TWI730889B - Method for detecting the water content in the liquid to be measured by infrared rays - Google Patents

Abstract

The invention is provided with an oil pipe, an infrared light transmitter, an infrared light receiver and a processing unit. The oil pipe circulates a liquid to be tested, and is provided for the corresponding penetrating settings of the infrared light transmitter and the infrared light receiver. When the infrared light emitter emits an infrared light, its wavelength range is between 900nm~902.5nm, and the infrared light penetrates the liquid to be tested and reaches the infrared light receiver; the processing unit reads the infrared light reception according to the plural sampling time The voltage signal of the device and the multiple voltage signals can be calculated as a sum of values. It is then used to calculate the optical parameters of the liquid to be tested. Each optical parameter corresponds to a specific water content. The complex optical parameters constitute a basic data. It is used to compare the optical parameters of a test liquid with unknown water content to obtain its water content. It also has the advantages of real-time detection of the water content of the lubricating oil to improve lubrication efficiency, modularization can be directly applied to related devices, remote monitoring of most of them in line with industrial benefits, and infrared detection to reduce external interference.

Description

Method for detecting the water content in the liquid to be measured by infrared rays

The present invention relates to a method for detecting the water content in a liquid to be measured by infrared rays, especially a method that can detect the water content of lubricating oil in real time and improve the lubrication efficiency. The modularization can be directly applied to related devices and can perform remote monitoring It is in line with industrial benefits and infrared detection reduces external interference. It is a method of infrared detection of water content in the liquid to be tested.

In the past, machine equipment or instruments, such as the lubricating oil replacement index of internal combustion engine systems or gear bearings, were replaced by the use time or mileage of the operating stroke. Such replacement indicators may be replaced prematurely (the lubricating oil may be Not yet degraded), resulting in unnecessary cost waste, but if it is replaced too late (the offline mode detection cannot obtain the result immediately), it may cause the machine to increase wear (damage). Generally, testing equipment is expensive, and the lubricant sample needs to be brought back to the testing room for testing. This is an offline mode testing device. You must wait for a considerable amount of testing time to know the status of the lubricant, which is both inconvenient and time-consuming. In view of this, it is necessary to develop a technology that can solve the above-mentioned conventional shortcomings.

The purpose of the present invention is to provide a method for detecting the water content of the liquid to be measured by infrared rays, which can detect the water content of the lubricating oil in real time and improve the lubrication efficiency. Monitoring is in line with industrial benefits, and infrared detection reduces external interference. In particular, the problem to be solved by the present invention is that the general testing equipment is expensive and the lubricant sample needs to be brought back to the testing room for testing. This is an off-line mode testing device. You must wait for a considerable testing time to know the status of the lubricant. , Both inconvenience and time-consuming. The technical means to solve the above problems is to provide a method for detecting the water content in the liquid to be measured by infrared rays, which includes the following steps: 1. Preparation steps; 2. Steps for obtaining the sum of values; 3. Calculation steps of optical parameters; 4. Steps for obtaining basic data of different water content; and Five, detection steps. The above-mentioned objects and advantages of the present invention can be easily understood from the detailed description of the following selected embodiments and the accompanying drawings. Hereinafter, the present invention will be described in detail with the following examples and drawings:

(公式1)； 其中，n=取樣個數，在本案實施例為2000(個)； V _i=電壓訊號，即V ₁、V ₂、…、V _n(單位=伏特)； ΔT=取樣時間，即T ₁、T ₂、…、T _n(單位=秒)。 三、光學參數計算步驟S3：該數值總和(S)係供該處理部40計算該待測液91之一光學參數，其係由下列之公式2所定義：

