen in Figure 1 After that, the object under test enters the signal area, and the signal receiving unit receives the signal passing through the object under test and forms the measurement data U t The signal processing unit analyzes the changes in properties between the signal data and the "zero point" signal data, using a mathematical model: Process the data to obtain some or certain attribute information W of the object being measured t , this information can be output as a measurement result. Figure 2 The basic structure diagram of the instrument during measurement is given below: A signal transmitting unit (1), configured to transmit a signal that can penetrate the object being measured; A signal receiving unit (2) is used to receive a signal sent from the signal transmitting unit; A signal processing unit (3) is used to process the received signal and convert the signal into a measurement result; A signal area (4) is an area covered by the signal emitted by the signal emitting unit (1), wherein placing an object in the area may affect the signal emitted from the signal emitting unit (1) and affect the signal reading received by the signal receiving unit (2); The object to be measured (5), is placed between the signal transmitting unit and the signal receiving unit.

[0003] In actual applications, if the object to be measured is a gas, liquid, powder or other object that cannot be formed, a container is required to hold the object to be measured. In some special cases, formed solids may also need to be loaded in a container. The container and the object to be measured are then placed as a whole in the signal area for measurement. Figure 3 The basic structural diagram with container and object to be measured is given: A signal transmitting unit (1), configured to transmit a signal that can penetrate the object being measured; A signal receiving unit (2) is used to receive a signal sent from the signal transmitting unit; A signal processing unit (3) is used to process the received signal and convert the signal into a measurement result; A signal area (4) is an area covered by the signal emitted by the signal emitting unit (1), wherein placing an object in the area may affect the signal emitted from the signal emitting unit (1) and affect the signal reading received by the signal receiving unit (2); The object to be measured (6) is placed in a container and placed in the signal area together with the container; The container (7) is used to hold the object to be measured.

[0004] When there is a container, the container will affect the signal emitted by the signal transmitting unit, and then affect the signal received by the signal receiving unit. Therefore, the influence of the container needs to be removed to improve the measurement accuracy. The method to remove the influence of the container is to put an empty container into the signal area and collect the data U of the signal receiving unit at this time. c , with U c For the new "zero point", a zero point calibration (also called zero point calibration) is performed on an empty container, and then through a mathematical model: Process the data to obtain some or certain attribute information W of the object being measured t . Figure 4 The following is a schematic diagram of the structure when using an empty container for zero point calibration: A signal transmitting unit (1), configured to transmit a signal that can penetrate the object being measured; A signal receiving unit (2) is used to receive a signal sent from the signal transmitting unit; A signal processing unit (3) is used to process the received signal and convert the signal into a measurement result; A signal area (4) is an area covered by the signal emitted by the signal emitting unit (1), wherein placing an object in the area may affect the signal emitted from the signal emitting unit (1) and affect the signal reading received by the signal receiving unit (2); The container (7) is used to hold the object to be measured.

[0005] The above is the basic method of zero-point calibration and signal data processing when a transmission measuring instrument is used for container measurement under normal circumstances. In actual application, the signal receiving unit has upper and lower detection limits, that is, when the received signal strength is too low, the detector's response capability is insufficient and it is unable to give a valid reading; and when the strength is too high, the signal receiving unit is "saturated" and also unable to give a valid reading. Therefore, when the object to be measured and the container are placed together in the signal area, in order to ensure that the signal strength received on the signal receiving unit is not too low, it is necessary to increase the strength of the signal transmitted by the signal transmitting unit so that after the signal is affected by the container and the object to be measured, it still has sufficient strength to be received by the signal receiving unit and correctly collected to U t However, at this time, due to the increase in the signal strength of the signal transmitting unit, if the Figure 4 If the structure shown is used to calibrate the empty container to zero, the signal strength received by the signal receiving unit may be too high, causing the signal receiving unit to be "saturated", making it impossible to obtain a valid reading and thus unable to correctly collect U c Similarly, if the empty container is removed and there are no other objects in the detection area, the signal strength received by the signal receiving unit will be higher, and no valid reading can be obtained, and U0 data cannot be correctly collected.

[0006] The inability to obtain "zero point" data—that is, to perform zero point calibration for empty containers—makes transmission-type measuring instruments difficult to meet the measurement requirements described above. While it's possible to approximate the zero point of an empty container by assigning an empirical value as a "hypothetical zero point," this still differs from the actual value, affecting measurement discrimination and accuracy. Therefore, how to calibrate the zero point of transmission-type measuring instruments when using containers, while also adapting to the high signal intensity measurements required, remains a pressing challenge in this field.

