201243292 六、發明說明： 【發明所屬之技術領域] 本發明係關於-種音又式 物料性質變化，自動調㈣饋置幻日種可依據 定U饋頻率門檻 測裝置與方法。 \ θ又式感 【先前技術】 現有音又式物液位開關（音 化與桶埚^ α τ - 式感測裝置）主要應用於 化子桶槽、艮口口工業、石油化輋繁 佶用Β* β λ-. 產業之物液位量測控制， 使用日守，疋經由驅動—壓電元 # , ^ ^ 5 ^ ^ ^ 41 * 而使一曰又產生共振頻 手’虽晋又觸及物料時，舍祛立 Μ回饋—個頻率訊號，經 由计异其頻率的變化來判斷物料深度，然而，如圖7所干， 由於不同比重之物料反應出的訊號不"量 物料時在音又共振凹槽的會有 θ有不冋的感應頻率變化，為確 保對應不同比重物料能夠正確在立 啼啦θ又共振凹槽感應動作， 一般採用比重為1的皮傲盔I +么心 的水做為基本參考點，再配合動作門檻 調整單元’能夠在測量不同物料時調調整動作門檻頻率值 至以達到Sensing Point都能維持在相同的音又共振凹槽感 測點位置動作。 當物料比重等於-標準比重時(通常為水），音又70上 的感測點位置等於標準感測位置S0,當物料比重大於標準 比重時’音又7G上的感測點位置S1將低於該標準感測位 置so’當物料比重小於標準比重時，音叉7〇上的感測點 位置S2將高於該標準感測位置S()，故μ㈣μ㈣ 中谷、’内物料的不同比重以手動方式重新調整頻率門檻 (quency Thresho丨d) ’以確保物液位到達同一標準感測 201243292 2置時回饋1關訊號。已知技術顯示其便利性不足，且 里測準確度與輸出穩定性低，因此有進一步改良的必要： 美國a間第（JS2006/0053863A1號專利案已揭露如何 利用β斷方式來判斷適合作為驅動的振盪部分，此種設計方 式除了針對振盪的部份做診斷外並沒有將不同物料比重所 造成的影響列入考慮，這可能使桶槽内物料不同時容易失去 其感測點的準確性。 【發明内容】 有鑒於前述問題，本發明主要目的在提供一種自動調整 頻率門檻與檢測點之音叉式感測裝置與方法，主要是在感測 點的判斷做了自我調整的動作，並透過不斷地更新音又的訊 號以判別物料比重，藉此使感測點位置不會因為物料不同而 產生變動，進而保持量測之準確性及提高輸出穩定性。 為達成前述目的採取的主要技術手段係令前述自動調 整頻率門檻與補償（Offset)調整感測點之音叉式感測裝置包 含一音又本體及一信號處理模組；其中，該信號處理模組 包括： 一壓電元件’係與音叉本體接觸； 一信號處理電路，主要係由一濾波器及一放大器所組 成，§亥濾波器接收壓電元件送出的感測信號後送至放大器 作放大處理，並送回壓電元件； 一微處理器，具有一個以上的輸入端及一個以上的輸 出端，其輸入端經一類比數位轉換器與信號處理電路的輸 出端連接；該微處理器内建有一待測物值比重與音又共振凹 201243292 槽頻率補償的函式眘4 式貪枓及一動作門檻調整單元，該動作門檻 調整單元係提供— 頻率門松（Frequency Threshold)參考 點t、U處理器作為判斷的依據； 、』=感測裝置係在塵電元件共振後產生—感測信號， 並送至k號處理電路中的、·磨、士怒、办μ μ 电塔甲的濾波器濾除雜訊及放大器作放大 處理後，再送至翻（·(·献±* 、數位轉換器轉換為數位形式的時脈信 號’又經過信號虚？々士 處電路處理後的信號除送至微處理器 外，亦回授至壓雷亓杜.木μ ★ 牛，S U處理器收到該時脈信號後， 將計算出一對應的音叉j£ # ，古 日又/、振頻率，當料槽内的物料與音又 接觸後，將產生不同的j£ & #古1 J ^八振頻率並送回微處理器，藉此， 微處理器可以取得該妓振瓶专 、搌頻率的斜率，並利用斜率換算出 料槽内物料的比重，再柄姑娜老 丹根據U處理益内建的待測物值比重 與音又共振凹槽頻率補儅的$斗、次丨丨Μ 補1貝的函式貢料對動作門檻調整單元 頻率提供的門檻初始值進杆舖彳營 ％ , ^ 、 ^仃補乜，藉此可在物料接觸音又 上相同的感測點位置時由輪ψ | 田翰出電路送出開關訊號。利用前 述裝置可以自動判斷物料的比番， 重進而自動補償修正頻率 門檻，使料位的判斷更，準確穩定。 前述自動調整頻率門檀與檢測點之音又式感測裝置，苴 壓電元件包含-個以上的壓電片組合、一壓電元件驅動電 路及一壓電信號接收電路。 前述的自動調整頻率門檻與檢測點之音又 置，其中所述的濾波器係為—帶通濾波器。 〜、我 本發明又一目的在提供-種自動調整頻_盘感測 點之方法，主要係令-微處理器執行下列步驟，其包A :201243292 VI. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a change in the nature of a material, and automatically adjusts (4) the feed of the magical day according to the fixed U-fed frequency threshold detecting device and method. \ θ-style sense [prior art] The existing sound and liquid level switch (sound and barrel 埚^ α τ - type sensing device) is mainly used in the chemical tank, the mouth and mouth industry, the petrochemical industry Use Β*β λ-. The measurement of the liquid level measurement of the industry, using the Japanese Guardian, 疋 via the drive-piezoelectric element # , ^ ^ 5 ^ ^ ^ 41 * When the material is touched, the frequency signal is used to judge the material depth by counting the change of the frequency. However, as shown in Figure 7, the signal reflected by the material of different specific gravity is not The sound and the resonant groove will have an inductive frequency change of θ. In order to ensure that the material corresponding to different specific gravity can be correctly operated in the vertical θ and the resonant groove, the Pylon helmet with a specific gravity of 1 is generally used. The water is used as the basic reference point, and the action threshold adjustment unit can adjust the action threshold frequency to measure the different materials until the Sensing Point can maintain the same sound and the resonant groove sensing point position. When the material specific gravity is equal to the standard specific gravity (usually water), the position of the sensing point on the tone 70 is equal to the standard sensing position S0, and when the material specific gravity is greater than the standard specific gravity, the sensing point position S1 on the 7G will be low. When the material specific gravity is less than the standard specific gravity, the sensing point position S2 on the tuning