Sensor accuracy

Figure 4-230 shows the photograph of a Develco high-temperature directional sensor. For all the sensor packages, calibration data taken at 25, 75, 125, 150, 175 and 200°C are provided. Computer modeling coefficients provide sensor accuracy of 0.001 G and 0.1° alignment from 0 to 175°C. From 175 to 200°C the sensor accuracy is 0.003 G and 0.1° alignment. 

These results should be contrasted with the situation with sensors that were implanted over 30 days. The lag in these devices rose to 15-30 min. There was also a decline in sensitivity of the sensors to glucose, sensor accuracy, and the degree of closed-loop glycemic control.4 Based on the known effects and time course of collagen deposition that occurs as part of the foreign body reaction,12 13 it is very likely that this decline in sensor function was a direct result of this process. The effect of the foreign body reaction on the function of biosensors has been comprehensively reviewed by Wisniewski and colleagues.14 15... 

Figure 3.2 The effect of prolonged subcutaneous implantation on biosensor function. Blood glucose values shown in solid circles and glucose sensor values in the continuous lines. The early study (top panel), but not the late study (bottom), shows excellent sensor accuracy and minimal lag between blood glucose and sensed glucose values. MARD (mean absolute relative difference) refers to a sensor accuracy metric. EGA refers to the Clarke error grid analysis accuracy metric.

Enzyme biosensors containing pol3mieric electron transfer systems have been studied for more than a decade. One of the earlier systems was first reported by Degani and Heller [1,2] using electron transfer relays to improve electrochemical assay of substrates. Soon after Okamoto, Skotheim, Hale and co-workers reported various flexible polymeric electron transfer systems appUed to amperometric enz5une biosensors [3-16], Heller and co-workers further developed a concept of wired amperometric enzyme electrodes [17—27] to increase sensor accuracy and stability. 

Calculated starting from the sensor accuracies reported in reference [3]... 

To improve the fuel vapor-pressure sensor accuracy, we reduced the mechanical strain conveyed from the package to the sensor device. Fig. 7.3.14 shows the structure of the fuel vapor-pressure sensor for 5 kPa. We chose a relatively thin silicon diaphragm, 14 pm, to achieve the sensitivity required for 5 kPa detection. That makes the sensor device more susceptible to the mechanical strain conveyed from the resin package. To solve that problem, we analyzed the effect of the mechanical strain from the package by FEM. 

Loading and displacement rates System compliance - horizontal and vertical Sensor accuracy and precision Equipment calibration Scratch length... 

Sensor accuracy describes the closeness of agreement between a measured value and a true value of the measurand (concentration of analyte or refractive index). Sensor accuracy is usually expressed in absolute terms or as a percentage of the error/output ratio. 

An average value of 9.17 mW cm was determined for qy,z,t at this position. The predicted value by the ESSDE model at the same position was 9.29, 1.3% higher from the measured value. This eiTor is well below the sensor accuracy of 5%, which validates the applicability of the model for the simulation of the radiation field in an empty reactor. Besides the determination of the radiative flux spatial distribution, the energetic and spatial distributions of the radiative flux, qn,z,x,t, can be determined by spectroradiometric measurements in the LTU (Chapter III). 

Equipment Scan method Wavelength [nm] Angle accuracy ["] Distance accuracy [mm] Dual-axis sensor accuracy ["]... 

Lack of verticality of the main axis and colhmation axis B/Rectangular uccx = where i is the dual-axis sensor accuracy... 

Lightning Direct strike Damage to aircraft nose or pitot-static ports can impact sensor accuracy Unlikely to impact both side in identical manner, but note that Captain s primary display and the standby display are fed from port side pitot statics ... 

By increasing both sample mass and sensitivity, the signal is increased over traditional DSC sensors. Accuracy and precision of the Cp determination are l%-3% versus 7%-15% for traditional DSC. 

The metrology for AXAF mirror blanks was designed for measurement on the grinding CNC machine. Diameter and surface runout measurements were made by a contactless triangulation sensor. Accuracies of 0.03 mm for the diameter and surface runout measurements were obtained. The in-situ measurements on the grinding machine, without removal of the mirror blank from the machine table, were feasible due to calibration of the machine coordinates with Zerodur low-expansion rods. 

Calibration of Velocity Sensors by Stepwise Motion The main idea behind this method is to (1) move the sensor to a known distance (like 1 mm) in its direction of sensitivity, (2) record the signal, and (3) correct the signal for the known displacement frequency response (response function relating sensor output to displacement) to get the displacement. Theoretically, the displacement is now calculated, which can be compared to the actual displacement, from which the generator constant can be calculated. The method is described in detail by Wielandt in chapter MEMS Sensors for Measurement of Structure Seismic Response and Their Application in NMSOP (Bormann 2002), which claims that the method works well for broadband sensors (accuracy down to 1 %) and even 10 Hz seismometers. Although the method sounds simple, it is not trivial to correct for the instrument response down to DC, particularly for SP instruments. 

Kovatchev B (2015) Assessing sensor accuracy for non-adjunct use of continuous glucose monitoring. Diabetes Technol Ther 17(3) 1-10... 

The non-invasive requirement for the hot leg temperature sensor must therefore be evaluated against impacts on reactor control response time. Other factors affecting sensor placement include sensor accuracy and resolution, temperature tolerance, sensor size, and feasible attachment methodologies. The sensor technologies under consideration for measuring the hot gas temperature were ultrasonics, thermocouples, resistance temperature deviees (RTDs), optical pyrometry, and fiber Bragg grating. 

A4.3.S.1 Components and variables involved are (a) average grab size, (b) flow sensor-to-controller link, (c) controller, (d) controller-to-probe link, (e) probe operation, and (/) flow sensor accuracy. 

A5.4.3 Flow Sensor Accuracy (SA)— The volume as measured by the sampler(s) flow sensor(s) is normally not available. The volume measured by the flow sensor(s) is calculated fiom the number of grabs ordered by the control-ler(s). 

Valve Position Sensor 2 In multiple-loop SNPP architectures with 2 or more Brayton machines, valves are used to direct coolant flow appropriately. Sensing of valve position is necessary for monitoring and control of these valves. For each valve a discrete fixed position sensor is required to be active (asserted) when the valve is in its SHUT position. Othervnse It Is inactive (deasserted). Photo, proximity, and microswitch technologies are typically applied as discrete position sensors. Accuracy and resolution values for the sensor of 0.1% of point and 0.01% of point and a response of 0.001 seconds are typical of these technologies. 

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