[0007] In response to the above problems, the present invention discloses a "zero point calibration device and calibration method for a transmission-type measuring instrument with a container", which is used for zero point calibration of a transmission-type measuring instrument with a container, and at the same time adapts to the measurement needs of high signal intensity, thereby improving the measurement accuracy. Summary of the Invention

[0008] The technical problem solved by the present invention is to provide a zero point calibration device and calibration method for a transmission type measuring instrument with a container, which is used to solve the problem of performing zero point calibration of the transmission type measuring instrument with a container when the signal intensity emitted by the signal transmitting device is large and the zero point data of the empty container cannot be directly read.

[0009] To achieve the above-mentioned object, the present invention provides a zero-point calibration device for a transmission-type measuring instrument with a container, which is characterized in that: Calibration object A is installed; Standard object B is installed; The standard objects A and B are placed between the signal transmitting unit and the signal receiving unit of the measuring instrument, and are located within the signal zone. The signal emitted by the signal transmitting unit passes through the standard objects A and B and is received by the signal receiving unit. The standard objects A and B are objects that can affect the measurement signal of the transmission measuring instrument, thereby changing the reading of the signal receiving unit. They can be solid, liquid or gas contained in a container, liquid or gas injected into the placement location, etc. The standard object can be moved out of the signal area and placed into the placement position by a manual or mechanical driving mechanism; The characteristic of standard object A is that when it is placed alone in the signal area, the signal emitted by the signal transmitting unit penetrates the standard object A and reaches the signal receiving unit. The signal strength is neither too low nor too high, and can adapt to the receiving capacity of the signal receiving unit, so that the signal receiving unit can correctly collect the reading. Let this reading be U A ; The characteristic of standard object B is that when an empty container and standard object B are placed in the signal area at the same time, and there are no other objects in the signal area, the signal emitted by the signal transmitting unit penetrates the empty container and standard object B to reach the signal receiving unit. The signal strength is neither too low nor too high, and can adapt to the receiving capacity of the signal receiving unit, so that the signal receiving unit can correctly collect the reading, and the reading value obtained at this time is equal to the aforementioned U A； When there are no other objects in the signal area, the standard object A is moved into the signal area by a manual or mechanical driving mechanism, and the signal receiving unit reads the signal, which is processed by the signal processing unit to obtain the reading U when the standard object A exists alone. A ; When only standard object A is in the signal area, standard object B is moved into the signal area by a manual or mechanical driving mechanism. The signal receiving unit reads the signal, and the signal processing unit processes it to obtain the reading U when standard objects A and B are present at the same time. AB ; The signal processing unit of the measuring instrument uses the U A 、U ABThe empty container zero point U of the instrument is calculated based on the calibration mathematical model when only an empty container exists. C .

[0010] The signal transmitting unit is an X-ray device, and the signal receiving unit is a crystal scintillation counter or an ionization chamber detector.

[0011] The mechanical drive mechanism is a pneumatic, hydraulic, electromagnetic or motor-driven drive.

[0012] The calibration device is also equipped with a limit device, and the standard object is driven by a manual or mechanical driving mechanism to move or stop according to the limit device.

[0013] To achieve the above object, the present invention further provides a zero point calibration method for a transmission type measuring instrument with a container, which is characterized by comprising: Device initialization step: When there are no other objects in the signal area, the standard object A is moved into the signal area by a manual or mechanical driving mechanism, the signal receiving unit reads the signal, and the signal processing unit processes the signal data U when the standard object A exists alone. A The standard object A is moved out of the signal area by a manual or mechanical driving mechanism, and the empty container and the standard object B are moved into the signal area by a manual or mechanical driving mechanism. The signal receiving unit reads the signal, and the signal processing unit processes the signal data obtained when the empty container and the standard object B coexist. The characteristics of the standard object B, such as material, external dimensions, etc., are adjusted. The above steps of reading the signal data when the empty container and the standard object B coexist and adjusting the characteristics of the standard object B are repeated until the value of the signal data is equal to U A At this time, the standard object B is determined; in the standard object B measurement step, when there are no other objects in the signal area, the standard objects A and B are moved into the signal area by a manual or mechanical driving mechanism, the signal receiving unit reads the signal, and the signal processing unit processes it to obtain the signal data U when the standard objects A and B coexist. AB Data calculation and storage step, the signal processing unit of the measuring instrument uses the signal data U when the standard A exists alone A , signal data U when standard A and standard B coexist AB Calculate the load value W of a certain attribute of standard object B according to the calculation mathematical model B , W B Save for subsequent use; Zero point calibration step, when zero point calibration is required, when there are no other objects in the signal area, the standard object A is moved into the signal area by a manual or mechanical drive mechanism, the signal receiving unit reads the signal, and the signal processing unit processes the signal to obtain the new measurement signal data U when the standard object A exists alone. A新 , calculate the zero point data U of the empty container according to the calibration mathematical modelC .

