DLP NANO 文件保存参数请教

zyslqr

Shift Vector Coefficients:	-13.1183	0.080631	-0.00011
Pixel to Wavelength Coefficients:	1819.63	-0.92552	-0.00023

请问，上面参数的具体含义是什么，是DLP NANO光谱模块保存的文件里面的信息。

9 年多前

0 Jeremy_Wu 9 年多前

TI__Mastermind 30820 points

在DLPspec_types.h和DLP Spectrum Library中有定义.存储calibration系数的.

#define NUM_PIXEL_NM_COEFFS PX_TO_LAMBDA_NUM_POL_COEFF
#define NUM_SHIFT_VECTOR_COEFFS PX_TO_LAMBDA_NUM_POL_COEFF

/**
* @brief Contains calibration coefficients generated by calibrating a spectrometer.
*
* Stores the polynomial coefficients used when relating pixels to wavelengths
* and for bending patterns to correct for mechanical tolerances which cause
* slit image rotation on the DMD array and optical distortions which cause
* curvature due to the out of plane angles on the grating. These coefficients
* are generated during calibration and should be stored in non-volitile
* protected memory in each spectrometer.
*/

typedef struct
{
double ShiftVectorCoeffs[NUM_SHIFT_VECTOR_COEFFS];
double PixelToWavelengthCoeffs[NUM_PIXEL_NM_COEFFS];
}calibCoeffs;

0 zyslqr 9 年多前回复 Jeremy_Wu

Prodigy 40 points

您好，谢谢。

请问有具体的多项式公式，或者在程序哪里看到，请指教，谢谢。

0 Jeremy_Wu 9 年多前回复 zyslqr

TI__Mastermind 30820 points

参考dlpspec_calib.c

DLPSPEC_ERR_CODE dlpspec_calib_genPxToPyCoeffs(const int num_peaks, const double *px_measured, const double *py_measured, double*px_to_py_coeffs, double *rsquared)
/**
* Finds a second order polynomial that fits the given x and y input values and returs the three co-efficients for that polynomial
*
* @param[in] num_peaks Number of points in @p *px_measured and @p *py_measured
* @param[in] px_measured Pointer to the pixel peak locations. This should be
* @param[in] py_measured Pointer to the 6 nanometer values
* @param[out] px_to_py_coeffs Pointer to the computed polynomial coefficients in the following order c, b, a which should be used to compute any given y value as
* y = ax2 + bx + c
* @param[out] rsquared Pointer to r squared coefficient of determination for the derrived 2nd order equation.
*
* @return number of peaks found in the input data set
* <0 Error codes as DLPSPEC_ERR_CODE
*
*/

DLPSPEC_ERR_CODE dlpspec_calib_genPxyToCurveCoeffs(const double *peaks, const double *y_values, const int num_peaks, const int num_measurements, double *pxy_to_curve_coeffs)
/**
* This function computes the polynomial coefficients using DMD row used for measurement and corresponding peak location
* These coefficients can then be used to compute the shift during pattern generation
*
* @param[in] peaks Pointer to the pixel peak locations on top, middle & bottom of DMD (ordered with peaks closest to the centre column of DMD first and the farthest from centre as the last)
* @param[in] num_measurements Number of measurements taken; typically 3, one on top, middle and bottom of DMD
* @param[in] num_peaks number of peaks measured
* @param[in] y_values y values correspoding to each set of measurements
* @param[out] pxy_to_curve_coeffs Pointer to the computed polynomial coefficients in the following order c, b, a which
* should be used to compute any given y value as y = ax2 + bx + c
*
* @return Error codes
*/

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DLP NANO 文件保存参数请教