fork 7〇 will be higher than the standard sensing position S(), so μ(four)μ(4) The method re-adjusts the frequency threshold (quency Thresho丨d) 'to ensure that the liquid level reaches the same standard sensing 201243292 2 when the signal is returned to the 1 signal. The known technology shows that its convenience is insufficient, and the accuracy of measurement and output stability are low, so there is a need for further improvement: US Patent No. (JS2006/0053863A1 has disclosed how to use β-break mode to judge suitable as a drive. In the oscillating part, this design method does not take into account the influence of the specific gravity of the material except for the diagnosis of the oscillating part, which may make it difficult to lose the accuracy of the sensing point when the materials in the tank are different. SUMMARY OF THE INVENTION In view of the foregoing problems, the main object of the present invention is to provide a tuning fork sensing device and method for automatically adjusting a frequency threshold and a detection point, mainly performing self-adjusting actions on the judgment of sensing points, and continuously The signal is updated to determine the specific gravity of the material, so that the position of the sensing point does not change due to different materials, thereby maintaining the accuracy of the measurement and improving the output stability. The main technical means for achieving the above purpose are The tuning fork sensing device that automatically adjusts the frequency threshold and offsets the sensing point includes a tone The main body and a signal processing module; wherein the signal processing module comprises: a piezoelectric element 'contacting the tuning fork body; a signal processing circuit mainly composed of a filter and an amplifier; The sensing signal sent by the piezoelectric element is sent to the amplifier for amplification processing and sent back to the piezoelectric element; a microprocessor having more than one input terminal and more than one output terminal, the input end of which is passed through an analog-to-digital converter Connected to the output end of the signal processing circuit; the microprocessor has a built-in value of the object to be measured and the acoustic resonance concave 201243292 groove frequency compensation function of the type 4 greedy and an action threshold adjustment unit, the action threshold adjustment unit Provides - Frequency Threshold reference point t, U processor as the basis for judgment; 』 = sensing device is generated after the resonance of the dust cell component - sense signal, and sent to the k processing circuit, ·Mill, anger, and μ μ The filter of the electric tower filter filters out the noise and the amplifier is amplified, and then sent to the turn (·(··±±, the digital converter is converted into a number The form of the clock signal 'has passed the signal virtual? The signal processed by the gentleman's circuit is sent to the microprocessor, and is also sent back to the pressure Thunder Du Mumu ★ cow, the SU processor receives the clock signal After that, a corresponding tuning fork j£ # will be calculated, and the frequency of the ancient day and the vibration frequency will be different when the material in the trough is in contact with the sound, and a different j £ &#古1 J ^ eight vibration frequency will be generated. Returning to the microprocessor, the microprocessor can obtain the slope of the frequency and the frequency of the vibrating bottle, and use the slope to calculate the specific gravity of the material in the trough, and then the handle is built by the U Na The weight of the object to be measured and the sound and the resonance groove frequency complement the $ bucket, the second 丨丨Μ 补 1 