[0014] The calculation mathematical model is: The basic mathematical relationship for this type of transmission measurement is known (1): , Where W i —The load value of a certain property of the object being measured by this measuring instrument; U0—zero point signal data of measuring instrument; U t — measurement signal data of measuring instruments; Will U A 、U AB Substituting the above relationship into the mathematical relationship (2): , Where W B —Load value of a certain attribute of standard object B; U A —Measurement signal data when standard substance A exists alone; U AB —Measurement signal data when standard substance A and standard substance B coexist.

[0015] The calibration mathematical model is: W B 、U A新 Substituting into mathematical relation (1) we obtain mathematical relation (3): , Where W B —Load value of a certain attribute of standard object B; U A新 —New measurement signal data when standard A exists alone; U C —Empty container zero point data; Where W B It has been measured, calculated and saved through the above steps and is known; U A新 It is obtained by measuring in this step, and the empty container zero point data U can be calculated through mathematical relationship (3) C , which is the zero point value that needs to be obtained in the current zero point calibration step.

[0016] During the device initialization step, the signal data when the standard object A exists alone can also be obtained by the following method: when there are no other objects in the signal area, the standard object A is moved into the signal area by a manual or mechanical driving mechanism, and the signal receiving unit reads the signal. Within the measurement time t1, a plurality of (N1) signal data are read, which are recorded as: , calculate the signal data U when the standard substance A exists alone using the following formula A : .

[0017] During the device initialization step, signal data when the empty container and the standard object B exist alone can also be obtained by the following method: the standard object A is moved out of the signal area by a manual or mechanical drive mechanism, and the empty container and the standard object B are moved into the signal area by a manual or mechanical drive mechanism. The signal receiving unit reads the signal, and a plurality of (N2) signal data are read within the measurement time t2, which is recorded as: Calculate the reading U when the standard B and the empty container coexist using the following formula: BC : .

[0018] In the step of measuring the standard object B, the signal data when the standard objects A and B coexist may also be obtained by the following method: when there are no other objects in the signal area, the standard objects A and B are moved into the signal area by a manual or mechanical driving mechanism, and the signal receiving unit reads the signal. Within the measurement time t3, a plurality of (N3) signal data are read, which are recorded as: Calculate the reading U when standard substance A and standard substance B coexist using the following formula: AB : .

[0019] The beneficial technical effects of the present invention are: By measuring standard A and standard B and calculating using a mathematical model, the problem of zero point calibration of a transmission type measuring instrument with a container for an empty container and adapting to the use requirement of high signal intensity is solved.

[0020] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the basic structure of a typical transmission measuring instrument;

[0022] Figure 2 This is a schematic diagram of the basic structure of a typical transmission measuring instrument when performing measurements;

[0023] Figure 3 This is a schematic diagram of the basic structure of a typical transmission measuring instrument with a container and an object to be measured;

[0024] Figure 4 This is a schematic diagram of the basic structure of a typical transmission measuring instrument when using an empty container for zero point calibration;

[0025] Figure 5 Schematic diagram of the structure when using standard A for reading provided by the present invention;

[0026] Figure 6 Schematic diagram of the structure of the present invention when using an empty container and standard B for reading;

[0027] Figure 7 Schematic diagram of the structure when reading using standard A and standard B provided by the present invention;

[0028] Figure 8 It is a flow chart of the zero point calibration steps provided by the present invention;

[0029] Figure 9 is a flow chart of the device initialization steps in the present invention;

[0030] Figure 10 is a flow chart of the measurement steps of standard B in the present invention;