(公式2)； 其中，C=權數、λ=紅外線波長、S=數值總和、ν=待測液運動黏度、n=電壓訊號之取樣數量、T ₁=待測液溫度、T ₀=外界溫度；其中該ν係指該待測液91在40 ℃下之黏度，其單位為cSt；且C=0.5。 四、不同含水量之基礎資料取得步驟S4：先以複數不同含水量之該待測液91，依序分別進行該數值總合之取得步驟S2與該光學參數計算步驟S3，而得到複數光學參數，該複數待測液91的其中之一係為含水量100%之純水，並將對應該含水量100%之純水的光學參數當成100，而其餘不同含水量之該待測液91之光學參數，則依比例分別計算，進而得到一基礎數據(如第4圖所示)。 五、檢測步驟S5：對一未知含水量之待測液91進行檢測，計算出其光學參數，將此計算得到之光學參數與該基礎數據進行比對，即可得出相對應之含水量。 當然，以第4圖所示之基礎數據為例，若對一未知含水量之待測液91進行檢測，計算出其光學參數為84.2，其係介於代表含水量94.8%的光學參數85.6，以及代表含水量92.4%之光學參數82.8之間，以傳統之內插法可推知其含水量為93.6%。同樣的，也可用外插法推知光學參數低於62.0之情況。由於內插法或外插法均為已知技術，在此不詳述其細節。 實務上，該待測液91可為切削油、研磨油、…、循環油其中一者。 該處理部40可連接雲端裝置(公知技術，圖面未示)，進而可進行遠端即時監控。 關於本發明之使用方式，係在預先建立該基礎數據後，將該油管10之該入口11與該出口12分別連通至一機台油槽(具有該待測液91)內(如第2圖所示)，使得該通道13內充滿該待測液91。啟動該紅外光發射器20、該紅外光接收器30及該處理部40。使得處理部40依取樣時間，開始記錄測量該紅外光接受器30之電壓訊號；進而將擷取到之該電壓訊號進行計算，最後可得到該待測液91之光學參數。 關於數值總合之計算方式，茲舉一例說明如下： 以1秒取樣4次(即獲得4個點)為例，取樣時間(ΔT)=1/4s= 0.25s=250 ms。而本案採用取樣2000點，即持續取樣500秒可以得到2000個取樣值(n=2000)。 更詳細的說，每一次取樣時間會得到一電壓訊號。2000次取樣可得到2000筆電壓訊號(例如：V ₁、V ₂、. . .V _n)。 以下列之公式(1)可以計算出數值總和(S)： S=

(公式1)； 其中，n=取樣個數，在本案實施例為2000(個)； V _i=電壓訊號，即V ₁、V ₂、…、V _n(單位=伏特)； ΔT=取樣時間，即T ₁、T ₂、…、T _n(單位=秒)。 例如，參閱第3圖，其中： 第一點(V ₁)=

V(伏特)； 第二點(V ₂)=

V(伏特)。 其可以下列計算方式得到：

； 之後的第三點、第四點、…、第N點(V _n)可依此類推計算。 最後得到2000點總和=數值總和(S)。 關於光學參數之計算，以純水為例：

；

。 本發明之重點在於，潤滑劑(液、油)在產業上是一個不可或缺的存在，若有適當潤滑保養，可使機台長時間高效率運轉，以達到減少磨耗與磨損之成效。但一般檢測儀器價格昂貴，若能以一般光學模組檢測，將可以方便又快速的檢測及保養，達到便利性及節省成本之效益。 本發明利用紅外線較不易受環境影響干擾之特性，即時檢測工具機切削油含水量變化，可預防過早或過慢更換之影響後果，並可以解決線上與遠端監控之問題。 本發明之優點及功效係如下所述： [1] 可即時檢測潤滑油之含水量提高潤滑效益。本發明可直接裝設於相關之機台油槽，進而即時檢測使用中之潤滑油之含水量，隨時有異常隨時警示，可提高潤滑效益。故，可即時檢測潤滑油之含水量提高潤滑效益。 [2] 模組化可直接應用於相關裝置。本發明為模組化設計，可裝設於未出廠之機台油槽，亦可另外加設於現有之相關裝置。故，模組化可直接應用於相關裝置。 [3] 可進行遠端多數監控符合產業效益。本發明可以該處理部連結雲端裝置，達成複數機台油槽同步監控者。故，可進行遠端多數監控符合產業效益。 [4] 紅外線檢測減少外界干擾。本發明利用紅外線較不易受環境影響干擾之特性，進行檢測。故，紅外線檢測減少外界干擾。 以上僅是藉由較佳實施例詳細說明本發明，對於該實施例所做的任何簡單修改與變化，皆不脫離本發明之精神與範圍。 Referring to Figures 1 and 2, the present invention is a method for detecting water content in a liquid to be measured by infrared rays, which includes the following steps: 1. Preparation step S1: prepare an oil pipe 10, an infrared light emitter 20, and an infrared The optical receiver 30 and a processing unit 40. The oil pipe 10 has an inlet 11, an outlet 12, and a passage 13, and the passage 13 is connected to the inlet 11 and the outlet 12; the oil pipe 10 is used to contain a liquid to be measured 91 of the water content to be measured; the infrared light emission The device 20 is used to emit an infrared light L, which can penetrate at least one of the channel 13 and the liquid to be tested 91, and reach the infrared light receiver 30; the wavelength range of the infrared light L is Between 900nm~902.5nm. The processing unit 40 is electrically connected to the infrared light emitter 20 and the infrared light receiver 30. 2. Obtaining the sum of values Step S2: Referring to Fig. 3, within a time range of the infrared light L penetrating the channel 13 and the liquid to be tested 91, the processing unit 40 samples every other sampling time (for example: T ₁ , T ₂ ,..., T _n ) means to read the voltage signal of the infrared light receiver 30 to obtain the complex voltage signal (for example: V ₁ , V ₂ ,..., V _n ), the number of which is defined as n; Then use the following formula (1) to calculate a numerical sum (S): S=

