CN108458768B

CN108458768B - Method for rapidly and accurately measuring volume of irregular object

Info

Publication number: CN108458768B
Application number: CN201810732767.1A
Authority: CN
Inventors: 李珈语; 刘浩
Original assignee: Wuhan Deyi Environmental Technology Co ltd
Current assignee: Wuhan Deyi Environmental Technology Co ltd
Priority date: 2018-07-05
Filing date: 2018-07-05
Publication date: 2020-06-09
Anticipated expiration: 2038-07-05
Also published as: CN108458768A

Abstract

The invention discloses a method for quickly and accurately measuring the volume of an irregular object, which comprises the following steps: 1) selecting an injector; 2) injecting clear water into the injector, enabling the needle head to be vertically upward, and discharging air through the needle head; 3) withdrawing the syringe piston, and sealing the front end of the syringe by using a rubber cap before withdrawing; 4) taking down the syringe piston, and placing the object to be detected into the syringe barrel; 5) closing the syringe piston, replacing the rubber cap at the top end of the syringe with a needle head, and exhausting air; 6) according to the scale of the piston, the top end of the pipette is sealed by a rubber cap, and the needle head of the injector is inserted into the rubber cap at the top end of the pipette and enters the pipette; 7) erecting the syringe and pipette composite, pushing the piston, and pushing the piston to the mark; 8) and the volume of clear water in the pipette is the volume of the measured object. The method is simple, convenient and quick to operate, has high accuracy, and can be used in field biological and ecological environment conditions very conveniently.

Description

Method for rapidly and accurately measuring volume of irregular object

Technical Field

The invention relates to the technical field of measurement, in particular to a method for quickly and accurately measuring the volume of a small irregular object by a drainage method. The method is particularly suitable for rapidly and accurately measuring the volume of irregular living materials such as plant leaves, fruits and the like in the field biological and ecological investigation.

Background

The volume is an important characteristic quantity of the object, various measuring methods are available, and various calculation formulas can be used for regular objects. However, the volume of the irregular object is still relatively complicated to measure quickly, and the measurement of the volume of the irregular object by using a drainage method is the simplest method, and generally a large object is measured. The development of modern computer three-dimensional reconstruction techniques also provides a mature technique for irregular object volume measurement, but the required equipment limits the use of this technique in a large number of field operations. In particular, in investigations involving field biology and ecology, rapid measurement of a large number of irregular, different-texture natural objects is an almost unachievable task, and thus the volume of a subject is hardly a measure of these investigations.

Currently, in biological and ecological field investigation work, only the length, width, height (or thickness), weight and the like of involved irregular objects such as leaves and fruits are generally measured by using standard measuring tools. No volume is generally determined. One reason is that these living materials tend to be morphologically diverse and cannot be measured by conventional measurement means, and on the other hand, because these materials tend to be lighter than water and are difficult to measure conveniently by drainage methods.

Disclosure of Invention

In order to solve the problems in the measurement of the volume of the irregular object, the invention aims to provide a method for quickly and accurately measuring the volume of the irregular object by using a drainage method, which has the advantages of simple, convenient and quick operation, high accuracy and very convenient use in the field biological and ecological environment conditions.

In order to achieve the purpose, the invention adopts the following technical measures:

a method for rapidly and accurately measuring the volume of an irregular object comprises the following steps:

1. a syringe (common) with a certain specification is selected and comprises a needle.

In actual research work, the matching of a 50ml syringe with a 1ml or 2ml pipette can meet the needs of most cases.

2. The syringe is filled with clean water (tap water), air is removed by pressing the following method, the needle head is vertically upwards, the syringe is flicked by fingers, and meanwhile, the piston is slowly pushed, the air is discharged through the needle head, and the condition that the maximum scale position of the syringe is accurately filled with the clean water is ensured. Take a 50ml syringe as an example, and fill up with 50ml of clean water.

3. The syringe piston is slowly withdrawn, and the front end of the syringe is sealed by a rubber cap before being withdrawn, so that the clear water is prevented from dripping and leaking.

4. And taking down the syringe piston, and placing the object to be detected into the syringe barrel.

5. The syringe piston is closed, and the rubber cap at the top end of the syringe is replaced by the needle. The needle head is upward, and air is preliminarily exhausted according to the method in the step (2);

6. according to the scale of the piston at the moment, selecting a pipette (common) with corresponding specification: taking a 50ml syringe as an example, if the scale of the piston is less than 1ml beyond the 50ml standard scale mark, a 1ml glass pipette is selected, and if the scale of the piston is within the range of 1-2 ml beyond the standard scale mark, a 2ml glass pipette is selected. The pipette tip was closed with a rubber cap and the syringe needle was inserted into the pipette tip through the rubber cap.

7. And (3) standing the syringe and pipette complex vertically, pushing the piston, and removing residual air and liquid in the syringe according to the step (2) of the conventional method until the piston reaches the mark of the specification of the syringe. Taking a 50ml syringe as an example, the plunger is pushed to the 50ml mark.