[0031] Figure 11 It is a schematic diagram of the principle of zero point calibration calculation performed by the present invention;

[0032] Wherein, the reference numerals: 1——Signal transmitting unit; 2——Signal receiving unit; 3——Signal processing unit; 4 – signal area; 5——Measured object; 6——The object to be measured contained in the container; 7 – container; 8——Standard A; 9——Standard B; 10——Limiting mechanism of standard object A; 11——Drive device of standard object A; 12——Limiting mechanism of standard object B; 13 - driving device of standard object B; 14 - Artificial assumptions in Standard A, Part I; 15-Artificial assumptions in standard A Part II. DETAILED DESCRIPTION

[0033] The present invention is further described with reference to the accompanying drawings.

[0034] Figure 7 This is a schematic diagram of the main equipment of the present invention, which includes a signal transmitting unit 1; a signal receiving unit 2; a signal processing unit 3; a standard object A 8; a standard object B 9; a limiting mechanism 10 for standard object A; a driving device 11 for standard object A; a limiting mechanism 12 for standard object B; a driving device 13 for standard object B; the area between the signal transmitting unit 1 and the signal receiving unit 2 is a signal area 4.

[0035] The signal transmitting unit 1 is an X-ray device, and the signal receiving unit 2 is a crystal scintillation detector. The standard objects A8 and B9 are made of aluminum sheets, copper sheets, plastic sheets, or other materials.

[0036] The driving device 11 of standard object A and the driving device 13 of standard object B are motors, electromagnetics, pneumatics, hydraulics or other power-driven drivers. The limiting mechanism 10 of standard object A and the limiting mechanism 12 of standard object B are guide rails, grooves or other mechanical mechanisms that limit the movement range and stop position of standard objects A8 and B9 respectively.

[0037] Standard A8 and standard B9 can be moved into or out of signal region 4 .

[0038] like Figure 8 The figure shows a flow chart of the zero point calibration method of the present invention, which specifically includes the following steps: The device initialization step initializes each device described in the invention; the standard object B measurement step measures the standard object B to obtain the data required for calibration; the data calculation and storage step obtains and saves the data required for zero point calibration through mathematical model calculation; the zero point calibration step performs zero point calibration on the instrument equipment.

[0039] The specific contents of each step are as follows: like Figure 9 FIG. 1 is a flowchart of the method for initializing the aforementioned device of the present invention, which specifically includes the following steps: Read the data U of standard A A When there is no other object in the signal area 4, the standard object A8 is moved into the signal area under the drive of the driver 11 of the standard object A. At this time, the signal emitted by the signal transmitting unit 1 is only affected by the standard object A8. The device structure diagram at this time is as follows Figure 5 As shown, The signal receiving unit 2 receives the signal transmitted by the signal transmitting unit 1 and outputs the signal data. During the measurement time t1, a total of N1 signal data are measured, which are recorded as: Calculate the average value within the time t1, and this average value is the reading U of the standard A8 A : .

[0040] Read the data U of the standard object B and the empty container BC Step 1: Under the drive of the driver 11 of the standard object A, the standard object A8 is moved out of the signal area. Under the drive of the driver 13 of the standard object B, the standard object B9 is moved into the signal area. The empty container 7 is moved into the signal area. The schematic diagram of the device structure is as follows: Figure 6As shown, the signal receiving unit 2 receives the signal transmitted by the signal transmitting unit 1 and outputs signal data. Within the measurement time t2, a total of N2 signal data are measured, which are recorded as: Calculate the average value within time t2, which is the reading U when the standard B9 and the empty container 7 coexist. BC : ; Compare U BC with U A If the two are equal, then the standard B9 meets the requirements, and the standard B9 can be determined, the initialization is completed, and it can be used for subsequent process operations. BC with U A If the values are not equal, you need to adjust the properties of the standard object B9, such as thickness, size, material, etc., and then repeat the above method in this step to read the data and compare the data again. Repeat the above steps of reading data, comparing data, and adjusting the properties of the standard object B9 until the reading U BC with U A If the values are equal, the initialization of standard substance B9 is completed and it can be used for subsequent process operations.