(Formula 1); Among them, n=sampling number, 2000 (units) in the embodiment of this case; V _i = voltage signal, namely V ₁ , V ₂ ,..., V _n (unit = volt); ΔT = sampling time , Namely T ₁ , T ₂ , ..., T _n (unit = second). 3. Optical parameter calculation step S3: The numerical sum (S) is for the processing unit 40 to calculate an optical parameter of the test liquid 91, which is defined by the following formula 2:

(Formula 2); Among them, C=weight, λ=infrared wavelength, S=sum of values, ν=kinematic viscosity of the liquid to be tested, n=sample number of voltage signal, T ₁ = temperature of the liquid to be tested, T ₀ = external temperature ; Wherein the ν refers to the viscosity of the test liquid 91 at 40 ℃, the unit is cSt; and C=0.5. 4. Acquiring basic data of different water content Step S4: First, take a plurality of different water contents of the liquid to be tested 91, and perform the numerical summing obtaining step S2 and the optical parameter calculation step S3 in sequence to obtain the complex optical parameters One of the plurality of test liquids 91 is pure water with a water content of 100%, and the optical parameters of the pure water corresponding to 100% of the water content are regarded as 100, and the other test liquids 91 with different water contents are The optical parameters are calculated separately in proportion to obtain a basic data (as shown in Figure 4). 5. Detection step S5: Detect an unknown water content of the liquid 91 to be tested, calculate its optical parameters, and compare the calculated optical parameters with the basic data to obtain the corresponding water content. Of course, taking the basic data shown in Figure 4 as an example, if a test liquid 91 with unknown water content is detected, its optical parameter is calculated to be 84.2, which is between the optical parameter 85.6 which represents 94.8% of water content. And the optical parameter 82.8, which represents 92.4% of water content, can be inferred to have a water content of 93.6% by the traditional interpolation method. Similarly, the extrapolation method can also be used to infer the case where the optical parameters are lower than 62.0. Since both the interpolation method and the extrapolation method are known techniques, the details are not described in detail here. In practice, the test fluid 91 can be one of cutting oil, grinding oil, ..., circulating oil. The processing unit 40 can be connected to a cloud device (known technology, not shown in the figure), and can perform remote real-time monitoring. Regarding the use of the present invention, after the basic data is established in advance, the inlet 11 and the outlet 12 of the oil pipe 10 are respectively connected to a machine oil tank (with the liquid to be tested 91) (as shown in Figure 2) Show), so that the channel 13 is filled with the liquid to be tested 91. The infrared light transmitter 20, the infrared light receiver 30, and the processing unit 40 are activated. The processing unit 40 starts to record and measure the voltage signal of the infrared light receiver 30 according to the sampling time, and then calculates the captured voltage signal, and finally obtains the optical parameters of the liquid to be tested 91. Regarding the calculation method of the total value, an example is given as follows: Take 4 samples per second (that is, 4 points are obtained) as an example, the sampling time (ΔT)=1/4s= 0.25s=250 ms. In this case, 2000 sampling points are used, that is, 2000 sampling values can be obtained by continuous sampling for 500 seconds (n=2000). In more detail, a voltage signal is obtained every sampling time. 2000 samples can get 2000 voltage signals (for example: V ₁ , V ₂ ,... V _n ). The sum of values (S) can be calculated by the following formula (1): S=

(Formula 1); Among them, n=sampling number, in the embodiment of this case 2000 (units); V _i = voltage signal, namely V ₁ , V ₂ ,..., V _n (unit = volt); ΔT = sampling time , Namely T ₁ , T ₂ , ..., T _n (unit = second). For example, refer to Figure 3, where: The first point (V ₁ )=

V(Volt); The second point (V ₂ )=

V (Volt). It can be obtained by the following calculation methods:

; The third point, the fourth point, ..., the Nth point (V _n ) afterwards can be calculated by analogy. Finally, the sum of 2000 points = the sum of values (S). Regarding the calculation of optical parameters, take pure water as an example:

；

. The key point of the present invention is that lubricant (liquid, oil) is an indispensable existence in the industry. If proper lubrication and maintenance are provided, the machine can be operated with high efficiency for a long time to achieve the effect of reducing wear and abrasion. However, the general detection equipment is expensive. If the general optical module can be used for detection, it will be convenient and fast to detect and maintain, achieving convenience and cost-saving benefits. The invention utilizes the characteristic that infrared rays are less susceptible to environmental influences to detect the change in water content of machine tool cutting oil in real time, can prevent the effects of premature or slow replacement, and can solve the problem of online and remote monitoring. The advantages and effects of the present invention are as follows: [1] The water content of lubricating oil can be detected immediately to improve the lubrication efficiency. The invention can be directly installed in the oil tank of the relevant machine, and then the water content of the lubricating oil in use can be detected immediately, and abnormalities can be alerted at any time, which can improve the lubrication efficiency. Therefore, the water content of the lubricating oil can be detected immediately to improve the lubrication efficiency. [2] Modularization can be directly applied to related devices. The present invention is a modular design, which can be installed in the oil tank of a machine that has not been shipped from the factory, or can be additionally installed in existing related devices. Therefore, modularization can be directly applied to related devices. [3] It is in line with industry benefits to be able to perform remote monitoring of most of them. In the present invention, the processing unit can be connected to the cloud device to achieve simultaneous monitoring of the oil tanks of a plurality of machines. Therefore, it is in line with industrial benefits to be able to perform remote monitoring. [4] Infrared detection reduces external interference. The invention utilizes the characteristic that infrared rays are less susceptible to interference from environmental influences for detection. Therefore, infrared detection reduces external interference. The above is only a detailed description of the present invention with a preferred embodiment, and any simple modifications and changes made to the embodiment will not depart from the spirit and scope of the present invention.

10: Oil pipe 11: Inlet 12: Outlet 13: Channel 20: Infrared light transmitter 30: Infrared light receiver 40: Processing part 91: Liquid to be tested L: Infrared light V ₁ , V ₂ , V _n : Voltage signal S1: Preparatory step S2: Obtain the sum of numerical values Step S3: Calculation of optical parameters Step S4: Obtain basic data of different water content Step S5: Detection step

Figure 1 is a flowchart of the detection method of the present invention Figure 2 is a schematic diagram of the main device of the present invention Figure 3 is a schematic diagram of the corresponding relationship between the complex sampling time and the voltage signal of the present invention Figure 4 is a bar graph of the correspondence between optical parameters and water content of the present invention

S1: Preparation steps

S2: Steps to obtain the sum of values

S3: Optical parameter calculation steps

S4: Steps to obtain basic data for different water content

S5: Detection steps

Claims (3)

A method for detecting water content in a liquid to be measured by infrared rays includes: 1. Preparation steps: preparing an oil pipe, an infrared light emitter, an infrared light receiver and a processing unit; the oil pipe has an inlet, an outlet, and A channel, the channel is connected to the inlet and the outlet; the oil pipe is used to contain a liquid to be tested for water content, the infrared light emitter is used to emit an infrared light, and the infrared light can penetrate the channel At least one of the liquid to be tested reaches the infrared light receiver; the wavelength range of the infrared light is between 900nm~902.5nm, and the processing part is electrically connected to the infrared light emitter and the infrared light receiver. 2. Steps for obtaining the sum of values: within a time range of the infrared light penetrating the channel and the liquid to be tested, the processing unit reads the voltage signal of the infrared light receiver every sampling time to obtain The number of the complex voltage signal is defined as n; then use the following formula (1) to calculate a numerical sum (S): S=

(Formula 1); Among them, n=the number of samples; V _i =voltage signal; ΔT=sampling time; 3. Optical parameter calculation steps: the numerical sum (S) is for the processing unit to calculate an optical The parameters are defined by the following formula 2:

(Formula 2); Among them, C=weight; λ=infrared wavelength; S=sum of values; ν=kinematic viscosity of the liquid to be measured; n=sample number of voltage signal; T ₁ =temperature of the liquid to be measured; T ₀ =outer temperature ; Wherein ν refers to the viscosity of the test liquid at 40 ℃, and its unit is cSt; and C=0.5; 4. Steps to obtain basic data of different water contents: first use plural different water contents of the test liquid, Perform the step of obtaining the sum of the values and the step of calculating the optical parameters respectively in order to obtain complex optical parameters. One of the plurality of test liquids is pure water with a water content of 100%, and will correspond to a water content of 100 The optical parameter of% pure water is regarded as 100, and the other optical parameters of the test liquid with different water content are calculated separately according to the proportion, and then a basic data is obtained; 5. Detection steps: for a test liquid with unknown water content Perform detection, calculate its optical parameters, and compare the calculated optical parameters with the basic data to get the corresponding water content. The method for detecting water content in a liquid to be measured by infrared rays as described in claim 1, wherein the liquid to be measured is one of cutting oil, grinding oil, and circulating oil. The method for detecting water content in a liquid to be tested by infrared rays as described in claim 1, wherein the processing unit is used to connect to a cloud device for remote real-time monitoring.

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