贝 贡 对 对 对 对 对 对 对 对 对 对 对 对 对 对 对 对 对 对 对 对 对 动作 动作 动作 动作 动作 动作 动作 动作^仃补乜, by which the switch signal can be sent by the rim | Tian Han output circuit when the material contact sound is on the same sensing point position. The above device can automatically judge the ratio of materials, and then automatically compensate for the correction frequency threshold, so that the judgment of the material level is more accurate and stable. The above-mentioned automatic adjusting frequency gate and the detecting point sound-sensing device, the piezoelectric element comprises more than one piezoelectric chip combination, a piezoelectric element driving circuit and a piezoelectric signal receiving circuit. The aforementioned automatic frequency adjustment threshold and the sound of the detection point are set again, wherein the filter is a band pass filter. ~, I Another object of the present invention is to provide a method for automatically adjusting the frequency _ disk sensing point, mainly to the microprocessor - the following steps, the package A:
讀取一輸入的頻率門檻參考點； S 5 201243292 取得音叉機電共振時回傳的感測頻率值； 比較遠頻率門檀參考點與感測頻率值； 當感測頻率值小於頻率門檻參考點時，輸出一第一控制 訊號；反之，感測頻率值不小於頻率門檻參考點，則輸出一 第二控制訊號； 重複前述步驟。 本發明利用所提供的自動調整頻率門檻與檢測點之音 叉式感測裝置與方法，可以獲得的具體效益為： 本發明的微處理器能依物料比重對音又共振頻率進行 偏移補償，使比重不同的物料有相同的感測位置，使用上 更加簡便’且提高量測準减度與輸出穩定性。 而與美國公開第US2006/0053863A1號專利案比較， 本發 US2006/0053863A1 旧 ，J既弟6 · 本發明 感測點門檻 (Sensing Point Threshold) 固定偵測輸出判斷 採用可調整頻率 門檻 增加量測準墟,Η： 感測點位置 (Sensing Point) 未做調整 不同比重動作點 調整 提高輸出穩定性 【實施方式】 為能詳細瞭解本發明的技術特徵及實用功效，並可依 照說明書的内容來實施，茲進一步以如圖示較佳實施例， 詳細說明如后： 本發明所提供的自動調整頻率門檻與檢測點之音叉式 感測裝置的一較佳實施例，首先請參閱圖1、圖2所示，其 201243292 包含一音叉10及一信號處理模組20，該音又1〇上具有一 感測位置S ;該信號處理模組2 0包括一壓電元件21、一作 號處理電路22、一微處理器23及一輸出電路24。 該壓電元件21主要與音又1〇接觸；請參閱圖3所示， 上述的壓電元件21包含一個以上的壓電片組合211、—壓 電元件驅動電路21 2及一壓電信號接收電路21 3，主要係 由壓電元件驅動電路212使壓電片組合211形變產生共 振，為一個弦波訊號，壓電片組合211中主要材料為壓電薄 膜。該壓電信號接收電路213除接收弦波訊號外還包含訊號 處理電路’接收訊號後將送至信號處理電路22 ; 仍請參閱圖2所示，該信號處理電路22主要係由一帶 通濾波器221及一放大器222所組成，其中帶通濾波器221 的輸入端係與前述壓電信號接收電路213的輸出端連接，放 大器222的輸入端及輸出端則分別與帶通濾波器22，的輸 出端及壓電το件21的輸人端連接，又放大器222的輸出端 另經由一類比數位轉換器223與微處理器23的輸入端及壓 電元件驅動電路212的輸入端連接。 請參閱圖4所示’該微處理器23主要係由—微控單元 231、-動作門檻調整單元232 & —二線式輸出控制電路 233所組成，其中微控單元231内建有—待測物值比重與音 又共振凹槽頻率補償的函式資料，且微控單元231係透過前 述類^數位轉換n 223與信號處理電路22的輸出端連接。 «壓電7L件接收電路213將感測的弦波訊號送至信號 :理電路22,將先由帶通滤波器221將雜訊排除，接著由 敌大裔222把訊號放大，再透過類比數位轉換器223進行 201243292 類比數位轉換以取得一個時脈（c丨〇ck)訊號，再送至微處理器 23由微處理器23計算出對應的音又共振頻率，由於微處 理=23㈣有待測物值比重與音又共振凹槽頻率補償的函 式負料，以根據計算出的音又共振頻率與動作門檻調整單元 232輸入的頻率門檻參考點作比對，進而據以輸出電路μ 的輸出。另外，除了將訊號傳至微處理器23外，放大器222 的輸出訊號也會回授至壓電元件21㈣電元件驅動電路 212 〇 而微處理器23的訊號判斷流程係如圖5，首先讀取動 作門檻調整單A 232輸人的頻率門檻（F「equencyThf_esh〇|d) 參考點Fref(501)，X摘測音又機電共振時回傳的◦丨〇ck訊 號頻率值FSen(502)，再進—步比較該頻率門檻參考點 與音又鑑頻取得的感測頻率M Fsen(5Q3)，當感測頻率值 「咖小於頻率門檻參考點_時，則輸出—[控制訊號 (Output.ON)(5G4)，反之則輸出__第二控制訊號（〇叫北 〇FF)(5G5)，隨後重複前述步驟以持續對音又訊號做鑑頻動 作0 再者，微處理H 23㈣的待測物值比重與音又共振凹 槽頻率補償的函式資料，可由如圖6所示的共㈣率與伸人 物料深度關係圖得出。該函式資料則可以是多項式、指數型 式、拋物線型式、線性函式或查詢表。 由上述可#纟發明利用前述裝置可以自動判斷物料 的比重，it而自動補償修正頻率門檻，能將各種比重物料 於音又10的感測位置調整至相同位置，使用上更加簡便， 且使料位的判斷更趨準確穩定。 201243292 作任何形式上的限制 任何所屬技術領域中具有通常知識Read an input frequency threshold reference point; S 5 201243292 Get the sensed frequency value returned by the tuning fork electromechanical resonance; compare the far frequency gate reference point and the sensed frequency value; when the sensed frequency value is less than the frequency threshold reference point And outputting a first control signal; otherwise, if the sensing frequency value is not less than the frequency threshold reference point, outputting a second control signal; repeating the foregoing steps. The invention utilizes the provided tuning fork sensing device and method for automatically adjusting the frequency threshold and the detection point, and the specific benefits that can be obtained are: The microprocessor of the invention can offset the sound and the resonance frequency according to the specific gravity of the material, so that Materials with different specific gravities have the same sensing position, which is easier to use and improves the accuracy and output stability. Compared with the US Patent Publication No. US2006/0053863A1, the present invention is US2006/0053863A1, and the other is the younger brother. 