[0041] like Figure 10 FIG. 1 is a flow chart showing the steps for measuring the data of standard object B in the present invention, which specifically includes the following steps: Put the standard objects A and B in place. When there are no other objects in the signal area 4, the standard object A8 is moved into the signal area under the drive of the driver 11 of the standard object A; the standard object B9 is moved into the signal area under the drive of the driver 13 of the standard object B. At this time, the signal emitted by the signal transmitting unit 1 passes through the standard objects A8 and B9 and reaches the signal receiving unit 2. The data when the standard objects A and B coexist is read. The signal receiving unit 2 receives the signal emitted by the signal transmitting unit 1 and outputs the signal data U. k , within the measurement time t3, a total of N3 signal data are measured, recorded as: Calculate the average value within t3, which is the reading U when standard A8 and standard B9 coexist. AB : .

[0042] After completing the measurement steps for Standard B, proceed to the data calculation and saving steps: The reading U when the standard substance A8 exists alone has been obtained by the above steps. A , the reading when standard A8 and standard B9 coexist is U AB , with U A As the "zero point", substitute the value into the following mathematical model: , the load value W of a certain property of the standard object B9 can be calculated B，Save the load value for later use.

[0043] After completing the above steps, you can proceed to the zero point calibration step.

[0044] Specific content and principles of zero point calibration steps: like Figure 4 As shown, when there is only an empty container 7 in the signal area 4, the signal emitted by the signal transmitting unit 1, after passing through the empty container 7, is too strong when it reaches the signal receiving unit 2, exceeding the upper limit of the receiving capacity of the signal receiving unit 2. The signal receiving unit 2 is saturated, and no valid reading can be obtained. Figure 5 As shown, according to the method proposed by the present invention, when there is only the standard object A8 in the signal area 4, the signal emitted by the signal transmitting unit 1, after passing through the standard object A8, reaches the signal receiving unit 2 with an appropriate intensity, so that the signal receiving unit 2 can normally obtain the signal and obtain a correct reading U A Then we know that the load W of a certain property of standard object A8 is A Higher than the load of this attribute of empty container 7, assuming that the load value of this attribute of empty container 7 is W C , then: ;like Figure 11 As shown, standard object A8 can be considered as consisting of two parts (standard object A8 remains a single entity and is not actually separated into two parts): part 14 and part 2 15. And the load of a certain attribute of one of them is equal to the load of that attribute of the empty container 7. Assuming it is part 14, then: ......(a) ......(b) From (a) and (b) we can get: ......(c) In formulas (a), (b), and (c): W A —The load value of a certain attribute of the standard object A as a whole; W1—the load value of a certain attribute in the first part of the artificially assumed standard object A; W2—the loading value of a certain attribute in the second part of the artificially assumed standard object A; W C —Load value of a certain attribute of an empty container; In the device initialization step, use Figure 6 The structure shown measures the reading when the empty container 7 and the standard B9 coexist, and by adjusting the standard B9, the reading when the empty container 7 and the standard B9 coexist is U BC Equal to U AThe common load value W of a certain property of the empty container 7 and the standard object B9 is BC The load value W of a certain property of standard object A8 A Equal, that is: ......(d) Also because W BC It includes the load value of a certain attribute of the empty container and the load value of a certain attribute of the standard object B9, namely: ......(e) From equations (d) and (e), we can get: ......(f) From (c) and (f) we can get: ......(g) In formulas (d), (e), (f), and (g): W BC —The load value of a certain attribute when an empty container and a standard object B coexist; W A —The load value of a certain attribute of the standard object A as a whole; W C —Load value of a certain attribute of an empty container; W2—the loading value of a certain attribute in the second part of the artificially assumed standard object A; W B —Load value of a certain attribute of standard object B; That is, after removing the portion of standard object A8 that is artificially assumed to have the same attribute load value as that of the empty container, the remaining portion, that is, the attribute load value of the artificially assumed portion 215, is equal to the attribute load value of standard object B9.