8. The volume of clear water in the pipette is the volume of the object to be measured. The volume measurement precision can reach 0.01cm by using a 1ml standard pipette³。

Through the technical measures, the key point of the invention is that the constraint of the injector on the object to be measured is skillfully utilized, and the volume can be accurately measured by utilizing a drainage method no matter whether the object to be measured can float on the water surface or not. The measured volume was determined to be consistent with the calculated volume by examination with standard size wood blocks (1X 1 cm; 0.5X 0.5cm) and glass marbles (diameter 1 cm).

In the field biological and ecological investigation, the invention is non-destructive to the measurement of the volume of the living organism, and the material to be measured can also be used for measuring other indexes. For example, after the volume of the blade is measured, the blade can be used for measuring indexes such as length, width, thickness, chlorophyll content and the like, and each measurement index can be measured on the same measurement object.

Compared with the prior art, the invention has the following advantages and effects:

1. the method is simple and convenient, and the used articles are products with various unified standard specifications and can be flexibly selected according to the requirements.

2. The method has high accuracy of the measurement result, and the accuracy of the method depends on the accuracy of the pipette.

3. The method has no selectivity to the texture of the object to be measured, and can be used for measuring both sinking and floating.

4. The method has high measuring efficiency, and a large number of volume values can be quickly obtained without special training.

Detailed Description

Example 1:

1. a syringe (common glass syringe) with a certain specification is selected and comprises a needle. In actual research work, the matching of a 50ml syringe with a 1ml or 2ml pipette can meet the needs of most cases.

2. Clean water (tap water) is injected into the injector, and air is removed according to a conventional use method: the syringe is flicked by fingers with the needle head upward, and the piston is slowly pushed to discharge air, so that the maximum scale position of the syringe is accurately filled with clear water. Take a 50ml syringe as an example, and fill up with 50ml of clean water.

4. Taking down the syringe piston, putting the object to be tested into the syringe barrel, closing the piston, replacing the rubber cap with the needle head, and preliminarily discharging air according to the step (2) of the method.

5. According to the amount of the top of the piston exceeding the standard scale mark, a pipette with a certain specification is selected: taking a 50ml syringe as an example, if the scale of the piston is less than 1ml beyond the 50ml standard scale mark, a 1ml glass pipette is selected, and if the scale of the piston is within the range of 1-2 ml beyond the standard scale mark, a 2ml glass pipette is selected. The tip is closed with a rubber cap and the syringe needle is inserted into the pipette tip through the rubber cap and into the pipette.

6. And (3) standing the syringe and pipette complex, continuously pushing the piston, and removing air and liquid in the syringe according to the step (2) of the conventional method until the piston reaches the mark of the specification of the syringe. Taking a 50ml syringe as an example, the plunger is pushed to the 50ml mark.

7. The volume of clear water in the pipette is the volume of the object to be measured.

The method has high measurement precision on the volume of the object to be measured, and the precision can reach 0.01cm3 by taking the volume measurement of a 1ml standard pipette as an example.

The invention carries out nondestructive sampling on the object to be detected; the invention can be used for realizing accurate and rapid determination of the volume no matter whether the specific gravity of the object to be measured is greater than that of water or not.

Claims

1. A method for rapidly and accurately measuring the volume of irregular leaves or wood blocks comprises the following steps:

1) selecting an injector with a certain specification: in the investigation work, a 50ml specification syringe is used with a 1ml or 2ml pipette;

2) injecting clear water into the injector, removing air according to a conventional use method, enabling the needle head to be vertically upward, flicking the injector by fingers, simultaneously pushing the piston, and discharging the air through the needle head, wherein the clear water accurately fills the maximum scale of the injector;

3) slowly withdrawing the syringe piston, and sealing the front end of the syringe by using a rubber cap before withdrawing to prevent the clear water from dripping;

4) taking down the syringe piston, and putting the blade or the wood block to be tested into the syringe barrel;

5) closing the syringe piston, replacing the rubber cap at the top end of the syringe with a needle head, enabling the needle head to face upwards, and exhausting air according to a conventional method;

6) selecting a pipette with corresponding specification according to the scale of the piston, selecting a 1ml glass pipette when the scale of the piston exceeds 50ml standard scale mark and is less than 1ml, selecting a 2ml glass pipette when the scale of the piston exceeds 50ml standard scale mark and is within the range of 1-2 ml, sealing the top end of the pipette by using a rubber cap, and inserting a syringe needle into the rubber cap at the top end of the pipette to enter the pipette;

7) erecting the syringe and pipette composite, pushing the piston, removing residual air and liquid in the syringe by a conventional method until the piston reaches the mark of the specification of the syringe, and pushing the piston to the mark of 50 ml;

8) and the volume of clear water in the pipette is the volume of the measured leaf or wood block.