6 · The Sensing Point Threshold fixed detection output is judged by the adjustable frequency threshold increase amount. Market, Η: Sensing Point No adjustment of different specific gravity action point adjustment to improve output stability [Embodiment] In order to understand the technical features and practical effects of the present invention in detail, and in accordance with the contents of the specification, Further, a preferred embodiment of the tuning fork sensing device for automatically adjusting the frequency threshold and the detecting point provided by the present invention is further described in the preferred embodiment of the present invention. Referring first to FIG. 1 and FIG. 2 In addition, the 201243292 includes a tuning fork 10 and a signal processing module 20, and the sound has a sensing position S on the first side; the signal processing module 20 includes a piezoelectric element 21, a processing circuit 22, and a Microprocessor 23 and an output circuit 24. The piezoelectric element 21 is mainly in contact with the sound. Referring to FIG. 3, the piezoelectric element 21 includes one or more piezoelectric sheet assemblies 211, a piezoelectric element driving circuit 21 2, and a piezoelectric signal receiving. The circuit 21 3 is mainly composed of a piezoelectric element driving circuit 212 for deforming the piezoelectric sheet assembly 211 to generate a sine wave signal, and the main material of the piezoelectric sheet assembly 211 is a piezoelectric film. The piezoelectric signal receiving circuit 213, in addition to receiving the sine wave signal, further includes a signal processing circuit 'received signal, which is sent to the signal processing circuit 22; still see FIG. 2, the signal processing circuit 22 is mainly composed of a band pass filter. 221 and an amplifier 222, wherein the input end of the band pass filter 221 is connected to the output end of the piezoelectric signal receiving circuit 213, and the input end and the output end of the amplifier 222 are respectively connected to the output of the band pass filter 22. The input terminal of the terminal and the piezoelectric device 21 is connected, and the output terminal of the amplifier 222 is further connected to the input terminal of the microprocessor 23 and the input terminal of the piezoelectric element drive circuit 212 via an analog-to-digital converter 223. Referring to FIG. 4, the microprocessor 23 is mainly composed of a micro control unit 231, an action threshold adjustment unit 232 & a two-wire output control circuit 233, wherein the micro control unit 231 has a built-in The measured value is proportional to the sound and the resonant groove frequency compensation function, and the micro control unit 231 is connected to the output end of the signal processing circuit 22 through the aforementioned analog bit conversion n 223. «The piezoelectric 7L receiving circuit 213 sends the sensed sine wave signal to the signal: the circuit 22 will first remove the noise by the band pass filter 221, then the signal is amplified by the enemy 222, and then transmitted through the analog digital The converter 223 performs the 201243292 analog-to-digital conversion to obtain a clock (c丨〇ck) signal, and then sends it to the microprocessor 23 to calculate the corresponding tone and resonance frequency by the microprocessor 23, since the micro-processing = 23 (4) has a sample to be