[0045] like Figure 11 As shown, the signal emitted by the signal transmitting unit 1 first passes through the artificially assumed part 14 in the standard object A8. At this time, the signal is affected by the part 14 to form a new signal. It is assumed that the new signal can be received and a reading is obtained, and it is assumed that the reading is U A1 The signal continues to transmit through the artificially assumed part 2 15 in the standard A8. At this time, the signal is affected by the part 2 15 to form a second new signal. The second new signal is received by the signal receiving unit 2 and a reading is obtained. The reading is the U obtained in the above step. A According to the above analysis, the load value W1 of a certain attribute of the artificially assumed part 14 is different from the load value W of the attribute of the empty container 7. C If they are equal, then U A1In fact, it is the signal emitted by the signal transmitting unit 1. After passing through the empty container, if it can be received and obtained normally, it is the "zero point value" of the empty container: ......(h) This value is the "zero point value" of the artificially assumed portion 15 of the standard A8 as the signal continues to transmit through it. That is, the following relationship exists: ......(i) Substituting (g) into equation (g), we obtain: ......(j) In formulas (h), (i), and (j): U A1 —The signal emitted by the signal transmitting unit is transmitted through the artificially assumed part 1 of the standard object A and is assumed to be received and obtained as a reading; U C —Zero data value for empty container; W2—the loading value of a certain attribute in the second part of the artificially assumed standard object A; U A —The signal emitted by the signal transmitting unit passes through the standard object A and is received and read by the signal receiving unit; W B —Load value of a certain attribute of standard object B; (j)W B and U A If all are known, then U can be calculated A1 , and then the required "zero point" data value U of the empty container can be obtained by formula (h) C .

[0046] In the above steps, the load data W of a certain property of the standard object B9 can be obtained. B , and the data is one-to-one corresponding to the corresponding empty container 7. That is, different empty containers, after the standard object B9 that meets the requirements is determined through the "device initialization step" in the above steps, the load data W of a certain attribute of the standard object B9 B Therefore, if there are multiple empty containers, you only need to use the "device initialization step" in the above steps for each container in advance to obtain the W corresponding to each empty container. B Data, and then record and save the data corresponding to the empty container. When using different containers, call the W corresponding to the currently used container. B The data is then subjected to zero point calibration calculation to conveniently obtain the "zero point" data value of the container currently in use.

[0047] The present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims to which the present invention is subject.

Claims

1. A zero point calibration device for a transmission type measuring instrument with a container, characterized in that: include: A standard object A is installed; a standard object B is installed; the placement positions of the standard objects A and B are located between the signal transmitting unit and the signal receiving unit of the measuring instrument, and are located within the signal area. The signal emitted by the signal transmitting unit passes through the standard objects A and B and is received by the signal receiving unit; the standard objects A and B are objects that can affect the measurement signal of this transmission measuring instrument and thus change the reading of the signal receiving unit. They can be solids, liquids or gases loaded in containers, liquids or gases injected into the placement position, and other substances; the standard objects can be moved out of the signal area and placed in the placement position by a manual or mechanical drive mechanism; the characteristic of standard object A is that when it is placed alone in the signal area, the signal emitted by the signal transmitting unit passes through the standard object A and reaches the signal receiving unit. The signal strength is neither too low nor too high, and can adapt to the receiving capacity of the signal receiving unit, so that the signal receiving unit can correctly collect the reading. Let the reading be U A The characteristic of standard object B is that when an empty container and standard object B are placed in the signal area at the same time, and there are no other objects in the signal area, the signal emitted by the signal transmitting unit penetrates the empty container and standard object B to reach the signal receiving unit, and the signal strength is neither too low nor too high, which can adapt to the receiving capacity of the signal receiving unit, so that the signal receiving unit can correctly collect the reading, and the reading value obtained at this time is equal to the aforementioned U A When there are no other objects in the signal area, the standard object A is moved into the signal area by a manual or mechanical driving mechanism, the signal receiving unit reads the signal, and the signal processing unit processes it to obtain the reading U when the standard object A exists alone A When only standard object A is in the signal area, standard object B is moved into the signal area by a manual or mechanical driving mechanism, and the signal receiving unit reads the signal, which is processed by the signal processing unit to obtain the reading U when standard objects A and B are present at the same time. AB The signal processing unit of the measuring instrument uses the U A 、U AB The empty container zero point U of the instrument is calculated based on the calibration mathematical model when only an empty container exists. C .

2. The zero point calibration device for a transmission type measuring instrument with a container according to claim 1, characterized in that: The signal transmitting unit is an X-ray device, and the signal receiving unit is a crystal scintillation counter.

3. The zero point calibration device for a transmission type measuring instrument with a container according to claim 1, characterized in that: The signal transmitting unit is an X-ray device, and the signal receiving unit is an ionization chamber detector.

4. The zero point calibration device for a transmission type measuring instrument with a container according to claim 1, characterized in that: The mechanical drive mechanism is a pneumatic, hydraulic, electromagnetic or motor-driven drive.

5. The zero point calibration device for a transmission type measuring instrument with a container according to any one of claims 1 to 4, characterized in that: A limiting device is installed, and the calibration object is driven by a manual or mechanical driving mechanism to move or stop according to the limit of the limiting device.

6. A method for zero point calibration of a transmission type container measuring instrument, characterized in that: include: Device initialization step: When there are no other objects in the signal area, the standard object A is moved into the signal area by a manual or mechanical driving mechanism, the signal receiving unit reads the signal, and the signal processing unit processes the signal data U when the standard object A exists alone. A The standard object A is moved out of the signal area by a manual or mechanical driving mechanism, and the empty container and the standard object B are moved into the signal area by a manual or mechanical driving mechanism. The signal receiving unit reads the signal, and the signal processing unit processes the signal data obtained when the empty container and the standard object B coexist. The characteristics of the standard object B, such as material, external dimensions, etc., are adjusted. The above steps of reading the signal data when the empty container and the standard object B coexist and adjusting the characteristics of the standard object B are repeated until the value of the signal data is equal to U A , at this time, the standard object B is determined; the measurement steps of the standard object B are: when there are no other objects in the signal area, the standard objects A and B are moved into the signal area by a manual or mechanical driving mechanism, the signal receiving unit reads the signal, and the signal processing unit processes it to obtain the signal data U when the standard objects A and B coexist. AB； Data calculation and storage step: The signal processing unit of the measuring instrument uses the signal data U when the standard A exists alone A , signal data U when standard A and standard B coexist AB Calculate the load value W of a certain attribute of the standard object according to the calculation mathematical model B , W B Save for later use; Zero point calibration steps: When zero point calibration is required, when there are no other objects in the signal area, the standard object A is moved into the signal area by a manual or mechanical drive mechanism, the signal receiving unit reads the signal, and the signal processing unit processes the signal to obtain the new measurement signal data U when the standard object A exists alone. A新 , calculate the zero point data U of the empty container according to the calibration mathematical model C .

7. The method for zero-point calibration of a transmission measuring instrument according to claim 6, characterized in that: The mathematical model for its calculation is: The basic mathematical relationship of this transmission measurement is known (1): , where W t —The load value of a certain property of the object being measured by this measuring instrument; U0—the zero point signal data of the measuring instrument; U t —Measurement signal data of measuring instrument; A 、U AB Substituting the above relationship into the mathematical relationship (2): , where W B —The load value of a certain property of the standard object B; U A —Measurement signal data when standard substance A exists alone; U AB —Measurement signal data when standard substance A and standard substance B coexist.

8. The method for zero-point calibration of a transmission measuring instrument according to claim 7, characterized in that: The calibration mathematical model is: W B 、U A新 Substituting into mathematical relation (1) we obtain mathematical relation (3): , where W B —The load value of a certain property of the standard object B; U A新 —New measurement signal data when standard substance A exists alone; U C —Empty container zero point data; where W B It has been measured, calculated and saved through the above steps and is known; U A新 It is obtained by measuring in this step, and the empty container zero point data U can be calculated through mathematical relationship (3) C , which is the zero point value that needs to be obtained in the current zero point calibration step.

9. The method for zero-point calibration of a transmission-type measuring instrument according to claim 6, wherein: The initialization steps of the device are as follows: when there are no other objects in the signal area, the standard object A is moved into the signal area by a manual or mechanical drive mechanism, and the signal receiving unit reads the signal. Within the measurement time t1, multiple (N1) signal data are read, which are recorded as: , calculate the signal data U when the standard substance A exists alone using the following formula A : The standard object A is moved out of the signal area by a manual or mechanical driving mechanism, and the empty container and the standard object B are moved into the signal area by a manual or mechanical driving mechanism. The signal receiving unit reads the signal, and multiple (N2) signal data are read within the measurement time t2, which is recorded as: Calculate the reading U when the standard B9 and the empty container 7 coexist using the following formula: BC : .

10. The method for zero-point calibration of a transmission measuring instrument according to claim 6, wherein: The measurement steps of the standard object B are as follows: when there are no other objects in the signal area, the standard objects A and B are moved into the signal area by a manual or mechanical driving mechanism, and the signal receiving unit reads the signal. Within the measurement time t3, multiple (N3) signal data are read, which are recorded as: Calculate the reading U when standard A8 and standard B9 coexist using the following formula: AB : .

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