tested The value of the specific gravity and the resonant cavity frequency compensation function is compared with the calculated frequency and resonant frequency and the frequency threshold reference point input by the motion threshold adjusting unit 232, and then the output of the output circuit μ is obtained. In addition, in addition to transmitting the signal to the microprocessor 23, the output signal of the amplifier 222 is fed back to the piezoelectric element 21 (four) the electric component driving circuit 212, and the signal judging process of the microprocessor 23 is as shown in FIG. The action threshold adjusts the frequency threshold of the single A 232 input (F "equencyThf_esh〇|d) reference point Fref (501), X picks up the measured sound and the ◦丨〇ck signal frequency value Fsen (502) returned by electromechanical resonance, and then Step-by-step comparison of the sensing frequency M Fsen (5Q3) obtained by the frequency threshold reference point and the sound frequency, and when the sensing frequency value "Caf is less than the frequency threshold reference point _, then output - [Control signal (Output.ON) ) (5G4), otherwise, output __ second control signal (〇 〇 Bei FF) (5G5), then repeat the above steps to continue to discriminate the sound and signal 0 again, micro-processing H 23 (four) to be tested The function data of the specific value of the object value and the compensation of the frequency of the resonant groove can be obtained by the relationship between the total (four) rate and the depth of the material shown in Fig. 6. The data of the function can be polynomial, exponential type or parabolic type. , linear function or lookup table. The device can automatically determine the specific gravity of the material, and automatically compensate the correction frequency threshold. It can adjust the various specific gravity materials to the same position in the sensing position of the sound 10, which is more convenient to use and makes the judgment of the material level more accurate and stable. 201243292 Any form of limitation has general knowledge in any technical field
特徵的範圍内。 以上所述，僅疋本發明的較佳實施例，並非對本發明 【圖式簡單說明】 圖1係本發明一較佳實施例之音又示意圖。 圖2係本發明一較佳實施例之電路方塊圖。 圖3係本發明一較佳實施例之壓電元件方塊圖。 圖4係本發明一較佳實施例之微處理器方塊圖。 圖5係本發明一較佳實施例之工作流程圖。 圖6係本發明一較佳實施例之函式資料特性曲緣 圖7係既有音又之感測位置示意圖。 【主要元件符號說明】 1〇音又 2 0信號處理模組 21壓電元件 211壓電片組合 212壓電元件驅動電路 21 3壓電信號接收電路 22信號處理電路 221濾波器 222放大器 23微處理器 2 2 3類比數位轉換器 231微控單元 201243292 232動作門檻調整單元 233二線式輸出控制電路 24輸出電路 70音叉 10Within the scope of the feature. The above is a preferred embodiment of the present invention, and is not intended to illustrate the invention. FIG. 1 is a schematic diagram of a preferred embodiment of the present invention. 2 is a block diagram of a circuit in accordance with a preferred embodiment of the present invention. Figure 3 is a block diagram of a piezoelectric element in accordance with a preferred embodiment of the present invention. 4 is a block diagram of a microprocessor in accordance with a preferred embodiment of the present invention. Figure 5 is a flow chart showing the operation of a preferred embodiment of the present invention. Figure 6 is a schematic diagram of a functional data edge of a preferred embodiment of the present invention. Figure 7 is a schematic diagram of both the sound and the sensed position. [Main component symbol description] 1 Arpeggio 20 Signal processing module 21 Piezoelectric element 211 Piezoelectric plate assembly 212 Piezoelectric element driving circuit 21 3 Piece signal receiving circuit 22 Signal processing circuit 221 Filter 222 Amplifier 23 Micro processing 2 2 3 analog digital converter 231 micro control unit 201243292 232 action threshold adjustment unit 233 two-wire output control circuit 24 output circuit 70 tuning fork 10